The moment the door clicked shut behind their parents, the house changed. Mark and Lisa, both twenty-three and living under the same roof again after college, had been circling each other for weeks. Tonight the air felt thick with everything they had never said out loud.
Lisa stood in the kitchen in nothing but an old T-shirt that barely covered her ass. Mark watched her from the doorway, cock already half-hard in his jeans. “You know what I want tonight,” he said, voice low and rough.
She turned, eyes dark. “Say it.”
“I want your shit on my dick. I want to fuck you while you push it out. I want it messy and nasty and all over both of us.”
Lisa smiled, slow and filthy. She hooked her thumbs in the hem of the shirt and pulled it off. Her tits bounced free, nipples tight. She stepped closer, reached down, and squeezed the bulge in his pants. “Then get naked and follow me to the bathroom. I’ve been holding it for you all day.”
They didn’t bother with the bed. The bathroom floor was cool tile, easy to clean later. Mark stripped fast, his thick cock springing up, already leaking. Lisa climbed into the big shower stall and got on all fours, ass toward him. She spread her cheeks with both hands.
“Watch,” she said.
Her asshole flexed. A soft, warm log began to crown, dark brown and firm. Mark groaned and dropped to his knees behind her.
He pressed the head of his cock right against her pushing hole. The shit touched his skin, hot and slick. Lisa moaned and pushed harder. More came out, smearing across his shaft as he rubbed it up and down her crack.
“Fuck, that’s it,” he growled. He grabbed her hips and pushed forward. His cock slid into her cunt easily—she was soaked—but the mess from her ass coated everything. Every thrust made wet, filthy sounds. Shit clung to his balls and her thighs. The smell hit them both, earthy and intimate, and it only made them hotter.
Lisa pushed again. Another soft wave slid out, landing on the tile between her knees. Mark pulled out, dragged his shit-smeared cock through the mess on the floor, then shoved it straight back into her pussy. “Take it,” he snarled. “Take my cock covered in your shit.”
She rocked back, meeting every thrust. “More,” she begged. “I want it on my clit too.”
He reached around, scooped a handful of the warm mess from the floor, and rubbed it over her swollen clit while he fucked her. Lisa cried out, cunt clenching hard around him. She came fast and loud, juices mixing with the filth running down her legs.
Mark wasn’t done. He pulled out, flipped her onto her back on the wet tile, and straddled her chest. His cock, glistening with her shit and her cream, hovered over her open mouth. “Clean it,” he ordered.
Lisa licked from base to tip, tongue dragging through the bitter-sweet mess. She sucked the head, moaning at the taste, then opened wider so he could fuck her throat. He held her hair and pumped, using her mouth while more shit squeezed out of her onto the floor beneath them.
When he was close he pulled back, aimed at her tits, and came in thick ropes that splattered across her skin and the shit already streaking her chest. Lisa rubbed it all together with both hands, smearing everything into a glossy, obscene layer.
They stayed on the floor afterward, breathing hard, bodies slick and stinking. Mark leaned down and kissed her, slow and deep, tasting everything. “Again tomorrow?” he asked.
Lisa smiled against his mouth, already pushing another load out onto the tile. “Every night we’re alone.”
