I was hired to make a video, not to do a threesome, but I liked it and now it's my job too

I've been working as a cameraman for several years, making videos of weddings, birthdays, events, meetings, but I've never done anything like that. a couple called me to ask for an intimate video, they told me to come home and talk quietly, I had very little work this week, so I went. they were a very young Asian couple. the girl was very sexy, we got along just in time. they said they wanted to make the video in the bedroom having sex, and I did. when he took off her clothes, I couldn't help getting an erection. I wanted to be the one to suck your body and touch your pussy. I was there, working, when I really wanted to have fun. she knew, i noticed that she was looking at me. I started to touch myself with my free hand. so i took my dick and started masturbating in front of them. so far it's video, because it was at that moment that I was invited to join the party.