The first time it happened, it was late and the house was quiet except for the low hum of the fridge downstairs. Jake stood in the doorway of his sister Emma's room, watching her scroll on her phone. She was eighteen, just like him, and the way her tank top rode up over her flat stomach made his cock twitch in his shorts.
"You keep staring like that and I'm gonna think you want something," Emma said without looking up. Her voice was low, teasing, the same tone she used when she sent him those Tumblr links late at night. Links with titles just like this one. Brother cums deep in sister's pussy. Raw. No protection. No pulling out.
Jake stepped inside and shut the door. "Maybe I do."
Emma set the phone down. Her eyes dropped to the obvious bulge in his shorts.
She licked her lips once, slow. "Lock it."
He did. Then he crossed the room in three strides, grabbed her by the hips, and pulled her to the edge of the bed. No slow build this time. No talking about how wrong it was. They both knew. They both wanted it anyway.
Emma yanked her shorts and panties down in one motion. Her pussy was already slick, lips puffy and pink. Jake shoved his shorts off, cock springing free, thick and leaking at the tip. He didn't ask. He just lined up and pushed inside in one hard thrust.
"Fuck," Emma hissed, head tipping back. Her cunt clenched around him, hot and tight. "God, yes. Fill me up like those stories."
Jake started fucking her with short, brutal strokes. Skin slapped skin. The wet sound of her pussy taking every inch filled the room. He grabbed her thighs, spread her wider, and drove deeper until his balls slapped her ass.
"Look at you," he growled. "Taking your brother's cock raw. You want that cum, don't you?"
Emma nodded fast, eyes glassy. "Deep. I want it deep. Don't pull out."
He didn't. He fucked her harder, faster, the bed creaking under them. Emma's tits bounced with every thrust. She reached down and rubbed her clit in quick circles, moaning loud enough that Jake slapped a hand over her mouth.
"Quiet," he warned, but he didn't slow down. His cock dragged along her walls, hitting that spot that made her eyes roll back. Her pussy fluttered and then she came, squeezing him in rhythmic pulses.
Jake groaned, hips stuttering. "Gonna cum. Fuck, I'm gonna cum in your pussy."
"Do it," Emma begged against his palm. "Cum in me. Cum in your sister's pussy."
He buried himself to the hilt and let go. Thick ropes of cum pumped straight into her, pulse after pulse, flooding her cunt until it leaked out around his shaft. He stayed buried, grinding slow, pushing it deeper while Emma trembled through the aftershocks.
They didn't stop there.
Later that night, after they heard their parents go to bed, Emma climbed into his room wearing nothing but an old t-shirt. She straddled him on the bed and sank down on his already-hard cock again. This time she rode him slow and dirty, rolling her hips so every inch stayed inside her cum-slick pussy.
"Feel that?" she whispered, leaning down so her tits brushed his chest. "Your cum's still in me. Feels so fucking full."
Jake grabbed her ass and thrust up to meet her. "Gonna put more in there."
She grinned, wicked and wet. "Good. Tumblr stories always end with the sister dripping."
They fucked until the sun came up. Jake came in her three more times, each load thicker than the last. By morning Emma's thighs were sticky, her pussy swollen and used, cum oozing out every time she moved. She didn't clean up. She just pulled her shorts on over the mess and went downstairs for breakfast like nothing had happened.
But every night after that, the door stayed locked.
Sometimes she bent over the desk so he could take her from behind, pounding into her until his cum flooded her again. Sometimes she rode him reverse cowgirl, watching in the mirror as his cock disappeared into her dripping cunt. Sometimes she just climbed on top while he was gaming, sank down, and used his dick until he pumped another load inside her.
"More," she always said. "Don't stop. Cum in sister's pussy again."
And Jake never pulled out. Not once.
The Tumblr stories they read together got dirtier after that. They bookmarked the ones where the brother bred his sister over and over, filling her until she couldn't hold any more. Real life stayed better than the fiction. Every time Jake finished inside her, Emma would reach down, scoop up the mess, and lick her fingers clean while he watched.
"Next round," she'd say, voice hoarse. "Don't make me wait."
They never talked about stopping. They just kept going, night after night, his cock buried in her cum-filled pussy, both of them chasing the next hot, wet rush of him emptying everything he had exactly where she wanted it.
