Naked With My Sister

Naked With My Sister

This is my entry in the Literotica 2025 Nude Day Story Contest. If you enjoy the story, please remember to vote by clicking on the stars at the end of the final page.

This is a brother/sister romance story. If that's not your thing, you've been warned. It's a work of fiction, and all characters are over the age of eighteen.

Thanks as always to neuroparenthetical for his superb editing.

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My parents are... unpredictable. They enjoy doing things on a whim, off the cuff, spur of the moment. One July evening they called to ask if I would stay with my kid sister for the following week. They'd arranged a vacation trip at the last minute, but didn't really want to leave her home alone. I couldn't be there until Monday, since I had plans with friends, but I said I could stay at the house from Monday through the following Saturday.

I'm Sean; my kid sister is Mia. At the time of my folks' last-minute vacation, I was a student at the local college, between my junior and senior years. My sister Mia was eighteen, fresh out of high school, and totally unsure of what she wanted to do next. The thing about Mia is that she's brilliant. She wasn't unsure in a dopey kind of way; she had a full-ride STEM scholarship. The "problem" was that she had so many options. The truth is that she's always intimidated me. As the oldest sibling, I want to think I'm also the smartest, but she holds that title.

Now, a lot of guys assume that "intelligent" equals anything but "hot babe." At one time, I'd felt the same. I also hadn't given Mia so much as a second look, but that should hardly come as a surprise. To try to be objective about it in hindsight, much of her physical appearance was and remains statistically average: she's slender, but not skinny; athletic, but not muscular; and attractive, but not supermodel gorgeous. She's 5'4", and I'd guess she's a C cup.

If you'd asked me that weekend what my type was, well, I probably would've described somebody like Mia's best friend, Janice.

MONDAY

On my first day of my babysitting duty, Janice stopped in for a visit. She was on the high school volleyball team and stood a shade over six feet tall. Being 6'4" myself, I've always had a thing for tall girls, especially ones as pretty as her. I'd gone to some high school volleyball games just to see her in those cute, tight shorts they wear.

The girls were in the living room, and I stayed in the kitchen while they chatted about girl stuff like hair and makeup. Our open floor plan meant that while I was technically in another room, there were no walls between us. I was surfing the web on my laptop, and although I could hear them talking, I wasn't listening. That changed when my ears picked up a certain word: "nudist."

Janice was saying that she had relatives who always went to a nude resort about that time every year for some sort of annual "Nude Day." I looked over at Mia; she was wide-eyed, hanging on every word Janice said. Neither of them noticed that I was paying attention, or that I was just as interested as Mia seemed to be.

Mia asked if Janice had ever gone to the nude resort. "Are you kidding?" she replied. "Go naked in front of people? I feel the same way as my parents: that's just perverted. Nudists are a bunch of voyeurs and exhibitionists, and we don't do stuff like that."

I was immediately suspicious. Something in her tone made me wonder if she wasn't trying too hard to convince someone—maybe Mia, perhaps herself.

"Wouldn't you kind of like to see a bunch of guys with their things hanging out?" Mia asked quietly. "I mean, all those cocks, just flopping around—maybe a few big, hard ones."

"Mia! You little slut! You'd like that, wouldn't you?" Janice was laughing as she said it.

"Umm, yeah! I've only seen one hard penis, and that was Owen's. From what I know about penises, his wasn't very big." Out of the corner of my eye, I saw Mia glance over at me to make sure I wasn't listening. Fortunately, I'd been pretending to be engrossed in my laptop.

I guess I was pretending well enough. "It might not have been big," she whispered to Janice, "but it sure felt like it when he slipped it in."

The girls spent the evening giggling, texting friends, and reminiscing about high school. I spent the evening imagining Janice naked. I was positive she had at least considered nudism and had perhaps even tried it. The idea got stuck in my head, and I imagined going to a nude resort myself, displaying my nude body in public. I thought about how it would feel to have people look at my cock. That's all it took for my penis to start getting hard in a hurry. The fact that Janice was sitting right across the room made me even hornier. I secretly wished I could ask her if she would get naked with me.

Then a new idea popped into my head: that all three of us should spend the weekend celebrating Nude Day. I'd seen Mia in bikinis before, but never nude. As I looked at her, I imagined her naked bosoms, her nipples rising up from her areolas. I imagined seeing her pussy and wondered if she shaved it. I wasn't sure which would be sexier: Mia with a shaved cunt, or Mia with a blonde landing strip, directing miniature air traffic to her vulva. Either way would have been fine by me.

That night I went to bed early, leaving Mia and Janice giggling in the family room—and it wasn't because I was tired. When I climbed in my old bed, my dick was already halfway hard. I didn't typically sleep naked, but that night it seemed like the only viable option. After just a few strokes, I was at full mast.

I imagined my hand was actually Janice's. In my mind's eye, Mia was sitting on the edge of my bed, watching her friend stroke my cock. Janice was focused on my engorged manhood; Mia was making eye contact with me, biting her lower lip seductively. I imagined her groping her own exposed breasts as she watched, pinching and pulling her nipples.

I closed my eyes and let the fantasy play out. Mia used one hand to stimulate her tits and the other to massage her cunt, rubbing it up and down the valley between her pussy lips. In the real world, my cock was tingling like mad. My balls were already pulled up tight, and my orgasm was bubbling just beneath the surface. Fantasy Mia smiled, then lay down next to me and spread her legs, totally nude. She began masturbating in earnest, pushing herself to orgasm. I watched her rub her clit as her friend jerked me off. Somewhere along the way, my fantasy version of Janice had started masturbating as well, and all three of us were moaning in ecstasy.

By the time my real-life orgasm hit, I was actually thinking more about Mia than I was about Janice.

TUESDAY

The next morning, I awoke with thoughts of nudism still in my head. I couldn't recall the specifics of the dream I'd been having apart from the fact that my sister had been in it. Whatever or whoever else it had involved, it had given me a colossal case of morning wood.

I lay in bed for a while, waiting for my erection to go away, but it didn't want to deflate on its own. It was waiting for me to take care of it. I finally admitted that my dick was the boss at that moment and obliged. Kicking off my covers, I spread my legs and grabbed my hard cock with both hands.

Even though I knew I shouldn't, I decided to embrace my desire for Mia. I told myself that it was only imaginary, so it was okay. I didn't actually know what she looked like nude, but I filled in the blanks as best I could. I imagined her with slightly oval areolas, about two inches across, with firm, suckable nipples that stuck out about an inch from her boobs. Her inner labia protruded from her slit, and I could see pussy juice dripping out.

"Mmmmmm," I murmured quietly. "Oh, Mia." My hands traveled up and down my shaft, and every time my left hand got to my dick head, I rubbed my palm across the peak—right across the tiny hole at the tip. The fingers of my other hand found the groove between the shaft and head, and I twirled my penis as one might a champagne flute.

It wasn't long before I arched my back and ejaculated onto my stomach. I kept fucking myself as I came, coating my hands with my spunk, which I used as lube for the final strokes.

After I cleaned up, I headed for the kitchen to find something to eat. It had been a while since I'd lived at home, but I knew what foods were typically stocked. As expected, there was a box of chocolate-flavored kid's cereal. Mia was a huge fan of chocolate for breakfast.

As I was getting my morning sugar fix, Mia came into the kitchen. "Well, this brings back some memories. How you doin' bro? Just like old times."

I was a little embarrassed about having just masturbated while thinking of her, but reminded myself that unless she was psychic in addition to being smart there was no way she could know about it. "Yeah, It's pretty great. It was nice to see Janice last night."

