Have many, but have always wanted to join a bi couple in their house, where the husband would tell me that his wife wants to be impregnated, but he can't get hard enough with out another man. Then he would tell me that he wanted me to fuck his wife first, so he could watch my ass as I fucked her. Having always enjoyed watching another guy fuck a woman, I'd understand and oblige. As I would be fucking her, he'd come from behind, grab my nipples, and start fucking me. I would tell him that I would cum if he didn't start, and his wife would beg him to stop before I impregnated her. He would just squeeze my nipples harder and tell me to give her what she wants, cause he doesn't want any children. Just then I'd start cumming like a mad man, while he'd then start breeding my ass, telling me that that's all he wanted. When every thing was done, a week later I would receive the call telling me that I was going to be a father, and re-inviting me over for more fun.