We were both home for the weekend after college, and the house was empty. I walked into the living room in just a thin tank top and panties, knowing exactly what I was doing. My brother sat on the couch, eyes glued to his phone, but he looked up when he heard me. His stare went straight between my legs.
"Stop fucking around," he said, voice low and rough. "You know what that does to me."
I didn't stop. I climbed onto his lap, straddling him, and ground my pussy against the hard bulge in his jeans. "Then do something about it, big brother. I've been wet thinking about your cock all week."
He grabbed my ass with both hands and yanked me down harder. His mouth crashed into mine, tongue pushing deep while his fingers yanked my panties aside. Two thick fingers shoved straight into my cunt, pumping fast and nasty.
"Fuck, you're soaked," he growled against my lips. "This pussy is dripping for brother dick."
I reached down, unzipped him, and pulled his cock out. It was thick, veined, and already leaking. I rubbed the head up and down my slit, smearing his precum over my clit. "Put it in. I want it raw."
He didn't need more than that. He lifted me, lined up, and slammed his cock straight into my pussy in one hard thrust. I cried out, clenching around him as he bottomed out. No slow start, just deep, filthy strokes that made my tits bounce and my juices drip down his balls.
"Yeah, take it," he grunted, pounding up into me. "This tight little sister cunt was made for my cock."
I rode him hard, slamming down to meet every thrust. The wet sounds filled the room, skin slapping, my pussy squelching around him. "Deeper. Fuck me like you mean it. Fill me up."
He flipped me onto my back on the couch, hooked my legs over his shoulders, and drove in even harder.

Every thrust hit my cervix, making me moan like a slut. His balls slapped against my ass with each stroke. I reached down and rubbed my clit fast, feeling the pressure build.
"Don't stop," I begged. "Cum in me. I want my brother to breed this pussy."
He fucked me faster, grunting, sweat dripping onto my tits. "You want it? You want my load leaking out of your cunt?"
"Yes, fuck yes. Shoot it deep."
His cock swelled, and he buried himself to the hilt. Hot, thick ropes of cum flooded my pussy, pulse after pulse filling me until it overflowed around his shaft. I came right after, walls milking him, my own juices mixing with his load.
He didn't pull out right away. He stayed buried, rocking slowly, pushing his cum deeper. When he finally eased back, thick white cream oozed from my stretched hole. I reached down, scooped some onto my fingers, and licked it off while he watched.
"Turn over," he said. "I'm not done with that pussy yet."
I got on my knees, ass up, and he slid back inside the mess he'd made. This time he fucked me slow and nasty, watching his cum-coated cock disappear into me again and again. Every thrust pushed more of his load out, running down my thighs.
"Look at that creampie," he muttered. "Brother cum leaking from your sister cunt. You love it, don't you?"
I pushed back against him, moaning. "Give me more. Fill me again."
He did. Another load pumped into me, even thicker than the first. By the time he pulled out, my pussy was a sloppy, cum-filled mess, exactly the way we both wanted it. We didn't bother cleaning up. We just lay there, his fingers lazily pushing the cum back inside while I stroked his cock for round three.
That was how the whole weekend went. Raw, messy, and exactly the kind of brother-sister cum pussy sex that belongs in those Tumblr stories.