Mia stopped what she was doing and turned to look at me. She didn't say anything right away; it was as if she was weighing her words or debating whether to say anything at all. Finally, she started speaking, slowly and deliberately. "You would not believe what she told me last night."

I grinned as I looked at her. "Actually, I have some idea."

"Were you listening to us? You prick." She didn't sound angry, though. "What did you hear?"

"Nothing much—just that she has relatives that are nudists."

It was Mia's turn to grin. "Nudists. Can you believe it?"

"Well, I don't know much about her relatives, so anything's possible. There is something else I've been wondering, though. Janice seemed to be a bit defensive about the whole thing. I'm wondering if she's been to a nudist place herself."

"Janice? A nudist? No way."

"Why not?" I asked. "Maybe she just enjoys... nature."

Mia had a quizzical look on her face. "What you just said—I don't get it. I mean, I enjoy nature, but I wouldn't enjoy being naked around people. They aren't the same thing."

"Depends on how you define 'nature.' And how do you know you wouldn't enjoy it? Have you ever tried it?"

She answered in that sing-songy way that meant the answer should be obvious. "No! And I'm not about to, either."

"I've never seriously considered it, but I can see the appeal." As casual as I tried to make it sound, it was already having an effect on my cock.

"You'd let people see your penis?"

"Look: if everyone else is nude, it would be odd to be clothed, don't you think? The fact that everyone would be wearing the same thing—nothing at all—shouldn't be an issue."

Mia had a look on her face that I recognized from when we were kids. I already knew what she was thinking, and what she was going to say. "If that's really how you feel," she said, "I dare you to go naked for the rest of the day."

That was what I'd figured. "Tell you what," I replied, "I will if you will."

Mia just stood and stared at me. "You can't be serious. I can't get naked with you; you're my brother."

"Okay, so you don't mind daring me to be naked, but you won't do it yourself? That sounds like you're chicken."

"That's not it! It's just... different. Girls have different parts than guys."

"Duh. Aren't you glad? I know I am. Come on, Mia. I saw your expression last night when Janice was talking about nudity. I know you want to do this."

"You don't fight fair. Give me a little time to get used to the idea."

It wasn't until that point that I became fully cognizant of what I was doing; I was attempting to get my sister's clothes off. I was conflicted; I thought about laughing it all off—to stop before things got out of control. I finally concluded that I'd leave it up to Mia and not push things further if she said no.

I poured a second bowl of chocolate-flavored cereal to accompany Mia's first. We changed the subject, talking about everything but social nudity. It was a strange breakfast, though. We kept exchanging glances that had unspoken significance.

That's how the remainder of the morning played out: Mia and I going about other activities—some of them pointless—while she was very obviously pondering the question of getting naked with me. Even though I could see her wheels turning, I'd pretty much assumed she'd made up her mind, and we wouldn't be shedding our clothes. I'll admit I was disappointed, but part of me was relieved.

It was nearly lunch time. I was about ready to go out for a burger when she came up behind me and said simply, "You can never tell anyone. I'm serious. Never, ever."

I was surprised but quickly decided to roll with it. "You got it. Our secret. But are you sure? I'm not trying to pressure you into anything."

"As long as this stays between us, I'm good with it. Besides, I'm betting you'll chicken out before I do."

I immediately thought of two things: Mia's tits, and the expression on her face when I showed her my cock. Both ideas were hot by themselves, but together they made for the most erotic scene I'd ever imagined. The extra taboo of it being my own sister—and of her seeing her brother's cock—made it even more exciting.

The two of us were each waiting for each other—waiting for the other one to make the first move, neither of us wanting to be the one to start things. After what seemed like minutes, but was probably only seconds, I started unbuttoning my shirt while our eyes remained locked on each other's.

After my shirt was off, I grinned at Mia. "Your turn." She was wearing a spaghetti strap tank top. She pulled it up over her head in one quick move, revealing a sheer lace bra. I could see her nipples through the material—like a teasing preview of things to come.

"That's all you get for now," she said. "My bra comes off when your pants come off." She stood looking at me with a smirk on her face. "Well, are you chicken?"

We were approaching the point of no return, but I couldn't back out. I'd seen enough to know I wanted to see more. I unbuckled my belt and let my jeans drop to the floor, leaving me in nothing but my boxers.

"Okay, Mia," I said, "time to put up or shut up. You have a choice: bra or shorts. All I've got left is boxers, so I'm letting you off easy. You'll still have a couple things left to take off after I'm totally nude. So, what's it gonna be?"

Mia laughed nervously. "You pick for me."

I think I was just as nervous as she was. "Umm, how about shorts? That'll leave you in your underwear. Deal?"

Mia nodded, then reached for her waist. She was wearing running shorts, so only the elastic waistband was holding them up. Blushing furiously, she pulled them down past her knees, then used her feet to pull them down to the floor, where she stepped out of them.

Under her running shorts were bikini panties—black, with white lettering on the crotch that said, "All You Can Eat." I chuckled when I read it, which made Mia look down. She'd apparently forgotten she'd worn that particular pair.

She laughed, put her hands over her crotch, and said, "Sorry, dude, but the buffet is closed. Now you go."

I'd been hoping for that moment ever since the previous night—actively fantasized about it, actually, and possibly even dreamed of it after that. Fantasy and reality aren't the same, though. I wasn't sure if I could actually go through with it. There wasn't any specific point when I made a decision; I couldn't even say for sure if I followed through more because I was a horny pervert or because Mia had started pushing other buttons. My hands pretty much worked on their own. My fingers hooked into my boxers and pulled them down. My penis was already quite hard, and when it was freed from its cotton prison, it sprung up, pointing at my sister.

Mia gasped, then quietly said, "It's so big."

It wasn't, really. I'm just a hair over six inches—not really insanely big—but apparently Mia was impressed, and I wasn't about to try to talk her out of it. I pushed my boxers down to my feet and kicked them off.

It was both exciting and weird to be naked in front of my sister. It was the first time I'd ever gotten naked with a woman purely for the sake of being nude rather than as a prelude to intercourse, and I loved it. I decided that I must have an exhibitionist streak. I didn't really want to let my sister know just how turned on I was, but my erection gave me away.

I gulped and motioned toward Mia. "Your turn. Which are you doing first: top or bottom?"

She didn't reply—not verbally, anyway. Instead, she reached back and unhooked her bra, but held it in place with one arm. She slithered out of it one arm at a time, all the while covering her bosoms with one arm or the other. She ended up topless, yet not having shown me anything.

"Come on now, Mia, that's cheating. Play fair."

"You rotten guy," she said, repeating a phrase she'd uttered a million times during our childhood.

"As I recall, you started it, challenging me to go naked. If you want to stop—if you're not brave enough—that's up to you, but it means you're the chicken."

She paused for a few moments. "Well, in for a penny, right?" Then she slowly lowered her arms, allowing me my first glimpse of her marvelous boobs, which were pretty much as I'd imagined. They were slightly paler than the rest of her torso, with large, dark areolas at the peak of each one. Her nipples were the reward at the center of each—like a prize for claiming the mountain top—and they were protruding by nearly an inch, hinting at her sexual excitement.

I stood in front of my nearly naked sister, admiring her breasts. My cock twitched at the sight, betraying my newfound desire for my sibling. I was embarrassed by my blatant arousal for someone I had no business lusting after, but my cravings were stronger, and I stood my ground, my eyes fixed on her body.

"Quit staring," she said abruptly. "If you want me to finish the job, you can't drool."

"Sorry, it's just that I've never seen such gorgeous tits." I figured a little flattery couldn't hurt, and at that moment, I really believed what I'd just said. "Do you want me to look away while you take off the bottoms?"

