All Grown Up

DISCLAIMERS:

- All characters are 18+ including those in high school or graduating

- Obviously, actual incest is very bad!! This is fantasy!

- A/N: I didn't really edit this. Sorry!

All Grown Up

A sister returns home from college and her little brother's all grown up.

Lacy

"You should be nicer to Mom."

I look up from my book, surprised to find Cole standing there, swimming trunks on and a towel draped over one shoulder. I look around to see if the telltale parent is around - maybe she forced him outside under the guide of sibling bonding - but she's nowhere to be seen.

At the moment, I'm thankful for my polarized sunglasses because I can't help but check out my own brother. When I left for school he was still a sophomore - an awkward, slightly chubby sophomore. Always holed up in his room fucking around on the computer or doing homework like the good little straight-A student he's always been. Not even during the hottest of Midwest summers has he ever stepped foot in our backyard pool.

But this new Cole?

He's taller - at least by three inches, and filled out, his shoulders broader and arms noticeably muscular. His dark hair has grown out and it grazes his eyes in this perfectly tousled, sexy-if-he-wasn't-my-fucking-brother kind of way. His usually fair skin is also tanned, which tells me he's been making much more use of the pool than I'd anticipated when I camped out here this morning.

"You heard that?" I ask, suddenly embarrassed about my fight with Mom, and feeling in the strangest way, like I'm talking to a stranger. This is not the dweeby mathlete I used to yell at about using up all the hot water.

Cole shrugs off the towel, tossing it on the lounge chair next to me.

God, he looks good. Not muscley in the dehydrated gym-bro way that so many frat guys aspire to at school, but like he belongs on a farm. Or a construction site. Soft but strong and solid. Jesus, those arms.

I wonder for the briefest of moments what he thinks about me, lying out in a tiny bikini that I'd expected to wear on a beach in Mexico. Right now, I should be getting ogled by frat guys and amateur DJs - not my little brother.

Not that I'm complaining.

I swallow hard, the thought alarming. What the fuck is wrong with me?

"I think she's just missed you," he says, and it's then that I notice his voice is also noticeably deeper. You'd think I've been away for ages, not just two years. "I know I have."

I'm surprised by this.

It's not like Cole and I don't get along but our family keeps each other at an arm's length - only by spending time with exes' families have I learned that making small talk with your own siblings and parents is not the norm.

So this 'missed ya sis!' thing he's got going on? Yeah, it's a surprise. The way it makes heat pool between my legs? Also surprising.

"Thanks," I say, nervous, though I'm not sure why. "You too."

After a moment I add, "I just think it's shitty of her to demand I'm home but the second work calls, she has to up and leave. You know?"

Cole nods and he does look sympathetic, which I appreciate. But then he says:

"Well, it's not like you're missing out on much, anyway. Right?"

Wrong.

I should be getting fucked stupid by some idiot stranger I'll never see again.

Instead, I just smile and say, "Right."

~

Cole

She'd been planning to get laid, that much is obvious.

The restlessness, the irritability. Let's be real, what's there to miss out on during spring break if not meaningless fucks and getting to show off her ridiculous body in that ridiculous bikini?

I know my sister's pent up because I feel the exact same way.

The shit Lacy wears around the house doesn't help either - if she's even wearing clothes. It's usually some kind of bikini with a towel or sheer cover-up doing absolutely nothing to hide her perfectly round ass and perky cleavage. Now that Mom's gone on her business trip, too, Lacy's taken to going topless when tanning her back by the pool.

I feel like a fucking amateur, drooling over the sight of some side boob. But I'd be lying if I said the way her tits swell against the lounge chair isn't sinfully hot.

After I talked to her that first time, she watched me swim some laps for about five minutes - before I got paranoid about being too hard to get out of the pool with some dignity and left. I drained my balls in the shower just thinking about her on some stupid beach, in her tiny bikini, getting that smug smile fucked off of her face.

She'd love it, too. The attention. The sex.

I saw her vibrator charging when I had to relay some message from Mom earlier this week. Her showers have gotten increasingly long. Sometimes she comes downstairs for water, reeking of cum. It's clear that she's going crazy gooning out by herself all spring break.

