Here's mine: I had sex with a photographer and another female model on my first ever photo shoot. Here's how it went down. I answered a "models wanted" ad, and was invited to a big studio/loft. I met the photographer and a couple of the other models and they were all super cool. I did some test pictures and was ready to do my first bikini pics. In the changing room this other model, a fucking hottie with pink and green hair comes in, and starts complimenting me on my looks. She started touching me and I got horny right away. We went into the back room and got naked and started making out. The photographer comes in, sees us, and just watches. He was 40 something and enjoying the show I guess. I tried to join but we both pushed him away a few times which really must have teased him to no end. Finally we said come join us and we had a threesome.
Looking back on it I think I was probably set-up because when I watched them fuck it looked like they had fucked before. When he fucked me the other girl was grinning from ear to ear. I don't care though, I had a blast.