I slammed the front door behind me and heard my sister Lisa call out from the living room. "Took you long enough, little brother." She was twenty-two, three years older than me, and already stripped down to a tiny tank top and thong. Her ass looked thick and round, the kind that begged to be grabbed and spread. We had been circling each other for months, ever since that drunken night we crossed the line and I ate her pussy on the kitchen counter.
Tonight was different. She had texted me one sentence earlier: "My ass is yours if you want it." I wanted it bad.
I walked straight over, grabbed her by the hips, and spun her around so her back was to my chest. "You sure about this, Lisa? Once I start fucking that tight hole I won't stop."
She pushed her ass back against my hardening cock. "Shut up and do it. I've been fingering myself all day thinking about your dick stretching me open."
I yanked her thong down and ran two fingers between her cheeks. She was already slick with lube. Her asshole winked at me, pink and tight. I dropped my pants, spit on my cock, and rubbed the head against her hole. No slow tease. I pushed forward and sank the first few inches inside her in one hard thrust.
"Fuck!" she groaned, hands braced on the couch. "That's it, give it to me raw."
I gripped her hips and drove deeper, feeling her ass clench around every inch. She was burning hot inside, tighter than anything I'd ever felt. I pulled back and slammed in again, balls slapping her pussy. The wet, filthy sound of my cock pounding her asshole filled the room.
Lisa reached back and spread her cheeks wider. "Deeper, you fucker. Wreck your sister's ass."
I gave her exactly what she asked for. Long, hard strokes that bottomed out, my cock disappearing completely into her stretched hole. Her moans turned into loud, dirty grunts every time I bottomed out.
I reached around and rubbed her clit while I fucked her, feeling her juices drip down my fingers.
We moved to the bedroom without pulling out. I bent her over the edge of the bed and kept pounding. Her ass cheeks rippled with every thrust. I spat on her hole again for more lube and watched my cock slide in and out, shiny and thick. She pushed back to meet every stroke.
"Harder," she begged. "Make it hurt so good."
I slapped her ass red and drove into her faster, the bed creaking under us. Sweat ran down my chest. Her asshole fluttered around my shaft, gripping me like a fist. I knew I wouldn't last much longer, so I pulled out, flipped her onto her back, and pushed her knees to her chest.
Her hole gaped slightly, ready for more. I slid back inside in one smooth motion and started fucking her in long, grinding strokes. I leaned down and kissed her hard, tongues messy, while my cock kept working her ass open. She reached between us and fingered her own pussy, coming with a sharp cry that made her ass clamp down even tighter.
That did it for me. I buried myself to the hilt and unloaded, pumping thick ropes of cum deep into her bowels. She moaned at the feeling of being filled, milking every drop with little squeezes of her hole.
I stayed inside her until I softened, then slowly pulled out. Cum leaked from her stretched asshole and ran down her crack. Lisa smiled up at me, flushed and satisfied.
"Round two in the shower," she said. "This time I want you to fuck my ass while I'm on my knees."
I was already getting hard again. Family secrets had never tasted this good.
