I found the Tumblr page by accident one night, scrolling through tags that made my cock twitch hard in my jeans. "Cum pussy sex tumblr incest stories" was what I typed, and there they were, hundreds of raw posts about brothers pounding their sisters, sons filling their moms, all of it dripping with filthy details. I jerked off to three of them before I even realized my own sister was home from college, asleep in the next room.
The next morning at breakfast, I couldn't stop staring at her. Emma was eighteen, just turned, with that tight little body she always hid under baggy shirts. But today she wore a thin tank top, nipples poking through, and I kept thinking about the stories where the brother shoots thick ropes of cum deep in his sister's pussy. My dick was half-hard under the table.
"You okay?" she asked, catching me looking.
"Yeah. Just… saw some wild shit online last night."
She smirked. "Like what?"
I showed her my phone. One post was short and nasty: "Brother fucked me raw last night and left my pussy leaking cum all over the sheets. Best incest sex ever." Emma read it, cheeks flushing pink. She didn't hand the phone back right away.
"That's hot," she whispered. "You into that stuff?"
I nodded. "You?"
She bit her lip. "Maybe. I've read a few on there too."
That was all it took. I stood up, grabbed her hand, and pulled her to her bedroom. The door clicked shut and I shoved her tank top up, sucking one hard nipple into my mouth. She moaned, hands already yanking my sweatpants down. My cock sprang free, thick and leaking.
"Fuck, you're big," she said, wrapping her fingers around it. "You gonna fill my pussy like those Tumblr stories?"
I pushed her onto the bed, ripped her shorts off, and spread her legs. Her pussy was shaved smooth, already wet. I dove in, tongue lapping at her clit while two fingers slid inside her tight hole. She tasted sweet and I ate her until she was grinding on my face, begging.
"Put it in," she panted. "Fuck me like those incest stories. Cum in my pussy."
I climbed over her, rubbing the head of my cock up and down her slit, coating it in her juices. Then I slammed in balls-deep in one thrust. She cried out, pussy clenching around me like a vice. I fucked her hard, the bed slamming the wall, her tits bouncing with every stroke.
"Talk dirty," I growled. "Tell me whose pussy this is."
"Yours, big brother. Your sister's cum pussy. Fill it up."
I pounded her faster, the wet sounds of sex filling the room. She came first, soaking my cock, but I didn't stop. I flipped her onto her stomach, yanked her hips up, and drove back in from behind. Her ass slapped against me. I reached under and rubbed her clit until she came again, screaming into the pillow.
When I was close, I pulled out, flipped her back, and shoved in deep. "Gonna cum in this pussy," I grunted. "Gonna breed my sister's cunt."
She wrapped her legs around me. "Do it. Pump me full."
I exploded, thick jets of cum blasting straight into her womb. Pulse after pulse, so much it leaked out around my cock and ran down her ass. I stayed buried, grinding the last drops in.
We lay there panting, my cum still dripping from her swollen pussy. She reached down, scooped some up, and licked her fingers. "Tastes good mixed with me," she said.
That afternoon we read more Tumblr posts together, her riding me slow while I scrolled. Every time a story mentioned "cum pussy sex" or brother-sister fucking, she clenched harder. By night we did it again, this time with her on top, grinding until I flooded her a second time.
We kept it up all week. Every load I gave her, she made sure to show me afterward, spreading her legs so I could watch my cum leak from her pussy. It was better than any Tumblr story. Real. Dirty. Ours.
And we never stopped.
