Fetish to bed?

Okay so my boyfriend and I know about each others kinks. Mine is a bit bizarre and I want to bring it to bed but when we have sex. Issue is that he comes to quick and we don't get to enjoy the good stuff. Only thing that will make him last longer is if I am being dominant and give him what he wants, but I'd like to be dominated also. Our sex is great just wish it lasted longer and we got to incorporate things for each other. I don't know how to tell him he's kind of sensitive