"Not necessary; just don't perv so much. Here goes." With that, she took off her bikini bottoms, allowing me to see the lunch bar she'd advertised on her panties. I'd previously pictured her pussy as either shaved or in a thin landing strip, but it was neither. Her hair was light blonde, which made it nearly transparent. It was trimmed into a small triangle, sitting just above her clit. Her inner labia protruded slightly from the vertical groove in her mound.

We were both nude. My penis was straining to reach her, twitching with arousal.

"Now what do we do?" she asked.

"I don't know. Whatever we'd do normally, I guess."

Normally, if I was naked with a beautiful, sexy woman, I'd take her in my arms, cover her in kisses, lay her down, and bury my cock in her cunt, but what we were doing was anything but normal. Instead of making love, we made lunch.

We both made an effort to be casual about the situation, starting with grilled cheese sandwiches—a favorite of hers. Cooking nude was a bit scary, but I figured as long as it wasn't anything that might spatter hot grease onto my penis, it was safe enough. After the first half hour or so, my dick settled down somewhat. I was still horny and semi-erect, but our shared nudity had stopped being completely weird—at least, that's how it felt for me.

That evening, we decided to watch a movie. I sat in the recliner, opposite the couch where Mia was. "Get over here next to me," she said. "If you're over there, you'll be staring at my tits all through the movie."

I moved to the couch, which ended up being a great idea. Mia slid over next to me and pressed her naked leg against mine, which made me wonder if her invitation had really been about preventing me—or her—from being a perv.

She'd been right about what I wanted; I kept trying to steal glances at the naked beauty sitting next to me, but feeling her warm thigh pressed against mine was an even bigger treat. With every breath, every heartbeat, I felt her subtle movements, her skin quietly caressing mine. I didn't really see much of the movie; I was distracted by two things: my nude sister and my hard cock.

After the movie ended, it was time for bed. Mia hesitated, as if she didn't want our naked night together to end just yet. For my part, I was unsure of what I wanted. I knew I couldn't ask her to do what I was thinking of doing. I fought the idea—tried to push it out of my mind—but gazing at her nude body made it difficult to think of anything else. I wanted to take her to my bed—to lie with her, to make love to her—but I knew that that would be inappropriate, to say the least.

Mia's hesitation led to nothing interesting or surprising. We said goodnight to each other and went to our respective rooms for the night.

My cock had been in various stages of arousal ever since we'd stripped for each other, and I desperately needed to cum. I lay on my bed and immediately began masturbating. One good thing about being nude was that I didn't need to waste time taking my clothes off. I took a handful of my comforter and used it like a pussy, thrusting my hard penis up into it. I pistoned my hips as I held the clump of blanket snugly around my manhood. With each thrust, I felt my mushroom head penetrating the ad hoc artificial cunt. While doing so, I closed my eyes and pictured my naked sister in all her real-life glory: her firm, young breasts and her neatly trimmed pussy. More than that, though, I imagined watching—staring, even. Then I imagined our eyes locking, our hands reaching for each other. As I stroked my shaft, I had her straddle me, riding my erect cock as I fucked her tight twat. It didn't take long for my dick to spew its load into my blanket. I pretended I was ejaculating deep inside her pussy.

After my orgasm faded, I was still horny, and I wondered if Mia was as stirred up as I was. After thinking it over for a lengthy period—several seconds, at least—I decided to sneak down the hallway to see what she was doing, and if she was still nude. I moved as quietly as possible, hoping that she'd left her door ajar so I could catch a candid glimpse. As I approached her room, I saw that she had indeed left it open just a bit—enough for me to see inside, but not so much as to make my spying obvious.

I moved closer and closer, just inches at a time, my field of view gradually increasing with each step. The first thing I could see was the foot of her bed, and it was moving very slightly. Next came two bare feet, one toward each corner of her mattress. Mia's ankles were at an angle; I moved closer still. Her knees were raised up and her legs were spread. They were moving rhythmically and imparting that energy to the bed below. Then I saw her upper legs—her thigh muscles contracting and releasing over and over in that same rhythm. I moved just a tiny bit closer, and I saw her hand holding something, moving it in and out of her crotch. My sister was fucking herself with a dildo.

I didn't think I could get a look at her face without her seeing me, but I did manage to find an angle where I could see her breasts. She was laying on her back, so to say her tits were bouncing might not be accurate, but they were certainly sliding up and down her chest in time with her masturbation.

I could hear her breathing. It was hot and heavy, with occasional quiet moans. The sound of my sister approaching an orgasm was so erotic that it brought my cock to attention again even though I'd just taken care of it. I couldn't help it; I grabbed my penis and began stroking while listening to my sister fuck herself. There was still a bit of leftover cum in my shaft from the previous orgasm, and pulling on my cock coaxed it out, kind of like pre-precum.

I bent my knees as I jerked off, humping my fist as much as pulling on my dick. I was careful not to moan, but since Mia didn't know I was listening, she wasn't as careful. Her breathing got deeper and faster, her quiet moans a little louder and more frequent. Her free hand grabbed one nipple and pinched it, pulling it up away from her body. I was approaching my own orgasm, and I pumped my cock faster. I wanted to cum at the same time as my sister.

It wasn't much longer before she sucked in a deep breath and held it. Her hips raised up off the bed, her dildo pushed deep into her pussy, and her legs trembled violently. She was cumming, and I followed immediately after. I put one hand at the tip of my cock to catch my spunk so I wouldn't end up painting her door. Even though I'd already shot a massive load, I filled the palm of my hand to the point where I was worried it might spill over onto the floor.

After her hips dropped back down, I quietly retreated to my room, where I cleaned up my mess and went to bed. The last thing I did was replace my comforter with a clean one, making a mental note to wash the other one in the morning.

WEDNESDAY

I awoke to the sounds of movement in the kitchen. I assumed Mia was getting her morning dose of chocolate cereal. I decided to go out to have breakfast with her, hoping to talk about the activities of the previous evening. I almost always awoke with some amount of an erection, and that day was no exception. I wasn't totally hard, and although my cock was hanging down, it was still somewhat engorged. I pulled on a pair of sweatpants and a T-shirt and headed down the hallway, stopping at the laundry room to take care of the previous night's sperm deposit. When I arrived in the kitchen, I was greeted by the site of my sister's beautiful, tight little ass. She was standing in front of the kitchen counter, naked.

She heard me enter the room, and she turned around to face me. She looked both shocked and disappointed. "Why did you get dressed?" she asked. "Didn't you like being naked with me? Or are you just chicken?" Her smirk told me that, despite all evidence to the contrary, she was still the same old Mia.

"Oh, ah, no. No, I loved being naked with you. I didn't know we were still doing that. Do you want to be naked again?"

She held her hands out at her sides, in a motion that said, "Isn't it obvious?"

"Right. I guess we are still doing that. Hang on for a minute while I go get out of these clothes."

"Ah! Hold it right there, mister! As your punishment, you have to strip in front of me. Let's go. Take it off."

"Punishment?" I asked. 'Punishment for what?"

"For getting dressed. You weren't supposed to put your clothes back on yet. Unless, of course, you're chicken."

"You rotten girl," I responded with a grin. I quickly removed my T-shirt, then pulled my sweats off. The act of getting naked with my sister made my cock spring up, fully hard.

"Are you hard all the time?" she asked, gazing at my stiff member. "It seems like you are. How do you hide all that meat in your jeans?"

"Well, actually, I'm not hard all the time. It's just that... umm... well, you see.... Ah, shit. It's you Mia. I'm sorry, but it's you. You turn me on."

