Watch and wank it to yourself!!!

I was invited to a frivolous party to which I took a friend. When we got there way too early, there was only one guy there. My companion and I were so horny for each other that we didn't want to wait and started before the other. I sucked his cock hard, he licked and fucked me properly... And I kept looking over at the guy, who was wanking his cock in the meantime. That made me even hornier. Was he allowed to join in? Would you have wanted to join in?