Because I'm such a good brother, I decided to help her out.

~

"Were you expecting anyone?"

Lacy looks up from the couch, a cute, confused concern taking over her face. Fuck, she is pretty. Big dark eyes with long lashes. Perfect, rosy lips that are almost always turned up in a mischievous smirk. Glossy brown hair thrown up in a haphazard bun. She's, of course, in a pair of tiny shorts and a baby tee that shows off her midriff. No bra.

I pretend to remember something, conjuring up an Oh Shit! sort of expression.

"Fuck, yeah. Sorry I forgot to tell you. Some of the football guys were gonna come hang out. Use the pool and stuff." I say, walking past her to answer the door.

I fight the smile edging onto my lips when I see her light up in my peripheral. I'm sure she's been too busy with college stuff to even remember that I joined the team since she's left. But the thought of being the only girl - and a hot girl, at that - in an empty house of testosterone?

Hook, line, and sinker.

~

"Dude, your sister's fucking hot."

"Shut up, Ty, that's fucking weird."

Normally, I'd appreciate that my friend is defending my sister's honor or whatever, but to set things in motion I kind of need someone here to fuck Lacy. So I just roll my eyes in a good natured oh brother kind of way, hoping it doesn't discourage Matt, our kicker, from shooting his shot.

It doesn't.

~

Lacy

It's not, like, the best sex of my life but at least I'm getting laid.

"Fuck, oh- my GOD..." I grip my sheets and cry out, encouragingly.

The guy, Matt? Max?, has a nice dick - long enough to hit all the right places. But he's not as rough as I'd hoped. He's cautious and fucks with this wide-eyed, starry look on his face, repeating "you're so hot" over and over, like he can't believe his luck or something. He's a good looking guy but I wish he'd just shut up, pin me down, and really fuck me. God knows I'm wet enough.

Schluk... schluk... schluk...

"Aaannnhhhh....! Right there, baby," I coo, putting on the performance of a lifetime. Harder, damn it! "Rii-iiight there... oh, god, just like that."

His balls slap my clit and give me some relief but I feel myself getting impatient and almost more pent up than if I'd just fucked myself.

I flip over on my bed, swaying my ass in the air and grab my window sill. The view overlooks the backyard, but most of the other guys have left by now. I'm arching my back and roughly redirecting Matt/Max's hands to my ass and tits when I see him.

Cole.

He's in a pair of dark sweats, his hair damp, looking smug and handsome and so unlike the brother I know that it makes me whine.

And he's looking right at me.

He has one of Mom's beers in hand and he raises it, subtly enough that I could've missed it but almost like he's toasting me. He almost looks bored, an amused smile tugging at his lips, as he takes a pull of the beer and leans against the pool shed, making no moves to break eye contact.

Who is this beer smuggling, cocky asshole in my baby brother's sexed up body?

Knowing he's watching almost makes me come.

I spread my legs even wider and lean closer to the window. I splay my fingers over the glass and stare at Cole, my mouth hanging open as I moan lewdly - it takes more effort than I'd like to admit not to say his name. I wonder if he can hear any of it, muffled behind the glass.

"Unnnghh.... aaanhhh, fuck!" I moan, Matt/Max's cock hitting a sweet spot. I look back at him, biting my lip, pleading for more, playing my role of encouraging slut. "I'm s-so close,"

I roll my hips back and push against the window to fuck back into him - hard. I stare at Cole's fingers wrapped around the neck of the bottle and imagine them inside of me. On my neck. In my hair. He's grown so much, of course he'd know how to use them.

I stare at Cole, thinking about his arms pinning me down and how, if the rest of him has grown so much, have other parts? I think about that jaw of his working between my thighs and how he's always been sweet. He's always been a people pleaser.

If it were him fucking me, I'd already have come.

"Pleeease," I hear myself whining. This seems to spur my partner on and he finally picks up the pace. I moan in surprise, grinning. God, I sound slutty. "Please don't stop... fuuu...... hhhhhck!"

Shyly, Matt/Max fists my hair and tilts my head back. I beam, moaning in time with his dick thrusting into my pussy, hoping this will encourage him.

I don't have to look out to know that Cole's still there, watching.