Mia was still staring at my erection, but her eyes flicked up to meet mine. Her expression hadn't changed, but I saw a grin starting at one corner of her mouth, which quickly spread into a full smile.

"That's okay, Sean. You don't have to apologize. I'm a little turned on myself. I really like your penis. I've only been with one other guy, and I like the look of yours better."

I was on the verge of asking her if she wanted to touch it, or hold it, or taste it, or feel it in her pussy when she added demurely, "Do you think it would be okay if we took a shower together?"

"Yes!" I blurted out, nearly shouting. Embarrassed, I took a moment to regain my composure. "Umm, yeah, I think that's okay. Good idea, sis. We need to shower anyway. Might as well save water, right?"

"Agreed. We can have breakfast later."

I took Mia by the hand and guided her to our parents' en suite bathroom. Their shower was the biggest in the house, with room for two. I turned on the water, and as soon as it was running hot, we climbed in.

I took a bar of soap and rubbed it on Mia's back. I started at her narrow shoulders, soaping her skin. Then I moved down to her shoulder blades, then further down still. The shower was behind us, so I was preventing most of the water from hitting her, but there was still a fine spray that gradually pulled the soap down to the drain in the floor. I watched as bubbles travelled down my sister's back, between her ass cheeks, then down her legs before briefly pooling at her feet. I traced their path on her body, lightly caressing her with my fingertips. Her skin was like silk, and I lingered as I massaged her. When I got to the small of her back, I kept going down either side and cupped her ass in my two hands. It was firm yet supple. I alternated between massaging and grazing my fingertips across her beautiful behind.

I lifted her hair, heavy with water, and draped it over her shoulder. She tilted her head to one side, exposing the back of her neck to my gaze. I kissed her nape, my lips caressing her skin as I moved over to one side. Then I kissed behind her ear and nibbled on her earlobe, which made her moan gently.

Her hands were at her sides, and she reached back to find my legs. She caressed them with her palms, one on each side. Then she pulled me towards her so that my erection was up against the crack of her ass. She leaned back. Our bodies were pressed against each other, and my dick was sandwiched between us. I reached in front of my sister and cupped a breast in each hand. I slid her nipples in between my first two fingers, up to where they met the rest of my hand. I squeezed them between the "V" of my fingers, and I felt them stiffen as I massaged her soft mounds.

I couldn't help myself; I began humping her butt—not viciously, but gently. The strokes may have been soft, but my cock was quite the opposite.

Mia turned around, her face flush with desire, her lips parted slightly. I put my hands on her shoulders and let my fingers travel lightly down her arms. Her skin felt like I imagined rose petals would. She took the soap from me and started washing my chest. Slowly, patiently she washed my pecs, then moved down to my stomach. She rubbed from side to side, each time moving a little lower, until she was at my pubic hair.

My dick was rock hard and twitching, and my sister's hands were just one slight move away from it. She could have had my manhood in her delicate fingers at any moment, and I prayed for that very moment to arrive. She stopped there and looked at me.

"Sean," she whispered. "Sean, we can't. I want to, but we can't."

I continued stroking her arms, but after a moment I asked, "Can't what, Mia?"

She just stood there with the shower raining down on us. She didn't speak for a few seconds. When she did, her voice was soft and fretful. "We can't have sex. I felt your penis on my butt, and I liked it. I want more, but it's wrong. You're my brother. We have to stop."

I knew she was right. I'd never considered anything like what we'd already done, let alone sex. "Of course, Mia. You're right: no sex. Let's rinse off and get dressed."

We quickly finished up. As we were getting out of the shower, Mia said, "So that means you're the chicken, right?"

"Wait. What? You said-"

"All I said was no sex. You added getting dressed, so you're the chicken."

"Oh, you rotten girl. No, no. I'm not losing this war. No getting dressed just yet!"

Mia smirked at me. "Good. I like this game, and I'm gonna win."

We dried off and spent the day nude. Since neither of us wanted to give up, neither of us left the house. We did household chores and played some backgammon. Whatever we did, I kept my eyes on my sister. Watching her breasts sway deliciously as she did housework was hypnotic, but I especially liked it when she had to bend over. When she did so, she displayed her vagina and the little brown star of her asshole to me.

We watched another movie after dinner, and once again she wanted me to sit next to her. That time, she snuggled up next to me, hugging my arm so that her ample tits sandwiched my bicep. Any time I shifted slightly, I felt her nipple rubbing on my skin. Once again, I saw very little of the movie. I was lucky she didn't quiz me about it after.

"Sean," she said quietly after the closing credits started rolling, "I don't want to sleep alone. Do you think I could share your bed tonight? I just want to cuddle, that's all. I love cuddling with you."

The mere suggestion made my dick stand at attention. "I have an even better idea. Mom and Dad's bed is king size. Ours are just twins, and not big enough for two. If we sleep in their bed, we'll have more than enough room. We'll just make sure to wash the sheets before they get back."

Mia smiled shyly and nodded her head. "Just cuddling, right? No naughty stuff."

"Just cuddling," I replied, wondering if I could keep my word.

Mia smiled and headed for our parents' bedroom. She looked at me over her shoulder, and I took her cue to follow. She pulled the sheets back and climbed in. She lay on her side, her legs together and drawn up a bit. Her hands were up near her face. One breast was in the crook of her elbow, with the nipple peeking out at me. She looked at me and patted the bed, signaling for me to lie down next to her. Her tits pulled to one side when she moved her arm away from them.

With her legs drawn up as they were, her cunt was visible, and I saw that her pussy was shiny with her juices. She was just as excited as I was. I couldn't keep my eyes off of it. Mia didn't move; she didn't do anything to interrupt my reverie. I was transfixed for a few moments. When I finally broke away and looked at Mia, she was watching me with a little grin on her face.

I had a raging hardon. I climbed in bed with Mia and lay on my back, my stiff shaft bobbing up and down. She chuckled. "Are you going to be alright? Will that stay hard all night?"

"It just might, sis. It just might."

"Well, try to go to sleep, okay?" She put her head on my shoulder, hugging my arm. I turned my head and kissed the top of her head. Her hair smelled faintly like coconut from her shampoo. It was intoxicating.

"I'll try. No guarantees, though."

There was a clock on the nightstand; I know you're supposed to count sheep, but counting minutes was all I could do. I heard Mia's breathing slow down and become more regular—the best sign I was going to get that she was asleep. There was something I'd needed to do all day, and the opportunity to do it had finally arrived.

Taking great care not to disturb my sister, I pulled the covers off our bodies. I did it slowly and deliberately, aware of her breathing—listening for any change. Then I folded the blanket down below waist level. It took several minutes, but we both ended up uncovered, our genitals exposed.

As I'd predicted, I was still hard, and most likely would have stayed that way all night. I knew one way to get my cock to settle down—for a little while, anyway—and I had resolved to do just that. There was enough ambient light in the room so that, from my angle, I could see not only Mia's breasts, but the little tuft of pussy hair rising up from her pubic mound. I wrapped my fingers around my erection and stared at her body while I slowly and quietly masturbated.

I still had one hand free, and I wanted desperately to touch my sister's boob. I reached across my chest and placed my hand on her breast—ever so gently, ever so quietly. I didn't squeeze or grope; I merely laid my palm across her nipple.

I lay next to her, watching for any sign that she was awakening. I held her tit in one hand as I pleasured myself with the other, fist travelling up and down my stiff cock on horny autopilot. I bit my lower lip in an effort to keep from moaning. The very idea that I was masturbating in the same room—the same bed—as my sister was incredibly erotic, and getting to hold her breast in my hand while I did it made it even more of a turn-on.

