I work in a well know hotel at Heathrow airport. On Wednesday night there were 5 of us doing the shift ( all guys ). At around 3am I took an order up to a room. After knocking on the door and waiting a while it was opened by a totally naked guy covering his bits with his hand. He invited me in to put the tray down. In the bed was a blonde chick sitting up with the sheet covering her tits. The guy had to sign for drinks and so he uncovered his cock to sign the bill. I looked down and I could not believe what I was seeing. His cock was rock hard and the biggest one I've ever seen. I've seen big ones in porn movies but this looked bigger. At a guess I'd say 10". After he had signed the bill I left and he followed me to the door, then he said " hang on one minute" and he walked over to his trousers on the chair. He was fumbling through his pockets and she got out the bed, totally naked and walked over to the tray I'd just bought in. She was such a stunner, slim body, blonde hair and massive tits. She was about 24 and he was about 28 years old. His accent was Dutch. I'm 20 by the way. He walked back towards me with his 10" hard cock pointing straight out at me and handed me a pound coin. I thanked them and left. My own cock was rock hard in my pants now after seeing that. I went back downstairs feeling so horny. About 10 minutes later the guy taking the room service orders called me over and said room 3011 rang again saying " please tell Andy to bring some ice up please", the guy in the room must have read my name badge. Well I filled a bucket with ice so fast and headed back up to the room with my cock really throbbing hard in my pants now. When I got to the door and knocked I noticed it had been left open. Not wide open, just not shut properly. The guy shouted out who is it and I replied " Andy from room service", and he said " come in". As I walked in the door clicked shut behind me, as they do. And there on the bed was the guy flat on his back with the chick on her knees on the bed sucking his cock. I just stood there holding the ice bucket and could not believe what I was seeing. The guy had a fat smile on his face looking at me while she sucked away at his cock. I put the ice bucket down and standing by the dressing table, directly behind her. She had her back to me in doggy position on the bed, one hand holding his cock and sucking, the other fingering her pussy. I watched this for what seemed like a long time then the guy moved off the bed and walked straight up to me, still smiling. He took a block of ice from the bucket and with her now flat on her back on the bed with her legs open, he started to rub the ice on her pussy. She was moaning and moving about also smiling at me. I had no idea what to do. Was I to just stand there and watch or what? He turned round to me and asked " is the door closed Andy?" I said yes, and he said " stay and watch if you like". With that he mounted her and started fucking her. I could not believe it when I saw she took the whole 10" of his cock. He was really bumping and grinding into her, fucking her fast then slow. I was standing rubbing my cock through my trousers, wanting to wank while I watched him fuck her but not sure if this was allowed or not. They moved around on the bed and got into doggy position and I finnaly moved from being stuck like glue on the spot to the side of them. Watching his long cock slide in and out of her. He reached out for my crotch. Now I've experienced this before once while watching a couple at a dogging site where the guy reached for my cock. I won't say I'm 100% straight because I am very curious and open minded, but have never actually done anything with a guy. Anyway, his hand was now on my cock bulge rubbing it so I undid my belt and opened my trousers taking my throbbing cock out and let him jerk at my cock all the while watching his cock slide in and out of her. I was still dead nervous and not sure what part I could play. He was making a good show of his cock, pulling it all the way out for me to see and then rambing it back home. He kept on doing this. By now he had let go of my cock and was really fucking her hard. She was screaming out so loud. I was standing there at the side of the bed watching jerking my cock off. I wanted to strip naked and join in, I wanted to fuck her too. I had been so close to cumming so many times in the last few minutes standing there. When suddenly everything hotted up and he was banging her really hard and fast and he started moaning out loud, I jerked off harder then ever and just then he pulled his cock out of her and started shooting cum all over her arse. Just seeing that got me to the point of no return and I shot my load all over the side of her arse and on the bed covers. They colapsed onto the bed with me just standing there with my cock still out dripping cum. The guy looked towards to me and said " thanks Andy, we'll see you later", and with that I got the message I must leave now. I spent the rest of the shift waiting to be asked back to room 3011. I even walked back to the room and had my ear against the door to listen but there was silence. I went home that morning and jerked off twice remembering my experience and on Thursday night at work I checked the house list and noticed the room was vacant. Damn! they had checked out. I've read so much about dogging and guys joining in on the action, but so far it's never happened to me. This was the closest I'd ever been to it. I'm glad it happened because now I know I am more than just a curious bisexual, I am bisexual. I've been thinking about his cock since then and been thinking about sucking it and being sucked off by a guy. I think that experience in room 3011 has changed me forever. There are lots of gay guys who work at the hotel and quite a few of them flirt with me. I go to gym with one of them and next time we are alone in the steam room I'm going to show him what he's been after for a long time. I want to experience sex with a guy now. I'm single and always horny so why not.