The house was quiet except for the wet sounds of skin slapping skin. Mark stood in the hallway, cock already hard in his fist as he watched through the cracked bedroom door. His dad, Rick, had his mom bent over the bed, pounding her from behind with long, rough strokes.
"Fuck, Linda, your pussy's so wet tonight," Rick growled, gripping her hips and slamming in deeper.
Linda moaned loud, pushing back against him. "Harder, baby. Give it to me."
Mark's hand stroked faster. He was twenty-one, home from college for the summer, and this wasn't the first time he'd spied on them. But tonight felt different. The door was open wider than usual. Almost like they wanted him to see.
Rick pulled out and flipped Linda onto her back. He spread her legs wide and buried his face between her thighs, tongue working her clit while she grabbed his hair. "Yes, just like that. Eat that pussy."
Mark stepped closer, his breathing heavy. The floor creaked. Both parents looked up at the same time.
Instead of yelling, Rick grinned. "Come on in, son. Your mom's been waiting for this."
Linda sat up, tits bouncing, nipples stiff. She licked her lips when she saw Mark's thick cock in his hand. "Lock the door and get over here. We've talked about this for months."
Mark didn't hesitate. He shut the door and stripped fast. His mom reached for him first, wrapping her fingers around his shaft and stroking slow. "Look how big you are. Just like your dad." She leaned in and took him into her mouth, sucking hard while Rick watched and stroked himself.
Rick moved behind her, sliding his cock back into her pussy while she blew Mark. The room filled with the sounds of sucking and fucking. Linda moaned around Mark's dick, the vibrations making his balls tighten.
"Share that mouth," Rick said. He pulled out and they switched positions. Mark got behind his mom and pushed into her soaked cunt. It was hot, tight, and better than any girl he'd fucked at school. He thrust deep, watching his cock disappear into the same pussy that had given birth to him.
Linda looked back at him, eyes glassy. "That's it, fuck mommy. Fuck me like you mean it."
Rick fed his cock into her mouth again. They worked her from both ends, spit-roasting her while she took it eagerly. Her body shook when she came the first time, pussy clenching around Mark's shaft.
They moved her onto all fours. Rick took her ass while Mark slid back into her pussy. Double penetration made her scream into the mattress. "Don't stop. Fill me up, both of you."
Rick came first, grunting as he pumped cum deep in her ass. Mark followed right after, shooting ropes into her pussy while his dad watched.
They didn't stop there. Linda cleaned both cocks with her tongue, then rode Mark while Rick recovered. By the time the night ended, cum was dripping down her thighs and everyone was sweaty and satisfied.
Mark lay between them afterward, already getting hard again as his mom stroked him and his dad kissed her neck. This was only the beginning.
