We were two straight guys who never thought twice about it. Mark and I had been friends since college, both married, both into women, both the type to crack jokes about anything gay. That night after the bar we crashed at his place because his wife was out of town. We were drunk, horny, and bored. Mark flipped on the TV and put on some straight porn. Two chicks going at it, tits bouncing, pussies spread. We both had our dicks out in our hands within minutes, stroking slow and talking shit about the girls on screen.
"Fuck, look at that ass," Mark said, his fist pumping his thick cock. I glanced over.

His dick was bigger than mine, veiny and hard, the head already leaking. I kept stroking mine and told him the blonde looked like she needed a real cock. We kept watching, but the porn switched to a guy eating a girl out. Mark shifted on the couch, his leg bumping mine.
Then he said it, low and rough. "Ever wonder what it feels like to have a guy suck you off? Just to see."
I laughed at first, called him a fag. But my cock twitched hard in my hand. He wasn't joking. Mark leaned over, grabbed my dick, and wrapped his lips around the head before I could stop him. It felt hotter than any blowjob I'd had. Wet, tight, his tongue working the underside while he sucked me down. I groaned and pushed my hips up, feeding him more. "Suck it, man. Fuck, that feels good."
Mark went at it like he was starving. He bobbed his head, taking me deep, gagging a little when I hit the back of his throat. Spit ran down my balls. I reached over and grabbed his cock. It was rock hard and burning hot in my fist. I jerked him while he blew me, both of us breathing heavy and grunting like animals.
"Switch," he said after a minute. He pulled off my cock and stood up, pushing his pants all the way down. I got on my knees without thinking. His cock slapped my face. I opened my mouth and took him in. The taste was salty and male, different from pussy but not bad. I sucked hard, hollowing my cheeks, one hand stroking the base while my other hand reached around to squeeze his ass. Mark fucked my mouth, hips snapping forward. "Yeah, take that dick. Suck it like you mean it."
We were both straight, but right then we didn't give a fuck. I wanted to make him come. He pulled me up, spun me around, and bent me over the arm of the couch. "You ever get fucked?" he asked, voice thick.
"No," I said. My heart was pounding. "But do it."
Mark spit on his fingers and rubbed them over my hole. It felt weird at first, then one finger pushed inside. He worked it in and out, stretching me. Two fingers followed. The burn turned into something hotter when he found that spot inside me. My cock leaked onto the couch cushion. "Fuck me already," I growled.
He lined up and pushed his cock against my hole. The head popped in and I grunted loud. It hurt, but he kept pressing, inch by inch, until his balls rested against me. Full. Stretched. He started thrusting, slow at first then harder. Skin slapped skin. His cock dragged over that spot again and again until I was pushing back, meeting every stroke. "Pound me, man. Fuck my ass."
Mark grabbed my hips and railed me. Deep, dirty strokes, his cock owning my hole. I reached down and jerked my own dick in time with his thrusts. We were both straight guys, but we were fucking like we needed it. Sweat dripped. He leaned over my back, biting my shoulder while he slammed in. "Your ass is so fucking tight. Gonna fill you up."
He came first, cock pulsing, hot cum flooding my insides. That pushed me over. I shot all over the couch, thick ropes while he kept thrusting through his orgasm. We stayed locked together for a minute, breathing hard, his cum leaking out around his cock.
We didn't talk much after. Just cleaned up, drank water, and crashed. In the morning we both acted like nothing happened, but we knew. Straight men don't usually end up with another guy's load in their ass. We never told our wives. But a week later Mark texted me: "Wife's gone again. You coming over?" I was already hard before I replied yes.