Stepdad's mate is always wanking! Do I satisfy him

My stepfather's boyfriend is really cheeky. He's allowed to spend the night at our house anyway, but then he has no shame at all and walks around wanking everywhere, so he can't even do it secretly under the covers! I wanted to talk to him about it all the time, but didn't know how because I found it kind of tempting and when I wanted to go out one evening with my boyfriend, I finally got over it. But the whole thing took a rapid turn. I'm afraid he had already realised what I was getting at and before I knew it I was lying between his legs. With his cock in my mouth! Good thing we were home alone at the time and good thing my dress was so tight. Suddenly I was already sitting on his hard thing and I rode him horny. He then gave me a really good going over and showed me that he can do more than just wanking =)