My quick thinking was to get him pretty excited by stroking him, but at the same time pushing my penis up his ass, insuring he wouldn't cum, but would just get close to cumming. I got behind him, my penis lathered and stiff and I pushed it against his asshole. Reaching around him, I grasped his dick and started to stroke it at a pretty fast pace, while slowly pushing my dickhead into his ass. I didn't want him to cum from the stroking or the pressure of my penis in his ass too quickly, that would ruin the fun. Somehow I got him bent down over a machine so that my dick lined up pretty right with his asshole, and I pushed it all the way into him. Yes, it was tight. And my maleness told me to plummet him in and out as often as I could while I still stroked his penis as slowly as I could. It really didn't take long: I could feel my cum boiling up from my balls, and I grabbed one of his hands and placed it inbetween us, directly on my balls as I felt my cum coming up. Generally I won't shove totally the way in to come but this time I felt like it. I felt my orgasm coming 15 seconds before I actually came, so I pushed my penis way up in his ass and, stroking him vigorously, he shot all over my hand. I shot totally into his butt, taking up thrusting again to insure his ass was thoughly fucked.