Mark had been dropping hints for months, leaving browser tabs open with videos of thick cocks stretching tight pussies while his wife Sarah was around. She finally asked one night what the hell he was into. He told her straight: he wanted to watch her get fucked by a real big cock, not his average size.
Sarah laughed at first, but her cheeks flushed and she asked if he was serious. He was. Two weeks later they met Derek at a hotel bar, a tall black guy Mark found online who sent dick pics that made Sarah's eyes go wide when she saw them.
They got a room. Mark sat in the chair by the bed while Derek pulled Sarah close and kissed her hard. His hands went straight under her dress, squeezing her ass. Sarah glanced at Mark, nervous but wet already. Derek didn't waste time. He pushed her onto the bed, yanked her panties off, and spread her legs. His cock was already hard, veined and heavy, easily nine inches and thick as her wrist. Sarah stared at it. "Fuck, that's big," she whispered.
Derek rubbed the head against her slit, smearing her juices. "You ready for this?" he asked. Sarah nodded. He pushed in slow at first, but her pussy had to stretch around him. She gasped and grabbed the sheets. Mark's own cock was out, stroking as he watched inch after inch disappear inside his wife. Sarah moaned loud when Derek bottomed out, her belly slightly bulging from the size. He started thrusting, balls slapping her ass with every stroke. The wet sounds filled the room.
Sarah came fast the first time, legs shaking, pussy clenching around that thick shaft. Derek didn't stop. He flipped her onto all fours and slammed back in from behind. Her tits swung and she pushed back to meet him. "Harder," she said. Derek gripped her hips and pounded, the bed creaking. Mark could see her pussy lips gripping the cock on every pull-out, glistening. She looked over at him, eyes glassy. "It's so fucking deep. I love it."
They switched positions twice more. Sarah rode him next, sinking down slow, then bouncing. Her juices ran down Derek's balls. She came again, grinding her clit against him. Derek took over, holding her waist and jackhammering up into her until she screamed. Mark came in his hand watching her face twist in pleasure he'd never given her. Derek pulled out at the end and shot thick ropes across Sarah's tits and stomach. She rubbed it in, breathing hard.
After Derek left, Mark climbed onto the bed and slid into her sloppy, stretched pussy. It felt different, looser and slick with another man's cum. Sarah kissed him and told him she wanted to do it again next weekend. Mark agreed. From then on their sex life changed. She started watching the big cock videos with him, picking guys online, and describing how she wanted them to fuck her. Every new cock she took made her more open, dirtier, begging for it deeper and harder. Mark never got tired of watching his wife get introduced to bigger and bigger dicks.
