Hiya Rosie

I agree with slo18, and for my penny's worth any type of BDSM "play"
you have to trust your partner/mistress/master

do you have a safty system in place

have you disscussed what you would like and dislike

never "Play" when there's bad feelings, as you know, it may get out of hand

before starting any "play" you must talk honstly, some partners find it difficuilt to give to others what they want, and need time to get there heads round it. May be he can't bringing himself to be that part you desire all I can say is spend plenty of time over a bottle of wine and a relaxed atmostpher and talk, maybe you'll come up with something you both like

hope you both work things out and have fun doing so,

all the best
take care
bearbeast