That is so very difficult, if not impossible, for me to say since i dont know the person at all. Therefor i dont think it a good idea for me to wing it. I think you know best yourself. Have you tried bringing it up in the bedroom while involved in a sex act? Tell him in the heat of the moment that you want him to tie you up or something. Like i said its impossible to give advice when i dont know that man. But all the best in your quest.

Ps. Really like your nickname.
~Sir Domin8or~