She walked into the house after a long day and heard the shower running. Her brother had just gotten back from the gym again, and the thought of his thick body under the water made her pussy twitch. At twenty-five she knew it was wrong, but she had been thinking about his cock for months. Last week she had seen it by accident when he left the bathroom door open, and that huge veiny monster had been all she could think about since.
The water stopped. He stepped out with a towel around his waist, water still dripping down his chest. "Hey sis," he said, but his eyes dropped to her tight tank top and the way her nipples were already hard.
"Fuck it," she said out loud. She grabbed the towel and yanked it off. His cock hung heavy between his legs, already starting to swell. It was massive, thick as her wrist and longer than anything she had ever seen. Veins pulsed along the shaft and the head flared wide.
"Jesus, look at that thing," she muttered, dropping to her knees right there in the hallway. She wrapped both hands around it and still had room to stroke. It grew rock hard in seconds, the head shiny and leaking. She licked the slit, tasting him, then opened wide and sucked the tip into her mouth.
He groaned and grabbed her hair. "Suck that big dick, little sister. You've been staring at it for weeks."
She took as much as she could, gagging when it hit the back of her throat. Spit ran down her chin as she worked him, one hand pumping the base while her tongue swirled. Her pussy was soaked through her shorts. She reached down and rubbed her clit through the fabric, moaning around his cock.
He pulled her up, spun her around, and bent her over the kitchen counter. "You want this huge dick in your tight cunt? Say it."
"Fuck me with that monster cock, big brother. Stretch my pussy."
He ripped her shorts down and slammed inside in one thrust. She screamed at the burn and the fullness. He was so thick it felt like she was being split open, but the pain turned to heat fast. He pounded her hard, hips slapping her ass, that massive cock driving deep with every stroke. Her tits bounced against the counter and she pushed back to take more.
"Harder," she begged. "Fuck your sister like you mean it."
He grabbed her hips and gave it to her rough, balls slapping her clit. She came hard, cunt clenching around him, juices running down her thighs. He didn't stop.
He flipped her onto the table, spread her legs wide, and drove back in. She watched his thick shaft disappear inside her, stretching her lips obscenely.
He fucked her through two more orgasms, then pulled out and shoved his cock into her mouth again. She tasted her own pussy on him and sucked greedily until he grunted and unloaded down her throat. Thick ropes of cum flooded her mouth and she swallowed every drop, licking him clean while he stayed hard in her hand.
They moved to the couch. She climbed on top and sank down on that huge dick again, riding him slow at first so she could feel every inch. He played with her tits, pinching her nipples while she bounced. "This pussy belongs to my cock now," he growled.
She came again, grinding down, then he flipped her onto her back and folded her legs to her chest. He fucked her deep and steady, the wet sounds of her cunt filling the room. When he came the second time he pulled out and painted her stomach and tits with heavy spurts, marking her.
They lay there panting, his cock still twitching against her thigh. She reached down and stroked it, already feeling it swell again.
"Round three," she whispered. "Don't stop until I can't walk."
He grinned and rolled her over. "Whatever my little sister wants."
