It started the night my sister Lisa came back from her apartment after a bad breakup. She was 24, I was 26, and we'd always been close but never like this. She showed up at my door in a tight tank top and shorts, tits straining the fabric, and said she needed a place to crash. I gave her my bed and took the couch, but around 2 a.m. she padded out in nothing but panties, nipples hard from the cool air.
"Can't sleep," she said, voice low. "You either?"
I sat up, cock already twitching at the sight of her. "Get over here."
She didn't hesitate. Lisa climbed onto my lap, grinding her ass against my dick through my boxers. "We shouldn't," she whispered, but her hips kept moving. I grabbed her tits, squeezing hard, thumbs flicking those stiff nipples. "Fuck shouldn't. You want this cock or not?"
She moaned and yanked my boxers down. My thick shaft sprang free, and she wrapped her hand around it, stroking slow and dirty. "It's bigger than I thought. Bet it would stretch my pussy good."
I shoved her panties aside and slid two fingers into her cunt. She was soaked, hot and tight. "Jesus, sis, you're dripping for your brother." I pumped her fast, thumb on her clit, until she was bucking and cursing. "Fuck me already. Put that dick in me."
Lisa stood, peeled off her panties, and straddled me again. She lined my cock up with her wet slit and sank down in one go. We both groaned loud. Her pussy gripped me like a fist, hot and slick. She rode me hard, tits bouncing in my face. I sucked one nipple, biting just enough to make her yelp, then switched to the other while I slapped her ass.
"Harder, big brother. Pound that incest cunt." She slammed down over and over, juices running down my balls. I thrust up to meet her, balls slapping her ass with every stroke. The couch creaked under us. Sweat slicked our skin. She came first, clamping down and shaking, pussy pulsing around my cock while she screamed my name.
I flipped her onto her back, hooked her legs over my shoulders, and drove in deep. "Take it. Take your brother's load." I fucked her rough, long strokes that bottomed out. She clawed my back, begging for more. "Fill me up. Come in your sister's pussy."
I exploded, shooting thick ropes inside her. We stayed locked together, panting, my cum leaking out around my still-hard dick. But we weren't done. Lisa pushed me back and took me in her mouth, sucking our mixed juices off my cock like she was starving. I got hard again fast and bent her over the arm of the couch, spreading her cheeks. I licked her asshole, then pushed my cock back into her cum-filled cunt from behind.
We went at it for hours. Doggy, her riding reverse, me pinning her legs wide while I hammered her. She talked filthy the whole time. "This is real incest, isn't it? Your cock owns this pussy now." I came twice more, once down her throat and once across her tits. By morning we were sticky, sore, and grinning like idiots.
We didn't stop after that night. Every time our parents weren't around, we fucked. Kitchen counter, shower, even the backyard at dusk.
She loved it when I called her my dirty little sister while I stretched her asshole with my fingers and then my cock. We kept it raw, no condoms, her begging for my cum in every hole. It was wrong, hot as hell, and we both knew we were never going back.