I wanted to speed up—to really fuck myself hard—but I also didn't want to risk waking Mia. I kept things steady all the way up and down the length of my cock, and I knew that I'd still be able to get there. I could feel my balls pulling up tight and my dick straining. It took enormous discipline, but when I came, I didn't move my hand from her breast, and I didn't change my tempo. I pushed my head back into my pillow and gritted my teeth, feeling my orgasm grip every muscle in my body as I desperately tried to stay quiet. I felt my root contracting as I shot my load of cum. It spurted onto my upper chest, and I even got some on my chin.

I hadn't stopped to consider one important thing before I'd begun fucking my fist: what to do about the mess. I had semen all over me, and no readily available way to clean it up. A bit of post-nut clarity—or paranoia—told me that trying to get up out of bed might finally stir Mia. If she woke up and saw me covered in jizz, my secret late-night self-pleasuring wouldn't be a secret any longer.

I decided to massage it into my skin like lotion, let it dry, and deal with it in the morning. I gently let go of Mia's tit and began slowly rubbing my cum all over my chest and stomach. It seemed like the idea was going to work, but there was a lot of cum—more than usual. Just when I thought I was making progress, I'd find a new glob of semen I hadn't distributed. Finally, I felt like I'd dealt with the entire contents of my balls, so I quietly replaced the covers on both of us and snuggled up against Mia. My erection went away long enough for me to go to sleep.

THURSDAY

When I awoke, I found us spooning tightly. I was hard again, and my penis was sandwiched between my stomach and the crack of my sister's ass. As much as I was enjoying her warmth on—almost around—my shaft, I had something I needed to deal with.

I felt like the world's grossest glazed donut from my chest all the way down to my torso. I wanted to clean up before Mia got up, so I slowly extricated myself from our parents' bed and headed for the shower.

Afterwards, I went back to see if she was up yet. Simply out of habit, I'd wrapped a towel around my waist. When I entered the bedroom, Mia was sitting up in bed, her naked breasts bidding me good morning. "Hey, bro. Have you given up? I don't know if towels count, but you don't seem to be naked. I mean, I can't see your dick, so I think that kind of makes you the chicken."

I quickly whipped off my towel, exposing myself to my sister. "Habit. I haven't thrown in the towel, if you'll forgive the pun."

Mia groaned and rolled her eyes at me. "Have you been taking joke lessons from Dad?" We both laughed, and then she gave me a strange look; she had a hint of an amused smile on her face. "Did you sleep well last night?"

It wasn't what she said, but the way she said it. After a brief pause, I replied, "Yes, I did. Quite well. You?"

"I did," she said. "Maybe not as well as you, but still good."

I had a moment of mild panic. She knows. Then, to my surprise, it faded somewhat. She might not, actually, and either way, she doesn't sound pissed. I didn't know quite where that left us.

We looked at each other—her with a knowing smirk on her face, me trying to figure out whether she knew or was simply guessing. I decided to test the waters.

"Mia, the truth is that I really didn't sleep all that well last night. Sleeping next to you was a little bit... stimulating. I was awake for a while. I hope I didn't disturb you."

"Disturb me? No, I don't recall anything that was disturbing." The smirk never left her face. It slowly dawned on me that the word "disturbing" could have a couple different meanings. I was still no closer to finding out what she knew about the previous night.

"So, you didn't wake up?"

"I woke up a time or two," she replied casually, "but my memory isn't really clear. You know how sometimes you wake up in the middle of the night, but in the morning, you aren't sure if it was just a dream? That happened to me. I must have been dreaming."

Her eyes were dancing as she said it. I was leaning towards her knowing exactly what had happened. I thought about confessing, but at that moment I was precisely what she'd been accusing me of being for several days: chicken. I let it drop for the moment, but told myself I'd address eventually—soon, even.

Then I spent the whole day not doing that. The closer we got to bedtime, the more it was on my mind. When I couldn't stand it any longer, I simply asked, "Mia, last night—I woke you up, didn't I? I'm fairly sure I did, but I gotta know for sure. Were you awake?"

She just looked at me, a little smirk on her face. "Why, Sean, I'm sure I don't know what you're talking about. Tell me what you think woke me up, and I'll tell you if I might have opened my eyes for just a second or two."

"You're being a brat. You know, don't you? Are you going to make me say it?"

"Yep!"

"And you already know what it is?"

"I didn't say that I know. Maybe I do and maybe I don't. But I want to hear you say what you did."

I could feel my cheeks turning red. It might seem like splitting hairs, but it made a difference to me who went first. I didn't want to be the one to say the word "masturbate," but embarrassment was giving way to arousal. I was naked in front of my sister, about to admit that I'd jerked off while holding her boob in my hand. The thought of what I was doing was making my cock twitch.

As reluctant as I was, I couldn't stall any longer. I looked her straight in the eye and said, "Mia, I masturbated next to you in bed last night, and I felt your tit while I did it."

Mia broke out into a huge smile. "I know. You really think you can hold my melons without waking me up?"

"Well, I guess I was hoping. What were you doing? Did you watch me?"

"Yep! You were kind of hot."

"So, you just pretended to be asleep."

"That's right. But when you... finished, I thought about pretending to wake up. Just as I was about to do that, I realized you were spreading your... stuff all over your chest." Mia blushed and giggled. "The truth is, I liked watching."

"Well, maybe next time, don't pretend so much. It might have been more fun—for both of us."

Mia let a few seconds pass before she said, "Next time?"

I grinned at her. "Yeah. Next time."

"Does that mean we're sleeping together in Mom and Dad's bed again tonight?"

I realized then that I didn't know if I could walk the walk. I wanted to go to bed with her, but I was afraid of what I would do, especially after the line I'd crossed when I'd thought she'd been asleep. "Do you think we should? I mean, is it appropriate?"

Mia frowned at me. "Appropriate? Dear brother, I think we've gone way past appropriate."

"Okay then, I'll be a little more direct. Do you trust me to not take advantage of you? Because I don't. I don't know if I can resist you a second time."

"You did fine last night, Sean. If you need to, you can just take care of the problem like you did last time, but next time, you'll know that I'm watching.." She paused for a moment. "Who knows? I might need to deal with the same problem, anyway."

"Are you saying I made you horny?"

She lowered her head slightly and looked at me with her big blue eyes. "Is that weird? Is it okay that I'm horny for my brother?"

"I guess it's all out there now, isn't it? We turn each other on. Do you feel weird? I do a little, but I'm getting used to it—to us."

"So, does that mean we can sleep together?"

"If you want to. But why don't we just go ahead and plan the rest of the night? You know what I mean?"

"You mean like what you did last night? When you thought I was asleep?"

"Umm, yeah. I'd like to do that again, if you think it's okay."

"Would you mind if I did it with you? We could do it together. What do you say?"

I was momentarily at a loss for words. My sister had just invited me to watch her diddle her pussy. More to the point, she'd asked if I would mind. I didn't need much time to decide.

"No! I mean, yes! No, I don't mind, and yes, let's to it together!"

We headed for the bedroom. My heart was racing. We stood at the edge of the bed, both of us naked, both incredibly aroused. My cock was fully erect, and I saw that her nipples were sticking up from her breasts. We each climbed up on the bed, Mia at the head, and me at the foot.

We scooched around until we were facing each other, our legs spread and intertwined. That put her cunt on full display for me: pussy lips pulled apart to expose her vaginal opening. She was leaking; I could see a trickle running down from her hole, soaking into the sheets.

I glanced up at her face; she was staring at my cock. She put her hand on her stomach, just below her belly button. As her fingers descended through her tuft of trimmed pubic hair, her gaze shifted from my dick to my eyes, back and forth. She kept going down each side of her vulva, caressing her outer labia and sighing as she did so.

