Mark had always been the kind of guy who fucked women and never thought twice about it. Married once, divorced now, he spent his nights scrolling through the usual straight porn until one link led him down a rabbit hole of videos and stories about guys like him getting turned out. The words "straight man gay sex" kept popping up, and instead of clicking away, he lingered. His cock got hard reading about some married dude on his knees for the first time. He told himself it was just fantasy, but the more he read, the more his hand pumped his dick thinking about a thick cock stretching his mouth or pushing into his ass.
It stayed fantasy until the night at the hotel bar after a work trip. He was three beers in when a guy named Derek sat next to him. Derek was built solid, short beard, direct eyes. They talked sports at first, then the conversation shifted when Derek asked if Mark had ever been curious. Mark laughed it off, but his face burned and his dick twitched in his pants. Derek didn't push, just slid his room key across the bar and said, "Room 412. Door's unlocked if you change your mind."
Mark sat there another twenty minutes, cock half-hard, before he stood up and went upstairs. He told himself he was just going to talk, maybe watch some game. But when he pushed open the door, Derek was already naked on the bed, stroking a fat seven-inch cock. "Strip," Derek said, voice low and rough. Mark's hands shook as he pulled off his clothes. His own dick stood straight out, leaking at the tip.
Derek got off the bed and walked over. He grabbed Mark's cock first, giving it a firm stroke. "Nice piece for a straight guy," he said. Then he dropped to his knees and swallowed Mark down in one go. Mark groaned, hips jerking forward. Derek's mouth was hot and wet, sucking hard while his tongue worked the underside. Mark had never felt anything like it. He grabbed Derek's head and started fucking his throat, dirty words spilling out. "Fuck, suck that cock. Take it deeper, you fucking slut."
Derek pulled off with a wet pop and stood up. "Your turn." Mark hesitated for half a second before sinking down. Derek's cock smelled musky and clean. Mark opened his mouth and took the head in. It tasted different, saltier, thicker on his tongue. He gagged at first but kept going, bobbing his head, getting sloppy with spit. Derek grabbed his hair and thrust deeper. "That's it, straight boy. Choke on it. You're good at this already."
They moved to the bed. Derek pushed Mark onto his back and spread his legs. He licked Mark's balls, then lower, tongue pressing against his hole. Mark's whole body jerked. "What the fuck," he muttered, but he didn't stop him. Derek's tongue pushed inside, getting him wet and open. Then a finger followed, then two, working lube in deep. Mark's cock leaked onto his stomach the whole time.
When Derek lined up his cock and pushed in, Mark gritted his teeth. It burned at first, stretching him wide. Derek went slow, inch by inch, until he was balls deep. "Tight straight ass," he growled. Then he started fucking. Hard, steady strokes that made Mark's hole grip and flutter. Mark reached down and jerked his own cock in time with the thrusts. "Fuck me harder," he said, voice raw. "Use that hole."
Derek flipped him onto his stomach and mounted him again, pounding deep. The slap of skin filled the room. Mark pushed back, meeting every thrust. His prostate lit up with every stroke until he was moaning like a whore. Derek reached under and stroked Mark's cock while he fucked him. "Gonna cum in this straight ass," he warned. Mark just grunted and pushed back harder.
Derek came first, flooding Mark's hole with hot spurts. The feeling pushed Mark over the edge. He shot thick ropes onto the sheets, ass clenching around Derek's pulsing cock. They stayed locked together, breathing hard, cum leaking out around Derek's softening dick.
Later, after they cleaned up, Mark lay there staring at the ceiling. He had crossed the line. His ass felt used and sore, and his cock was already twitching again thinking about round two. Derek lit a cigarette and offered one. "You coming back tomorrow night?" he asked.
Mark took the cigarette. "Yeah," he said. "I'm coming back." The stories had been right. Once a straight man tried gay sex, he didn't go back to pretending.
