One of the big erotic attractions in Mind Control is that the controller gets to have all his desires met without the risk of having to come out and ask for them. It's total power with no responsibility.

Probably the most common story device for MC is hypnotism, and I could see your BF being a master hypnotist and you his assistant, luring attractive young ladies backstage after his shows for all sort of perverse pleasures. Maybe one of these girls is the virginal daughter of his arch nemesis and your BF's out for revenge. You can do all sorts of wonderful stuff with post-hypnotic suggestion too, like making people have sex in public or turning sweet, young things into raging sluts.

Another good device are drugs. A little sprinkled on someone's food or in their wine and they're yours to command.

In any case, I wouldn't worry too much about overall plot. Go with the hypnotism thing and you can just do whatever you want with anyone. It's all fantasy anyhow.

---dr.M.