The sight was so erotic that I thought I might cum right on the spot. My legs were spread as wide as my sister's; my testicles were pulled up against my crotch and my dick was hard and throbbing. I wrapped my thumb and forefinger around the base of my shaft and cradled my balls in my other three fingers.

Mia moaned gently and began playing with the inner flaps of her pussy. She ran her fingers up and down the valley of her cunt, purposefully avoiding her clit. Then she dipped one into her opening, coating it with her juices. She locked eyes with me, plunged it in as deep as possible, then pulled it out and licked it clean.

I stroked my shaft slowly from base to tip, then back down. I stared at her sex while I pulled my meat, fantasizing about being inside her tight tunnel.

Mia continued diddling her pussy, and I matched my strokes to her movements, pretending I was fucking her. Her gaze switched between my cock, my eyes, and her own pussy as she stimulated herself. She started rubbing her firm little nub quickly from side to side, her breath coming in quick little gasps. It quickly escalated into a furious back-and-forth attack on her cunt.

I desperately wanted to cum, but I wanted Mia to orgasm at the same time as I did. I turned my gaze upward to her face, and that was just as erotic to me as staring at her pussy. Her eyes were wide and filled with lust as she watched me jerk my cock. She was whimpering, making little mewling noises as she brought herself closer to her pinnacle.

Just then, several things happened at the same time. Mia reached her free hand out and slapped the bed, pushing against it; her shoulders and upper body collapsed toward me, her body convulsing in orgasmic bliss; her mouth opened wide, and her head snapped back as she cried out, "FUUUUUUUUUUCK!" Her pussy juices were pouring out of her, and her flailing fingers were scattering the creamy mess all over the sheets and her inner thighs.

I was witnessing my sister's orgasm up close. Watching her cum pushed me over the top: my cock began pulsing in my hand. I used the other to point it directly at Mia's crotch. I shot rope after rope of semen at her cunt, which she rubbed all over her vulva.

I've always wondered if it's just me, but when I cum with my legs spread apart as they were, my orgasm feels twice as powerful. I came so hard that I couldn't breathe. My entire crotch was consumed by an intense feeling that radiated in all directions, even down my thighs to my knees.

We reached for each other as our orgasms shuddered through us. When we finished, we leaned forward, our arms around each other's neck, our heads resting on the other's shoulder. Fortunately, we'd been close to one side of the bed. Otherwise, one of us would have been sleeping in a very wet spot.

FRIDAY

I woke up with my sister snuggled up next to me, spooning me from behind. We were both naked, and I felt her breasts pressed against my back. It was the best way to wake up that I could possibly imagine. I gently rolled over onto my back, and the motion woke her up as well.

"Good morning, Mia. Did you sleep well?

She opened her eyes just enough to see me through the slits of her eyelids. She broke out in a big smile. "Hi, Sean." She yawned and stretched her arms above her head, running them up the headboard. I was transfixed by that unguarded and candid moment—and also her breasts. They were lifted up a little higher on her torso, becoming perfect globes.

"Hi. My god, you look gorgeous this morning."

Mia sat up in bed, our blankets down around her waist. "You flatterer, you. Let me see how you look this morning." With that, she threw the covers down at our shins, exposing my morning erection. "Yep, just as I thought. You're hard. Again."

"Actually, that's normal. I wake up this way just about every morning."

She made an exaggerated pouty face. "So, that's not just because of me? Aww, I was enjoying the flattery."

"Believe me, you excite me plenty."

"Are we naked again today?"

"Yes, we are," I quickly replied. "If you're game, so am I. I think I could really dig being a nudist."

We got up out of bed, and my boner didn't go down. We went to the kitchen for our routine chocolate-cereal breakfast—though to me it seemed anything but.

Later, as it was getting close to lunch time, the doorbell rang. Mia and I looked at each other with panic in our eyes. Mia sprang up moments before I reacted, but we both had the same idea. In my room, I threw on sweats and a t-shirt, then rushed out to the front door just as the doorbell rang a second time. I turned to look for my sister, wanting to make sure I didn't let someone in while she was still dressing. When she came out into the hallway from her bedroom, I took a deep breath and opened the door.

"Hey, Sean. Is Mia here?" It was Janice. I excused myself to my room, leaving the girls to talk. Janice didn't leave until late in the afternoon. As soon as she did, I asked Mia what they had talked about.

"Don't worry about Janice," she replied. "I thought it was awkward when she came in, and I'll bet you did too, but I managed to divert her attention. I guessed who her nudist relatives are: it's her own parents."

"Really? Janice's parents? They're the relatives she was talking about that go to a nude resort? How did you figure that out?"

"A total guess, and I hit it on the first try. I was more focused on making sure she didn't pick up on our recent activities, and I succeeded. But now that she's gone...."

I saw a twinkle in her eye as she began unbuttoning her blouse. "I'll bet I know what you're thinking," I told her. "Just a warning, though: you're going to make me hard again."

"Sean, you're always hard," she said with a laugh. "That commercial for the little pill says to see a doctor if your erection lasts more than four hours. From what I've seen, you ought to head to the ER right away."

I smiled and whipped my clothes off, and she did the same. My cock was exactly as I'd told her it would be. In turn, her nipples were firm and sticking up from her breasts.

It was dinner time, so we heated up some microwave meals Mom had left for us. While we ate, I teased Mia, telling her I had big plans for the evening. Actually, I had two ideas—one which I'd tell her about after dinner, the other I'd save as a surprise. Afterwards, we cleared away the dishes; we'd been trying to keep the place relatively clean. I couldn't help but notice that Mia's chair had a wet spot where she'd been sitting.

"Okay," she said after we'd finally taken care of business, "spill the beans. What's this plan of yours?"

I didn't reply; I simply took her hand and guided her to our parents' bedroom and the king-size bed that had become our playground.

"Here's what I'm thinking," I began. "We've agreed that masturbation is fine, even if we watch each other cum. Maybe it's okay if we masturbate each other. It's still just external stimulation, so it's not actually 'having sex.' Maybe it's a little further than we ought to go, but I'm good with it if you are—and if you promise to keep it secret."

"So, you'll allow me to jerk you off? Thats's the big plan?"

I was still holding back the second part. "No, that's not it at all. We please each other. It's mutual; we give each other orgasms. It's still basically masturbation, but... better."

Mia smiled at me. "I know, I just wanted to razz you. It sounds hot!"

I stepped towards her and put my arms around her in a hug, my boner pressed against her bare stomach. I held her naked body against mine, and I could feel her trembling.

That was when I revealed part two. "I don't believe I mentioned that I'd like to use my mouth. Does that make it more exciting for you, if I eat your pussy? Would you like me to eat you out?"

Mia's face lit up. "You serious? Hell, yes, I'd like it! I've always wanted to try that. I've heard it's fun."

"You've never done it? No one has ever done cunnilingus on you?"

"Nope. My brother will be my first—if you want."

"Oh, I want alright." I lay on my stomach and slid up between her legs until my face was inches from her pussy. I moved forward and kissed her sex, running my tongue up and down in her slit—not deeply, just a light teasing of her pussy lips. Her taste was exquisite.

Mia ran her hands through my hair, then pulled my head further into her crotch. Despite the clear signal, I took it slow at first. I sucked her flaps between my lips, feeling the texture of her inner labia. Then I pressed my tongue deeper into her vaginal valley, exploring her folds and crevices.

My stiff rod was sandwiched between my stomach and the mattress. I was eating her out and grinding my cock into the bed at the same time. I could feel my dick throbbing beneath me.

