I actually had a similar fantasy to this- from the other side- myself until couple weeks ago when it really happened. I was in the adult theatre and standing at a cubicle doorway watching a gay porn movie. some guys were fucking outdoors in a field which is my fave thing. I had my cock out of course masturbating and this cubicle had a glory hole. I felt something against my leg and looked down at a nice thick cut cock poking through the hole. 'Cool ' I thought, 'Someone to play with!' So I started stroking it as well as mine and then turned and rubbed our cocks together and masturbated them together too. After a bit the cock withdrew and a mouth appeared... so I stuck my cock in! He sucked me for a while then the mouth went and something tighter was against my cock! OMG its his asshole. I pushed gently but firmly and popped inside. I fucked this hot stranger, bareback for a while, then again his ass popped off and went away. I heard the door opening next door, and he appeared at my open doorway. ( it was open the whole time!) He ripped his jeans down and bent over in front of me. Who was I to refuse an invite like that? I slide my cock inside him and we fucked right there in the hallway, bareback, with three other guys watching and wanking. eventually he groaned and I felt his anus clench as he came and shot his load on the floor, the tightness sent me over the edge too and I filled his ass with my cumm. I let go of his hips and he turned and kissed me on the lips and said 'thanks!' pulled his pants up and wandered back to the movie room. I went back to my movie but as usual didnt pull my pants up at all!