I came home early from the conference and the first thing I heard was the wet slap of skin on skin coming from the bedroom. The door was cracked open just enough for me to see everything. My wife, Lisa, was on all fours in the middle of our bed, her ass high and her face buried in the pillows while a tall, muscular black guy gripped her hips and drove his cock into her. It was massive, thick as my wrist and veined, stretching her pussy wide every time he slammed forward. The sound was filthy, loud, and wet, her juices coating his shaft and dripping down her thighs.
Lisa moaned like a whore, pushing back to take every inch. "Fuck me harder, Marcus, wreck that married pussy," she begged, voice hoarse. Marcus grunted and gave it to her, his heavy balls swinging and smacking against her clit with every thrust. I stood frozen in the hallway, cock already rock hard in my pants, watching my wife get pounded by that huge black dick she clearly craved.
He pulled out for a second and I got a full view of how open her cunt was, pink and swollen, glistening. Then he flipped her onto her back, lifted her legs over his shoulders, and shoved back in balls-deep. Lisa screamed in pleasure, her tits bouncing wildly as he fucked her with long, powerful strokes. "You love this big black cock, don't you?" he growled. "Tell me how much better it is than your husband's."
"Yes, god yes," she panted. "It's so much bigger, fills me up so deep. Don't stop, please don't stop." Marcus leaned down and sucked one of her nipples into his mouth while he kept pounding her, the bed creaking under them. Her hands clawed at his back, leaving red marks.
I couldn't look away. My hand went to my own cock, squeezing it through my jeans as I watched him pull almost all the way out, the head catching on her entrance, before slamming back in. Lisa's pussy lips clung to that thick shaft like they didn't want to let go. She came hard a minute later, body shaking, juices squirting around his cock and soaking the sheets. Marcus didn't slow down. He kept fucking her through the orgasm, making her scream again.
When he finally pulled out, his cock was shiny with her cream. He flipped her again, this time putting her on top. Lisa straddled him and sank down on that monster dick in one smooth motion, her head thrown back in ecstasy. She rode him fast and dirty, grinding her clit against his pelvis, taking him so deep I could see her stomach bulge slightly. "Ride that cock, slut," he ordered, slapping her ass hard enough to leave a handprint. Lisa obeyed, bouncing harder, her tits swinging.
I unzipped and started stroking myself right there in the hallway, matching her rhythm. She looked over at one point and our eyes met through the crack in the door. Instead of stopping, she smiled, a wicked, satisfied smile, and started grinding even slower, showing me exactly how deep she was taking him. "He's watching," she told Marcus, voice dripping with lust. "Good," Marcus said. "Let him watch his wife get the fucking she needs."
Lisa leaned forward, ass cheeks spread, and Marcus took over again, thrusting up into her from below with powerful strokes. The sight of that huge black cock disappearing into my wife's stretched pussy over and over was the hottest thing I'd ever seen. She came again, shuddering and moaning his name, then reached back to spread herself wider for him.
Marcus flipped her one last time, put her on her knees at the edge of the bed, and stood behind her. He drove back in and fucked her like a machine, the wet sounds filling the room. Lisa's moans turned into one long, broken cry as he used her. When he was close he pulled out, stroked that massive cock a few times, and shot thick ropes of cum across her ass and lower back. Some of it dripped down between her cheeks and over her well-fucked pussy.
Lisa stayed there, panting, cum sliding down her skin, while Marcus stepped back. She looked at me again through the doorway, eyes glassy with satisfaction. "Come here," she said softly.

I walked in, cock still in my hand. She reached for me, pulled me close, and whispered, "Now you know what I really need."
I came right then, shooting across her tits while Marcus watched with a smirk. Lisa licked a drop off her finger and smiled up at me. "Next time you can join," she said. The three of us stayed in that room for hours after that, the air thick with sex and the sound of her getting used exactly the way she wanted.