I supported myself on my elbows and caressed her inner thigh. My fingers ran up and down her leg, carressing her vulva, squeezing her lips together against my tongue. I twirled the little nub of her clit between my thumb and forefinger.

Then I let loose and tongue-fucked her for all I was worth. She began bucking her hips under my face as she started cumming. She grabbed my head and pulled my mouth tight against her snatch. She was gushing pussy juices, coating my face. I did my best to ride out her orgasm without breaking my lip lock on her twat.

She must have cum for five minutes. When she finished, she pushed my head out of her crotch. "Stop! I can't take any more!" She lay panting for a few seconds, then laughed lightly. "That was fucking amazing! Fuck!"

I propped myself up and smiled at her, wiping the girl-cum from my chin. "I'm glad you liked it. So... is there something you'd like to do? Some way you'd like to... return the favor?"

"I guess you'd like me to use my mouth on you, huh? Maybe suck you off? A little blowjob between siblings?

"Well, since you mention it..." I replied with a grin.

Mia pushed me over onto my back, freeing my rock-hard pole. She sat up and positioned herself at my side. She looked at me and smirked, then took my cock in her hand. I felt her soft fingers wrap around my shaft. Then she began sliding her hand up and down the length of my penis.

"Oh, Mia, that feels great."

"I've only done this a few times, but Owen seemed to like how I did it." She lowered her head, took my cock in her mouth, and sucked. I could see her cheeks cave in as she created a vacuum. She raised her head up slowly, pulling my cock head with her lips. When she got to the end, it came out of her mouth with an audible pop.

Although she hadn't learned to deep throat, that didn't prevent her from giving me one hell of a blow job. She pumped my cock as she tickled the underside of my crown with her tongue. I listened to her slurping my penis. I felt her saliva running down my dick and across my ball sack. I pushed myself into her, slowly fucking her face. Mia concentrated on the ridge around my mushroom head, sucking and licking it.

I groaned loudly as I felt my cock start throbbing. I held Mia's head, feeling her mouth work its magic on my dick. Then I started cumming. I shot rope after rope of cum into my sister's mouth, and I watched her throat work as she swallowed my seed.

I felt drained. Mia lay down with her arms across my chest and her chin atop them. She looked up at me and smiled. "Did I do good?"

"Oh yeah. You have a real talent there."

We talked for another hour or so, then agreed we ought to get some sleep. She'd started idly playing with my chest hair.

"Can we cuddle for a bit first?" she asked. "You give good cuddles." As she said that, she began tracing her finger aimlessly across my chest. "I like your muscles. You look so strong."

I rolled onto my side as well, facing her. She moved her hand up to rub my pectoral muscle, and I put my hand gently on her breast. I caressed her nipple, rubbing it back and forth slowly. Mia closed her eyes and sighed; her hand on my chest stopped moving. Her focus seemed to be entirely on the pleasure I was giving her tit.

I pinched and pulled her nipple, twisting it gently in my fingers. Mia moaned quietly, and I felt her hand slide down my side, down to my stomach. I kneaded her bosom like bread dough as she tickled me with her fingertips.

I was going crazy. I'd never appreciated the phrase "so close, yet so far" quite so much. If I'd rolled over on top of her just then, my cock could have been inside of her in mere seconds, and what was worse was that I was pretty sure she'd welcome it. I reached across our naked bodies and placed my hand on her butt cheek. I caressed her ass, my fingers lightly grazing her skin, getting closer and closer to her hot, wet center.

Our position prevented me from touching her pussy, but she was aware of where I was headed. She pulled her knee up higher, and as she did, her thigh landed on the base of my dick. She squirmed, her inner thigh rubbing against my throbbing cock. Her new position put my hand where I could cup her ass cheek from the side. I pulled her toward me and found my target. I had three fingers travelling up and down her slit as she ground her leg into my shaft.

I pistoned my hips ever so slightly, starting to hump her leg. She felt what I was doing and pressed her leg against my dick. I pressed right back and sped up.

"Sean," she said, "I have an idea. Will you rub your penis against my pussy? Just on the outside, not in me. If you do that against my... sensitive spot, we can get off together. It's still just mutual masturbation, right?"

As horny as I was, it wasn't a difficult decision. "Yeah, that sounds great! Hell yes, let's give it a try!"

She rolled over onto her back with her knees up. I nestled down between her legs and lay on top of her, my cock coming to rest in the groove of her slit. I pulled back until my dick head was rubbing against her clit, then pushed forward again, treating her nubbin to a long, smooth stroke. The rhythm was set, so I started rocking back and forth.

With each of my forward thrusts, she raised her hips, increasing the pressure between our genitals. She wrapped her arms around my neck and we locked our gazes. Her eyes were filled with lust, her mouth partially open. I was suddenly consumed by the need to do something we'd not yet done; I needed to kiss her. It might seem a trifle compared to the lines we'd already crossed, but at that moment it felt like the most personal thing I could do—a simple act of affection, but done in a moment of heated passion. For me, it put meaning into what we were doing. It was a signal that our mutual pleasure wasn't merely casual, but intimate and caring. We opened and closed our mouths, our lips mashed together, and our tongues caressed each other.

Mia pulled me tightly into her embrace. I felt my orgasm welling up inside me. Mia had been moaning into my mouth as we'd kissed, but then she suddenly dropped her head back onto the pillow and wrapped her legs around me.

"I'm gonna cum, Sean! I'm gonna cum! I want you to cum on my pussy!"

I shuffled my knees forward and out to the side, putting my cock right at her snatch. I grabbed my pole and began rubbing my crown back and forth across her clit, stimulating both of us at the same time. She propped herself up on her elbows so she could watch what I was doing to her. She was already on the verge of an orgasm, and it didn't take long before she dropped back down and screamed as she came.

The things we were doing were very naughty, and they turned me on like nothing ever had. I watched my sister cum, then I followed. I lowered my cock slightly, rubbing my head between her inner lips, stroking myself at the same time. Then I ejaculated on her cunt. I felt my orgasm rise from my balls, running up my prick to the tip. My semen squirted between her lips, filling her valley with my seed. It splashed as I rubbed and stroked; my cum coated her stomach, her pussy, her thighs, and the sheets.

I collapsed on the bed next to my sister, and we both fell asleep without cleaning up.

SATURDAY

I woke up early the next morning with a start, realizing what day it was. Our parents would be returning, and we had cleaning up to do. I rolled over, intending to awaken Mia, but her naked body stopped me cold. I had morning wood, and my cock was doing all the thinking at that moment.

I thought back to our first night sleeping together, and how I'd masturbated in bed next to her while I'd held her tit. The idea of coming full circle seemed appropriate, so I lay back down beside her, my hard cock in my hand. I reached across my body with my other hand and placed it on my sister's nipple. I only stroked myself a few times before she woke up.

Her eyes opened slowly, and a sly grin spread across her face. "Thought you'd give it another try, bro?"

I chuckled at her. "Yeah. You caught me." I let my hand drop off her breast and looked her in the eye. "This is our last day before Mom and Dad come home. We've only got a few hours; we should make them count."

Mia's eyes met mine. She saw something in my gaze that intrigued her. "What are you thinking, Sean?"

There was no simple answer to that question. I was thinking a lot of things: how much fun I'd had with her, how much my feelings for her had grown, and how badly I wanted to make love to her. All I could say was, "Mia, did you enjoy our week together?"

"You know I did." She ran her hands through my chest hair. "Didn't you?"

"I really did. Is there anything you would like to have done that we didn't get to?"

She didn't respond right away. After a few seconds, she said quietly, "Maybe. We did a lot of fun stuff. But... there is one thing. We were close, but..."

