Mark had his face buried in the pillow and his ass up high when the bedroom door swung open. He didn't hear it at first because he was too busy grunting while Derek's thick cock slammed into him from behind. The wet slap of skin on skin filled the room, Derek's heavy balls swinging and smacking against Mark's taint with every thrust.
"Fuck yeah, take that dick," Derek growled, gripping Mark's hips hard enough to leave red marks. He pulled almost all the way out, then drove back in balls-deep, making Mark's hole stretch around the veiny shaft. Mark moaned like a whore, pushing back to meet every stroke. His own cock hung heavy and dripping between his legs, swinging with the force of Derek's pounding.
Neither of them noticed the shadow in the doorway until the sharp intake of breath cut through the noise.
"What the fuck is this?"
Lisa's voice was low and stunned. She stood there in her work clothes, keys still in her hand, staring at her husband getting railed by another man. Mark's head jerked up. Derek froze mid-thrust, cock still buried to the root in Mark's ass.
For a second nobody moved. Then Derek gave one slow, deliberate pump, like he was testing how far he could push it. Mark's hole clenched around him.
"Lisa… shit," Mark started, voice hoarse from moaning.
She didn't scream. She just closed the door behind her and leaned against it, eyes locked on the spot where Derek's cock disappeared into her husband's stretched hole. "Don't stop on my account," she said, voice tight but steady. "Looks like you've been practicing."
Derek glanced at Mark, then at Lisa. A smirk tugged at his mouth. He pulled out halfway, letting her see the shiny length of his cock coated in lube and Mark's juices, then slammed back in. Mark gasped, his cock twitching and leaking a string of precum onto the sheets.
"You like watching your husband get fucked?" Derek asked her directly, voice rough. He started thrusting again, slower now, making sure every inch was visible. Mark's rim gripped and fluttered around the thick shaft.
Lisa's breathing changed. Her hand drifted to the buttons of her blouse but she didn't undo them yet. "Keep going," she said. "I want to see how deep he takes it."
Derek didn't need more invitation. He grabbed Mark's shoulders, yanked him upright so his back was against Derek's chest, and started fucking him hard and fast.
The new angle let Lisa see everything: Mark's hole swallowing cock, his own neglected dick bobbing and slapping against his stomach, the way his balls tightened every time Derek bottomed out.
Mark's voice broke into filthy moans. "Fuck, Derek, right there—harder—use that hole."
Lisa moved closer to the bed, close enough to hear the wet squelch every time Derek's cock pulled out. She reached out and wrapped her fingers around Mark's leaking dick, giving it one slow stroke. "You've been hiding this from me," she murmured, thumb smearing his precum. "All those late nights. Now I know why your ass was always so loose when I wanted it."
She stroked him in time with Derek's thrusts. Mark was shaking, caught between two hands and one relentless cock. Derek's breathing turned ragged. "Gonna fill him up," he warned. "You want to watch me breed your husband's ass?"
Lisa's grip tightened. "Do it."
Derek drove in deep and stayed there, hips jerking as he unloaded. Mark felt every hot pulse, thick cum flooding his guts and leaking out around the base of Derek's cock. The sensation pushed him over; he shot hard across Lisa's fingers and the sheets, hole clenching rhythmically around the cock still buried inside him.
When Derek finally pulled out, a thick trail of cum followed, running down Mark's balls and inner thighs. Lisa didn't let go of his softening dick right away. She looked at the mess, then at both men, breathing heavy.
"Next time," she said quietly, "I want to pick the guy."
Mark turned his head, still panting, ass dripping. Derek was already half-hard again just from the way she said it. Lisa kicked off her shoes and started unbuttoning her blouse the rest of the way. The afternoon wasn't over yet.
