My Wife's Best Friend's Husband

The lake house sat quiet under a thick canopy of pines, the water outside glass-still in the late afternoon light. Mark carried the last of the bags inside while Derek stretched in the doorway like he owned the place, shoulders filling the frame, easy grin already fixed on Lisa as she brushed past him with a cooler. Jenna laughed and swatted her husband’s ass. Mark pretended not to notice how long Derek’s hand stayed on the small of Lisa’s back.

Dinner turned into wine on the deck. Derek’s voice rolled low and constant, stories about the gym, about clients who couldn’t keep up, about how some men were just built different. Every so often his eyes dropped to Mark’s lap and he smirked. “You still running those little five-Ks, buddy? Or you leave the heavy lifting to the rest of us?” Lisa’s laugh came too quick, too bright. Under the table her bare foot found Derek’s calf and stayed there. Mark felt his cock twitch traitorously against his thigh, already half-hard from the heat in the air and the way his wife’s nipples showed through her thin tank top whenever Derek spoke.

By the time the bottles emptied they had moved inside. The fire crackled. Jenna curled against Derek’s side on the big leather couch while Lisa sat too close on his other flank. Mark took the armchair across from them, nursing the last of his whiskey, watching Derek’s thick fingers idly stroke the outside of Lisa’s thigh. Higher. Higher. Lisa’s breath hitched when those fingers slipped under the hem of her shorts. She didn’t pull away. Jenna watched with heavy-lidded amusement and leaned in to kiss Derek’s neck.

“Fuck, look at that,” Derek murmured, loud enough for everyone. “Little Mark over there staring like he’s never seen a real hand on a woman. You keep her satisfied with that peanut you got, or she just settles?” Lisa made a soft, broken sound and parted her legs another inch. Derek’s knuckles clearly moved against the crotch of her shorts. Mark’s face burned. His cock was rigid now, leaking into his boxers, and he hated how much the shame fed it.

Jenna yawned theatrically around midnight and announced she was going to bed “to give you three some space.” She kissed Derek hard, then kissed Lisa slower, tongue sliding deep enough that Mark heard the wet sound of it. “Be good,” she told them, and disappeared down the hall.

The living room felt suddenly smaller. Derek didn’t move his hand. He looked straight at Mark while he cupped Lisa’s pussy openly through the fabric. “Your wife’s soaked, man. Been like this all night. You gonna do something about it, or you just gonna sit there with that little tent in your pants?”

Lisa turned to Mark, cheeks flushed, eyes glassy. Her voice came out shaky but clear. “Baby… I’ve thought about it for years. Derek’s cock. How big it must be. How it would stretch me. I— I want him to fuck me. I want you to watch.” She swallowed. “Is that okay? Tell me the truth.”

Mark’s throat worked. Humiliation and arousal tangled so tight he could barely breathe. “I… yeah. Fuck. I’m hard just hearing you say it. I want to see it. I want him to use you.” The words tumbled out before he could stop them. “Please.”

Derek’s grin turned feral. “Good boy.” He stood, hauled Lisa up by the hips, and spun her to face the back of the couch. In one rough motion he yanked her shorts and panties down to her knees. Her pussy glistened, lips already swollen. Derek shoved his own shorts down. His cock slapped heavy against his stomach—thick, veined, easily twice Mark’s length and girth, the head already shiny. Lisa stared over her shoulder and moaned like she’d been punched.

“Jesus Christ,” she whispered. “Mark, look at it. Look how fucking huge he is compared to you.”

Derek lined up and drove in to the hilt in one brutal stroke. Lisa screamed—half pain, half pure relief—fingers clawing the leather. Derek didn’t give her time to adjust. He fucked her in deep, punishing thrusts that made her ass ripple and the couch legs scrape across the floor. Every time he bottomed out she sobbed about how full she was, how she could feel him in her stomach, how Mark’s little dick had never once reached that deep.