It seems to me, from what you say, that your boyfriend would be into fulfilling your fantasies-only for some reason he is not so sure that it's all OK. have a nice talk with him in an intimate seductive environment while your are not having sex. Tell him what you like, what you want to try and ask what he likes and wants to try. Anything between consenting adults is fair game. Just use mature judgement and be aware of the risks.
There are plenty websites about this sort of sexuality you might try these two:
http://www.xeromag.com/fvbdsm.html
http://www.sexuality.org/index.html
Many people have these fantasies, but seem to be afraid to express them to their partners. I am sure that if your guy is like most once he knows what you want and that there is n othing wrong with liking it he will be ecstatic, and so will you.
Best wishes,
dlb