The lewd sounds of sloppy, sucking pussy around cock fills my bedroom. I'd almost be embarrassed by how cock drunk I've become if I gave a shit what Matt/Max thought. The guy just seems happy to be here. I run my fingers over my slit, using my own slick to play with my clit. I start to shake, actually close this time.

"Oh fuck," I cry out. "Can't... can't take it, fuck, I'm gonna-"

"Me too," Matt/Max groans, hips stuttering.

I push him back and he yanks his cock out of my cunt as I turn my back to the window. I bend over, opening my mouth, my ass and creamy pussy on display. In seconds, my tongue and jaw and neck are dribbling with hot, thick cum.

~

Cole

The slut wanted me to watch. Good.

~

I was expecting Lacy to get hornier. Flirtier. Maybe start touching me more in small ways - a brush of our fingertips. A touch on the arm. The back.

I thought it'd be a gradual build up before we inevitably fucked like animals. I guess I underestimated what a slut my big sister is - because that night, she comes into my room.

"Cole?"

I stir under my covers and sit up, groggy. I fumble at my nightstand and put on my glasses. The clock on my desk reads 2:12 a. m.

"Yeah?" I croak.

Lacy pauses. "You wear glasses?"

I just nod, yawning, but my heart's hammering in my chest because I know why she's here. I just didn't expect it to be in the middle of the night. And so soon.

Wordlessly, she slips into my room and climbs on top of me. Just the feel of her weight gets me hard. The comforter separates us but now that she's closer, I can see that she's wearing nothing more than a pair of flimsy black panties. She leans into me, and fuck, she smells good, tracing my jaw and the frames of my glasses with a fingertip.

"It's unfair," she says softly. "It's so unfair how hot you've gotten."

I'd laugh if her feather light touch wasn't sending me into a tailspin.

"Lace-"

"I know," she whines. Huh? "I know. I know it's wrong and we can't actually do anything-"

We can't what??

"--but I'll take anything from you. Please. Just... just pretend to fuck me, okay? We can grind and you can pretend I'm someone else if that helps and-"

I'm trying to collect my thoughts at this development, at the fact that her tits - perky, soft, and perfect - are in my fucking face. At the fact that she'd think even for a second I'd want to imagine someone else. She starts grinding her hips down into me, babbling on about how she'll be anyone I want - fuuuuuck me - I groan. The friction coupled with her horny, brain-fogged desperation could make me cream.

But I'll be damned if I don't come inside of her.

"Lace," I moan, placing my hands on her hips. She's losing control, more bouncing and less grinding - her tits rippling, my dick painfully hard.

"Mmm-hmm?" she moans, her face adorably scrunched up in pleasure.

"No one's here. We can do whatever the fuck we want."

I yank the covers from out between us and jerk her panties to the side. She squeals in the cutest, most pornographic way possible, and I slide her bare pussy over my dick.

She is fucking soaked.

God, yes.

The thought that she wants me, maybe even more than I want her, sets fire in my veins. I roll us over, pushing her onto all fours - just how she was with Matt earlier today. Hearing all about him gush over her was hell on earth, but so worth it to watch her get fucked and plant the seed of fucking me.

Splayed out in front of me on all fours, her ass looks amazing. Her pussy glistens and her hips and ass swell around the flimsy underwear. I'd be tempted to use it to fuck her back onto my dick if I wasn't sure it'd rip.

Lacy whines and she sounds so desperate I wonder if she's gonna start crying and fuck me for thinking that it'd be the hotteest thing on earth. Here, in the middle of the night, begging and writhing around for my cock, is my big sister. Prom queen, sorority sweetheart, wannabe spring break slut. It doesn't matter how many low-IQ losers she's fucked. How long she's been away.

She wants me.

I reach between her thighs and tease her clit, running a hand up her back to cradle the back of her neck. Gently, but firmly, I force her shoulders lower, her face against my mattress.

The mattress where I've thought about her hundreds of times, fucking my fist like a lunatic.

"I don't know if I believe that you came here to dry hump," I whisper teasingly, draping myself over her back and sliding my cock against her slick. "I don't think you were satisfied this afternoon."

She keeps trying to buck her hips to increase the friction, so I have to hold her hip in place.

