I slammed the door behind me after another bullshit family dinner, heart pounding. My sister Jess was already in the kitchen, 22 years old and looking like pure sin in those tiny shorts that barely covered her ass. We were both adults, no excuses, but the way she bent over the counter to grab a glass made my cock twitch instantly.
"Fuck, stop staring like that," she said, but her voice had that low, teasing edge. She knew exactly what she was doing. We'd been dancing around this for months, ever since she caught me jerking off to one of those Tumblr incest threads she left open on her laptop. The ones with titles just like this, full of raw brother-sister cum dumps.
I stepped up behind her, pressing my hard dick against her ass through my jeans. "You left that shit up on purpose. 'Cum in sister pussy' stories, huh? You want it that bad?"
Jess pushed back against me, grinding slow. "Maybe I do. Maybe I want my big brother to fill my cunt just like those dirty posts." Her words were straight filth, no romance, just need. She spun around, yanked my zipper down, and wrapped her hand around my thick shaft. "God, you're already leaking for me."
I grabbed her hair and pulled her into a rough kiss, tongues sloppy, while she stroked me hard. "Get on the table," I growled. She hopped up, spread her legs, and peeled those shorts off. No panties. Her pussy was shaved smooth, lips already glistening. I dropped to my knees and buried my face in it, licking deep, sucking her clit like I was starving.
Jess moaned loud, hips bucking. "Eat that sister pussy, fuck yes. Just like the Tumblr guys do." I tongue-fucked her hole, tasting her sweet juice, then slid two fingers inside while I licked. She came quick, thighs clamping my head, screaming my name.
I stood up, cock throbbing, and rubbed the head up and down her slit. "You want this raw? No condom, just like those stories?"
"Goddamn right," she panted. "Shove it in. Fill your sister's cunt."
I thrust balls-deep in one stroke. Her tight walls gripped me like a vice, hot and wet. We fucked hard right there on the kitchen table, the wood creaking under us. I pounded her pussy mercilessly, watching my dick disappear into her over and over, her juices coating my shaft. Jess clawed my back, dirty-talking nonstop. "Harder, brother. Wreck that hole. I want your cum leaking out of me all night."
I flipped her over, bent her across the table, and slammed back in from behind.
Her ass jiggled with every thrust. I reached around and rubbed her clit fast, making her squirt a little on the floor. "Take it, slut sister. Gonna pump you full."
"Don't stop," she begged. "Cum in me. Breed this pussy."
My balls tightened. I buried myself to the hilt and exploded, thick ropes of cum flooding her cunt. Pulse after pulse, I kept thrusting, pushing it deeper. Jess came again, her pussy milking every drop out of me. When I finally pulled out, a big glob of white cum oozed from her swollen lips, dripping down her thigh exactly like the Tumblr pics she loved.
We stayed there panting, my cum still inside her. "Round two in my room," she said, standing up on shaky legs. "This time I want it twice as deep."
By the end of the night we'd fucked three more times, every load pumped straight into her sister pussy, just like the forbidden stories that started it all. No regrets, just raw satisfaction.
