She walked into the kitchen wearing nothing but his old t-shirt, the hem barely covering the bottom of her ass. I knew right then it was happening. No more pretending. My cock was already half-hard from the sight of her nipples pushing against the thin cotton.
"Sis, you trying to start something?" I said, voice low.
She turned, leaned against the counter, and spread her legs just enough for me to see she wasn't wearing panties. Her pussy lips were already shiny. "Been waiting for you to notice, big brother. Mom and Dad are gone all weekend. You gonna keep staring or you gonna fuck me?"
I crossed the room in two steps, grabbed her by the hips, and spun her around. Bent her over the counter. Yanked the shirt up. Her ass was perfect, round and firm. I slapped it hard, watched it jiggle, then dropped my shorts. My cock slapped against her wet slit.
"Fuck, you're dripping already," I growled, rubbing the head up and down her folds. "You been thinking about your brother's dick all morning?"
"Yes," she moaned, pushing back. "Put it in. I want it raw."
I slammed inside her in one thrust. She was tight, hot, and soaked. Her cunt gripped me like it had been waiting years. I started pounding immediately, no slow build-up, just hard, filthy strokes that made her tits bounce and her ass ripple every time I bottomed out.
"Oh god, yes, fuck your sister," she gasped, fingers digging into the countertop. "Deeper. Wreck it."
I reached around and rubbed her clit in rough circles while I hammered her. The wet sounds were loud and nasty, her juices coating my balls. She came fast, legs shaking, pussy pulsing around my shaft, but I didn't stop. I kept driving into her through the orgasm, making her moan louder.
When I pulled out she dropped to her knees without being told. She took my cock straight into her mouth, tasting herself on it, sucking sloppy and eager. Spit ran down her chin.
I fucked her face, holding her hair, using her mouth until I was ready to blow.
"Not yet," I said, pulling her up. "Bedroom. Now."
We didn't make it to the bed. I bent her over the arm of the couch in the living room and took her from behind again, this time slower but still deep, grinding against her ass on every stroke. She reached back and spread her cheeks so I could watch my cock disappearing into her.
"Play with your asshole," I ordered.
She did, rubbing her own tight rim while I fucked her pussy. The sight made me throb harder. I pulled out, spit on her asshole, and pushed two fingers in while I kept pounding her cunt. She came again, screaming into the cushions.
We moved to the floor. She climbed on top, sank down on my cock, and rode me hard, tits bouncing, hair wild. I slapped her ass and told her what a dirty incest slut she was. She loved it, grinding her clit against me until she squirted, soaking my stomach and the carpet.
I flipped her onto her back, hooked her legs over my shoulders, and fucked her like I owned her. Deep, punishing strokes that made her eyes roll back. When I finally came I stayed buried to the hilt, pumping thick loads straight into her cunt while she milked every drop.
We lay there panting, sweaty, still joined. She smiled, lazy and satisfied.
"Round two in the shower?" she asked, squeezing my softening cock with her pussy.
I was already getting hard again inside her.
"Yeah," I said. "And this time I'm taking that ass."
She grinned wider. "Good. I've been saving it for my brother."
