I'm a Bad Big Sister

I spread my brother's fiancé's legs. Her ass was on my computer desk, and now one of her thighs was on each of my shoulders.

"Are you sure this is a good idea...?" The sweet, nerdy thing asked ever so softly, fixing her glasses on the bridge of her nose.

I reached under her short, slutty dress and peeled her panties from her ass and thighs. She smiled nervously, lifting her hips to assist me.

"It's not," I said simply. And then, I could smell her.

I pressed the damp cotton of my brother's girl's underwear to my nose.

"He's only downstairs..." Nina said sheepishly.

I leaned into her crotch slowly. It was dark, but I could see a gorgeously folded set of glistening pussy lips. They were dribbling. Oozing. Leaking. My mouth watered to the point of nearly drooling on my tight dress that matched Nina's. We'd had her wedding rehearsal today. Then we'd all drank, the whole family. All but me and Nina. We knew what we wanted. Now, we were upstairs in my parents' winter cabin.

"Your scent is in the air," I said, overpowered, dreamily, by the smell of her.

Nina giggled and twisted, unable to contain her excitement.

"I've wanted this for so long..." she admitted. "You're way sexier than your brother." She ran a hand through my dark hair. I blinked lovingly up at her.

"But maybe we shouldn't start something we can't--NN!" Nina groaned as I stuffed my face into her pussy.

"CNC!" Nina called out. "Let's do CNC...!" She was squirming away from me. But I was a fucking bloodhound with her scent. A wolf with the taste of her fresh on my lips, moving back in for the kill slowly.

"CNC?" I paused when I registered the words.

"Yeah, consenting... to nonconsent. Pretending. Playing... with a safe word. Constantinople."

"Uhm..."

Nina scooted her gorgeous ass away from me on the desk, her legs widening to remove her thighs from my shoulders.

"It's the only way we can do it," she explained nervously. "I can't take girly pussy eating otherwise. It's too good."

I blinked a few times, but then sort of registered what she was saying. I tore her thighs back in. I was usually too small for that sort of move, but Nina was even smaller. Nina yelped in excitement, and my pussy drenched. I reached around her ass and pressed her cunt into my face while her hands fought my head.

"No, no, no!" Nina screamed in whispers. "NnnNNNN FUCK!" she gasped, covering her mouth as my lips and tongue crashed sordidly back into her aching, slimy, delicious mess of genitals.

I lapped, suckled, prodded with my tongue, and found Jesus in the slick parts of her. God-fuck, she tasted good.

She fought and cursed at me, and I quickly learned I really liked this CNC shit.

Nina squirted in my mouth, briefly, and I swallowed. I think she came then. I wiped my chin, then pulled my own panties halfway down my thighs as I kept licking and used Nina's excess moisture to rub my clit hungrily.

"Fuck men..." Nina sighed. "Fuck your ugly brother..."

I smiled into her cunt. I wanted her to keep going. Use those lips to get me off while mine did the same to her.

"I don't want him... I don't want... his lips. I want yours... OOOH!" Nina's bare toes curled on my back as she squirted in my mouth again, and I was absolutely dribbling.

I stood suddenly, yanking a drawer of my desk open and producing a pink silicone cock from it.

Nina bit her lip, loose locks of hair over her face and her glasses low and sideways on her nose as I squatted before her, shoving my panties to my ankles, then forcing the upwards-curved end of the dildo up inside myself. A pretty pink phallus stood out from my crotch as if it were mine, and Nina smiled at it.

"Mmm baby. I didn't realise we were gonna--HEY!"

I stepped and thrust my hips forward recklessly fast. Nina yelped and clawed my bare back as I forced myself inside her.

"Wait, NN! This thing is big!"

I paused. Nina blinked back at me as I stared at her face.

"What?"

"Con... stantinople?" I asked, an eyebrow raised.

"What? No. What the fuck are you stopping for? I didn't say it."

I blinked.

"Do you, like... have any limits?" I scratched my cheek.

Nina looked up at the unpainted wooden ceiling.

"Uh. None worth mentioning."

I spit in her face, aiming just over her glasses.

"Oh," she said softly, starting to shake in fear. "Fuck..."

I slapped her face real hard, making sure to get her glasses too. They flew off and she winced, holding her cheek fearfully.

"Don't hurt me," she pleaded, and I tore her hand from her face and started to fuck her as hard as I possibly could. It felt. Fucking. Amazing. The amount of discomfort it seemed to cause Nina was only the cherry on top to make me discreetly cum for the first time as I really started to get into it.

"What the FUCK?" A deep voice called from the wide-open doorway, and I blinked as my brother watched my silicone balls slap his bride-to-be's asshole.

Nina froze, eyes wide and both hands over her mouth. I stopped too, though I rather didn't want to.

"Is this the first time? How long have you two been doing this?!"

I reached the open door handle to my left slowly and twisted the lock in the handle as my brother kept yelling at us. Then I slammed the heavy door hard, and my brother called out drunkenly as he staggered back from the blow of it.

"Should we--?"

I slapped the fuck out of Nina's pretty face and started fucking her again.

"Oh, no..." She started to cry, and I spit in her pretty face, mixing my saliva with her tears.

