I'm an amateur model who poses nude but here I want to describe a weird recent experience that had nothing to do with my own nudity. The guy who hired me asked me to stay clothed in the t-shirt and jeans I wore to his studio. He and his young assistant were the naked ones which I thought was an amusing surprise. The photographer's assistant was nude with a half boner when he opened the door and his boss was taking off his trousers to greet my arrival. Not bad looking guys, both fit and body shaved. I quickly realised that they wanted to have sex with other while I watched. The photographer really did photograph me while the assistant fondled and sucked his cock. Every now and again, they'd pause to neck together which I usually think is yucky between men but the atmosphere being what it was, it turned me on wetly you know where. I wanted to get nude myself as women do in sexy situations but I didn't like to until the photographer called out to me to strip if I felt like it. At that point the photography stopped. We were all naked now and hot. The assistant called the photographer a naughty boy who deserved to be spanked and pulled him across his knee. Once the photographer had a nice red bottom, they switched positions and the assistant was spanked. Are you going to fuck, I asked. The photographer lay down on the floor on his back and took the assistant between his spread legs and put the kid's cock up his ass. I've never seen guys fucking each other and naturally I'm masturbating hard while I watch them. I pick up the camera and start photographing them. The photographer was loving acting the woman's part making the same sort of noises a woman does when a guy is thrusting a big boner up her cunt. It was only as I was leaving that I overheard the young guy say to the other one “that was great, dad.” That really blew my mind.