Mark slammed the door shut behind them, his cock already hard in his jeans as he watched his sister Lisa peel off her tank top. Her tits bounced free, nipples stiff, and right behind her their older brother Tom was already unzipping, pulling out his thick dick and stroking it slow. “You two are really doing this,” Mark said, voice rough. “Damn right we are,” Lisa shot back, dropping to her knees between them. She grabbed Mark’s cock first, sucking the head hard and wet, then turned and swallowed Tom’s shaft down to the balls in one go. Tom groaned and thrust forward, fucking her throat while Mark stripped the rest of the way and slapped his cock against her cheek.
Lisa pulled off Tom with a pop and switched, taking Mark deep while she jerked Tom’s spit-slick dick. “Fuck, sis, your mouth feels so good,” Mark growled, hands in her hair. Tom moved behind her, yanking her shorts down and spreading her ass. He licked her pussy from behind in long, sloppy strokes, then shoved two fingers inside her while he kept eating. Lisa moaned around Mark’s cock, the vibration making his balls tighten.
They moved to the couch. Lisa climbed on top of Mark, sinking down on his cock with a wet sound. She rode him hard, tits bouncing, while Tom stood over them and fed his dick into her mouth again.
Mark reached up and grabbed Tom’s balls, squeezing just enough to make his brother grunt. “Yeah, touch me too, little brother,” Tom said, hips snapping. Mark leaned forward and licked the base of Tom’s cock where it stretched Lisa’s lips, tasting both of them at once.
Lisa climbed off and pushed Mark onto his back. She straddled his face, grinding her soaked pussy on his tongue while Tom knelt between Mark’s legs and swallowed his cock in one smooth motion. Mark moaned into Lisa’s cunt as Tom sucked him sloppy and deep, one hand stroking what his mouth couldn’t reach. Lisa leaned forward and joined him, both of them licking and sucking Mark’s dick together, tongues sliding over each other.
Tom pulled off and lined up behind Lisa. He pushed into her ass while she was still sitting on Mark’s face. Mark kept licking her clit as Tom’s cock slid in and out right above his mouth. The sight and smell made him throb. “Fuck her harder,” Mark told Tom, voice muffled. Tom did, pounding her until Lisa came with a shout, pussy flooding Mark’s tongue.
They switched. Tom lay back and Lisa mounted him, taking his cock in her pussy. Mark moved behind her, working lube over his shaft before pressing into her ass. She was tight and hot, and the feeling of Tom’s cock moving inside her through the thin wall made both brothers groan. They found a rhythm, fucking her together, cocks rubbing against each other inside their sister. Lisa clawed at Tom’s chest, swearing and begging for more.
Mark pulled out and shoved his cock into Tom’s mouth again, letting his brother taste Lisa’s ass and Mark’s precome. Tom sucked greedily while still thrusting up into Lisa. Then Mark moved back and pushed into Tom’s ass instead, fucking his brother while Tom kept pounding their sister. The room filled with the wet slap of skin, grunts, and filthy talk. “Fill her up, Tom,” Mark ordered. “Then I’m taking your load out of her with my tongue.”
Tom came first, groaning loud as he pumped Lisa full. Mark pulled out of Tom, flipped Lisa onto her back, and buried his face between her legs, licking and sucking Tom’s come out of her while she came again on his tongue. Tom recovered fast and slid behind Mark, pushing into his ass. Mark kept eating Lisa while Tom fucked him rough and deep.
When Mark finally came, it was with Tom’s cock in his ass and Lisa’s thighs locked around his head. He shot hard across the couch, body shaking. They collapsed in a sweaty pile, breathing hard, already talking about round two. Lisa reached down and stroked both their softening cocks. “We’re not done yet,” she said. “Not even close.”
The three of them stayed tangled together the rest of the night, switching positions, trading loads, and pushing every boundary they had left. By morning they knew this was only the start of how far their family secret would go.
