I was twenty-two and she was twenty, both of us home from college for the summer. Mom and Dad were gone for the weekend, leaving the house to just me and my sister, Lisa. We had always been close, but that closeness had started feeling different lately. The way she walked around in those tiny shorts, the way her tits bounced when she laughed too hard. I tried to ignore it until that Friday night when everything snapped.
We were drinking on the couch, some cheap vodka and soda. Lisa sat cross-legged in a tank top with no bra, nipples poking through the thin fabric. "You keep staring at my chest, big brother," she said, smirking. Her voice was low and teasing. "It's fucking obvious."
I didn't deny it. "Yeah, I am. Your tits look good. Always have."
She didn't slap me or get up. Instead she leaned forward, letting the tank top slip lower. "Then do something about it. I've seen how you look at me. I touch myself thinking about you sometimes."
That was all it took. I grabbed her, pulling her onto my lap. Our mouths crashed together, tongues pushing deep, wet and hungry.
She ground her ass against my cock, which was already rock hard in my jeans. "Fuck, sis," I groaned. "You're making me so fucking stiff."
Lisa reached down and squeezed my bulge. "I want this cock. Right now. No more pretending we're just siblings."
I yanked her tank top off. Her tits spilled out, full and perky with hard pink nipples. I sucked one into my mouth, biting just enough to make her moan. She fumbled with my zipper, pulling my dick out and stroking it fast. "God, it's thick. I knew it would be."
She slid off my lap, dropped to her knees, and took me in her mouth without hesitation. Her lips stretched around the head, tongue swirling, saliva dripping down my shaft. She sucked hard, bobbing her head while her hand worked the base. "Mmm, you taste good, brother," she mumbled around my cock, spit running down her chin. I held her hair and fucked her face, pushing deeper until she gagged but kept going.
I pulled her up, spun her around, and bent her over the couch. Her shorts came down in one tug. No panties. Her pussy was shaved smooth and already glistening. I slapped her ass hard, watching the cheek jiggle. "You want your brother's dick in this wet cunt?"
"Yes," she panted. "Fuck me. Fuck your sister."
I lined up and slammed into her. She was tight, hot, and soaked. Her walls clenched around me as I started pounding, balls slapping against her. The sound was filthy—wet skin on skin, her moans getting louder. "Harder," she begged. "Use that cock on me."
I reached around and rubbed her clit while I thrust. Lisa pushed back, meeting every stroke. "I'm gonna come on my brother's dick," she gasped. Her pussy spasmed, flooding around me, but I didn't stop. I kept drilling her until she came again, legs shaking.
We moved to the floor. She climbed on top, sinking down on my cock in reverse cowgirl so I could watch her ass bounce. She rode me rough, grinding her clit on my balls with every drop. "Fill me up," she demanded. "Come inside your little sister."
I grabbed her hips and thrust up, burying myself balls-deep. My load exploded, thick ropes pumping into her cunt while she kept moving, milking every drop. Cum leaked out around my shaft, dripping down my balls.
We didn't stop there. Later that night she sucked me hard again in the shower, water running over us while she swallowed my second load. Then I bent her over the kitchen counter and fucked her from behind until she screamed my name, her pussy squirting around me.
By morning we were still at it, tangled in my bed, her riding me slow and deep while we talked dirty about all the times we'd wanted this. No guilt, just raw need. We knew it was wrong, but that only made her ride faster and me thrust harder.
It wasn't the last weekend we spent like that. Every time our parents left, my sister and I fucked like animals—raw, messy, and exactly what we both craved.