"And I really don't believe you want me thinking about anyone but you," I smile. I press a soft kiss against the side of her neck and she moans, a sweet whiny noise. "You want your baby brother's cock, don't you?"

She tenses and for a second, I'm worried I pushed it too far. That she'll get too hung up on the taboo of it all and change her mind. But then she's nodding, rutting back into me like a bitch in heat, and I decide not to waste anymore time.

"Take it then," I groan, gripping my cock and lining it up with her entrance.

Her pussy is wet, wetter than it looked when she was with Matt and fucking displayed herself for me. It's easy to push my cock inside her tight, dripping cunt. But it feels so good I have to fist the sheets and bite out a groan.

I can feel my cock stretching her walls.

Lacy doesn't seem to be doing much better, her delicate body shivering and her hands grasping at mine for purchase. She's practically panting, drool dribbling from her lips, so I stuff two fingers in her mouth. She moans around them, laving her tongue over them eagerly, before I take them out and rub the spit into her clit. She jerks and moans, but I keep my other hand on her hip, steady.

She's such an eager slut and I finally can't take anymore, so I start fucking her.

I force her to arch more, using my own knees to force hers wider apart, my fingers working her clit. I whisper things in her ear - that she's being such a good girl for her brother, she's so good at being used, her pussy's just what I needed, isn't this better than some stupid trip? - and thrust into her aching pussy, chasing my orgasm and forcing one out of her.

"Aaannhh...! Ahhh, my god!" she cries, her ass flush against my hips as I rut into her. My hands are all over her - her bouncing tits, her rippling ass, her squeezable hips. "F-f-fuuuuuuuck! Cole, your cock is... s-sooo big!"

I groan when she says my name, her slurred words spurring me on. I wish I could see how we look - my slutty sister skewered on my thick, cream-covered cock. By the look on her face, I'd bet this is the hardest she's been fucked, maybe ever.

"Hnnnnggg... ahh- ahh- ahh-!" Lace cries out, in time with my thrusts. She's totally cock drunk so I feel safe pushing things a little further.

"Didn't expect your little brother to have such a fat cock, hm?" I grunt, groping her tits greedily. I can't get enough of her. I flatten my tongue against her neck, lose my fingers in her hair, bury my dick in her sopping, needy pussy balls deep.

This time, she doesn't hesitate: "It's soooo thick!" she moans deliriously. "I love it... I love that big... brother cock, it fucks me so good..."

I'm getting close, so I wrap an arm around her waist and flip us over, so I'm on my back and she's on top of me. Her legs fall open and she rolls her head back against my shoulder, giddy and practically drooling.

She says it so softly, I almost miss it. But it sets me the fuck off:

"Breed me. Breed your big sister's pussy."

Twist my arm.

I pin her to my chest with one arm and use the other to realign my cock with her entrance.

Then, I slide home, fully bottoming out as she squeals and squirms on top of me. I whisper sweet things and encouragements in her ear, against her hair, telling her how good she is for keeping her legs spread, as I piston my dick up into her willing and milking cunt.

The sound of my balls, my hips smacking her soft thighs and thick ass are obscene - SMACK, SMACK, SMACK. The position leaves her totally helpless to my cock, but her whines and moans are encouragement enough.

"Oh fuck, f-fuck... fuuuuuckkk!" Lacy lets out a slutty, shameless moan, high and whining, and I know we both won't last much longer.

I think about how unfair it is that I can't come down her throat and all over her face and her tits and also fill her womb.

But her fingers dig into my arms and she thrusts her hips down on my cock, and I know what she wants.

"That's it baby," I moan. "Take it... take my cum."

It's hard for me to breathe as I bounce her up and down my twitching cock, unloading my balls inside her sweet and sucking pussy. I feel her walls tighten and she seizes up, sensitive to every thrust.

~

Lacy

We fuck like rabbits the rest of my spring break. In the shower, in the pool, on his desk, in our beds. I swallow my brother's cock while he plays some stupid video game and he bounces me on his dick while watching my favorite movie.

And every time he empties his load in me or paints my tits with his cum, I know that Cole was right:

Staying at home with him, it's not like I missed out on much, anyway.