"Last night?"

She blushed. "Yeah. Last night. When we were, uh... playing, I was kind of hoping things would, you know, go further. What about you?"

My heart rate shot up, and I felt the blood rushing to my cock. I knew exactly what she meant, and it was exactly what I wanted as well. I wanted to fuck my sister.

Without saying a word, I climbed on top of her. I lay on top of her, our naked bodies making full contact. I supported myself with my elbows and knees so I wouldn't crush her. She reached up and wrapped her arms around me, pulling me down. My erect cock was laying against her pussy, filling the space between her labia. Mia raised her head up and kissed me, her mouth hungry for mine. As we kissed, I began rotating my hips, grinding my manhood against her sex.

Mia broke our kiss and pushed me up a little so that she could look me in the eye. Her gaze was filled with a desperate desire. "Fuck me, Sean. Fuck your little sister. I want your cock inside me. I've wanted it all week."

I reached down between us and grabbed my dick. I pulled myself up enough to get it into position at her vaginal opening. Her cunt was sopping wet, so I knew she really did want me; she wanted my hard rod inside her box. I rubbed my mushroom head all around her hole, getting it coated with her pussy juices. Then I slowly inserted my penis into my sister.

I wasn't a virgin; I'd had sex with other girls. None of my past experiences could compare to how it felt when I entered Mia. It was more than just sex. We weren't simply fucking; we were making love.

I felt her tight tunnel opening up as my cock pushed in. Her pussy was well lubricated by her own secretions, but she was definitely snug. I was about halfway inside when I pulled back, leaving only my crown inside her. Then I pushed back in, going most of the way, but not balls deep. After another partial withdrawal, I thrust in hard, burying my entire manhood inside of her.

Every one of my thrusts coaxed moans and whimpers from deep within her. I reached down and rubbed her clit with my thumb. She wrapped her arms and legs around me while I pistoned in and out of her. She held me tightly as we fucked, and she never stopped moaning out her need and satisfaction. I felt her walls contracting around my shaft, pushing me towards an orgasm I'd been trying to postpone.

I held her against my body and flipped us both over without pulling my penis out of her cunt. She was straddling me in a cowgirl position. Her knees were up at my sides, her feet below her butt. I slowly gyrated my hips in a swirling motion to stimulate her vaginal wall, and she responded by squirming on my cock. Then I cupped her ass cheeks in my hands to help her bounce up and down on my dick while I stayed still.

Mia grabbed her breasts and massaged them as she rode me. I loved watching her play with herself like that; it was yet another sign that she was just as into it as I was. Her eyes were closed, and her mouth was open; after only a minute or so, she picked up the pace.

"Sean! I'm gonna cum!" She paused between gasps. "Cum with me, cum inside me!" She gasped again. "I want to feel your hot seed!"

"Fuck, Mia! I can't hold... AAAAAUUUUGGGHHH!" There'd been no time to think, only to do what she'd asked of me.

Mia almost immediately started bucking on top of me as she was gripped in her own orgasm. "Oh Sean!" She leaned down on top of me, buried her head against my neck, and held on to me while she came. I felt our combined juices trickle out of her hole, down across my scrotum. I never wanted to leave her body. I wanted to keep my cock buried inside my sister for the rest of my life

As our orgasms faded, we rolled over to one side, arms and legs intertwined, hugging each other. In the peaceful afterglow of our union, we fell asleep.

I woke up later that morning, still inside my sister. Our fluids had spilled out around my cock and had made quite a mess on the sheets. I shot a glance at the clock. Our parents were due home within hours.

"Mia, wake up. We gotta get busy."

We spent the next several hours making sure no evidence remained of our week of debauchery. We cleaned the house, with our primary focus being our parents' room. We washed all the sheets, pillowcases, and blankets, and after they dried, we made the bed. We tidied up the bathroom and shower and checked to make sure none of our clothes were left on the floor in our parents' room.

And, of course, we put our clothes on. We decided to call our game of chicken a draw.

Mom and Dad pulled in the driveway about an hour later. It wasn't truly a close call, but when I thought about how we'd been asleep, naked, in their bed, with our bodies intertwined, that's what it felt like. I shuddered at the thought of what might have been.

They came in through the garage. Dad was toting two suitcases. "Hey you two! Thanks for holding down the fort. Anything happen while we were away?"

I shot a glance at Mia. "No, not really," I replied. "It was a boring week, to tell the truth."

I heard Mia snicker, but I didn't look at her right away. I was watching Dad carry the suitcases into their bedroom. That's when I looked at Mia, wondering if we'd left any clues behind. A moment or two later, Mom came into the house and gave us each a kiss.

"Did you guys have a good week?' Mia asked her.

"Yeah, we did," Mom replied. "Really great. You know your friend, Janice? Her parents just happened to be staying at the same resort. We got together a few times."

Dad poked his head out of the bedroom and cleared his throat at Mom. It was obvious that he hadn't intended on sharing that bit of news.

It took me a few seconds to connect the dots. Janice's parents had been at a nude resort, and our parents had been staying at the same place, which meant our own Mom and Dad were nudists. Mia put it all together before I did. By the time I turned to look at her, she was staring at me with her mouth hanging open and her eyes big as saucers. "Oh my god," she mouthed silently. Then she slapped her hand over her mouth to keep from laughing.

That was how my sister and I celebrated our first Nude Day together. After that week, Mia and I explored just about every variety of sexual activity we could imagine, and my sister has quite an imagination. She still wasn't sure what to do with her life, and it became a running joke between us that she should major in sex. I told her she was sure to graduate summa cum laude, with emphasis on the "cum."

Months went by, as they tend to do. Mia enrolled in college. She kept living with my parents, but stayed over at my apartment quite a lot. She had a couple of friends who covered for her in case our parents got nosy—and, of course, she was lying to them in turn about what she was really up to.

When we saw Nude Day coming around on the calendar again, we rather expected our parents to visit the resort again. They didn't disappoint. They didn't explicitly announce they were going there; they said something about a national park, but I didn't buy it. I also didn't blame them for keeping secrets - or at least thinking they were. How could I have?

I had agreed to stay with Mia for the week, ostensibly just to keep her company. I'd been looking forward to spending it naked with my sister. No matter how often we did the same thing over at my place, there was something special about revisiting the scene of the original crime. I arrived at the house several hours before our parents' planned departure, already itching to get our activities started.

I was getting hornier by the minute, and I was sure Mia was, too. She'd been giving me little looks and smirks throughout the morning. I could only guess what was behind her glances until she announced that she had something to do in her bedroom, and then our gazes locked. She motioned me with her eyes, indicating I should follow her.

When we got to her room, she closed the door behind us and grinned at me. "What are you doing?" I asked.

"Just wait until they leave, then I'll tell you."

"Really? You're going to bring me in here and not tell me why? Can't you at least give me a hint?"

I was a little surprised to see her blushing, and I cocked my head to one side as I asked, "What are you up to, sis?"

She went to her closet and opened the door. Laying on the closet floor were several bundles of rope. "What do you think, Sean? Can you think of something we could do with this?"

I was tongue-tied. I knew from the previous year's experience that Mia was open for just about anything sexual. I pictured her naked, bound hand and foot, tied to the bed, while I had my way with her. I couldn't wait for the fun to begin.

We went out to help our parents finish packing the car. I wanted to get them on the road as soon as possible, and they seemed to be purposely taking their time. I kept glancing at Mia, knowing she was as anxious for us to be alone together as I was.

Then a thought occurred to me: I wonder what she'll say when I tell her that rope counts as clothes, and that'll make her the chicken.

Why, I bet she'll be fit to be tied.