"Stop it," she shook her head. "I'm a slut. I always ruin everything."

"Yeah, you are..." I growled, then leaned in and bit Nina's neck hard enough to leave a mark.

"Stop fucking me!" she cried out, and I rolled my eyes.

"Then say it."

"No!"

I reached around Nina's sexy ass and up the back of her dress behind her. I got my fingers wet in the mess dribbling from her cunt, then shoved my middle finger in her ass without warning while my pink cock fucked pleasure that buzzed out through both our genitals between us.

"Say the fucking safeword, Nina!" I yelled in her face as my other hand grabbed her neck hatefully. "Say it, or shut the fuck up!" I squeezed hard, and both Nina's hands snapped to my wrist as she tried to steady herself on the edge of my desk as my hips roughly fucked her.

"I can't..." she wheezed out.

"Why not?" I screamed at her, loving this violent, primal shit. Nina had it right. Fuck my brother. No shade against him, but he didn't deserve Nina. She was too fucking cute. Too tight. Too delicious.

"It feels too fucking gooooood," Nina smiled, and I smiled too. I spit in her face again, then started ramping up into a fuck rhythm so fast and hard, we were cumming together in seconds.

"God, I love girls..." I mashed my lips into Nina's and let spit fall into her open mouth. "Love, love, looooooove girls," Nina smiled into my lips, and I bit hers painfully hard. She yelped like a newborn baby kitten as I finally slowed down fucking her.

The sound of Nina's phone ringing and the pounding of the door came back into our fields of awareness. But we just rested our foreheads on each other and ignored them, my fingers still in her ass--two of them (when did that happen?).

"You bastard," Nina whispered at my lips. She was drooling. I angled my head back and licked it up, not caring whose spit it actually was. "Fuck you," she smiled at me, and I slowly withdrew my pink cock from Nina's tight pussy, then my own.

I brought it up slowly between us, flipping it as I did. I put the L-shaped, shorter end that had been inside me into Nina's mouth. She blinked in surprise as her tongue met the gritty taste of me. I knew it'd been all day since I'd showered.

"Nnn," Nina groaned disapprovingly. I fingered her tight little asshole slowly as I put the longer part that had been in Nina's slick cunt inside my own mouth, having to duck and lean my head back to work with the L-shaped angle.

"Not to your liking?"

Nina shook her head quickly as I pressed the short dildo end into her lips further.

"Yew need uh showur," she started to say, and I took the opportunity to shove the the end further into Nina's mouth violently hard, making her gag on the potent taste of me.

"What was that?" I asked evilly, a smile on my face as I licked the Nina-tasting shaft of my pink fuckstick. The cheating slut tasted divine after a day of rehearsals with no shower.

"Did you say... Turkey?" Nina's eyes narrowed in confusion as I rolled the dildo around on our tongues and lips. "Hmm... Istanbul? Mm, no, wait... was it... Constantinople?" I paused with the dildo.

Nina shook her head in acute annoyance.

"Oh, good," I pulled my fingers from her ass and put them straight in my mouth. I knew the sexy bitch never ate anything. They tasted like nothing but dirty, delicious Nina.

I grabbed Nina's waist and tore her body down from my desk, then shoved her over onto my cozy bed for round two. It was quiet outside the door, and our phones had stopped ringing. I could hear my brother's truck starting. He was leaving. Good; I had plans for his girlfriend.

Nina shimmied her dress off her ass as I crawled over her, still in mine, then turned around once over her head, anchored my balance via both hands on her warm tits, and got into a squat over her head.

"Oh, don't you fucking dare--AUFGH!" I violently slammed my soaking pussy down on Nina's mouth, and she screamed hatefully into it. I ground my hips around, laughing as I forced Nina to taste me. She licked for a bit, then double-tapped my hip, so I sat up a bit.

"Y'okay?" I asked, brushing my hair behind my ear and peering around the curve of my ass to look down at her.

"Um, yeah," she said sweetly. "I just... kinda thought you were gunna pee in my face, the way you squatted down over me, is, uh... is all," she said, looking away awkwardly. "In my mouth in particular," Nina added very, very softly.

"Did you... want me to do that?" I scratched the tip of my nose, thighs starting to burn as I power squatted just over her face for this whole conversation.

"Oh, well, I mean, well... yeah. I mean, yeah. Most definitely," Nina nodded definitively, a tight-lipped smile on her cute-ass little face.

"Hm," I said, sitting back down on it, most definitely cutting off her ability to breathe entirely. I liked that part. "Uhm... if I do, will you marry me instead?"

Nina shrugged from down under my thighs and pussy.

"Yeah, okay," her sweet voice muttered up into me, and electric tingles buzzed up from my pussy.

"Hmm. One more thing, actually."

"Hm?"

"Can you eat my ass first?"

Nina plunged her tongue into my tight, sweaty asshole without another question. No rimming, just pure oral-penetrative pleasure.

"God, I love sluts," I huffed as I struggled to keep my cheeks balanced on my baby brother's ex's face.

"THEY LUV U TO!" Nina screamed into my sensitive ass, and I just couldn't stop laughing.