Do you have a strapon? time to make introduce it!
If you don't own a strapon then explain that you're going to offer him a choice. He can either be released while still blindfolded and ride a buttplug until it will slip inside himself whilst you hold it steady on the floor... or do a forfeit (see next page)
While pursuing non vanilla sex you both will try a lot of new things. I think its time for him to try sucking cock.
Alot of BDSM artists use this as a way to humiliate a guy. THAT IS NOT!!! WHAT WE ARE GOING TO DO.
Do not be the least bit insulting during this phase. Don't even make jokes. And remember, you will undoubtedly go through a lot of embarrassing stuff both in and out of the bedroom so don't joke or make insults later either.
Instead think about how much courage it must take for a man to play this game. Men aren't like women, they have to be masculine all the time. Women get to be feminine when they want and masculine when they want. This takes A LOT of trust. And if your man is the one who showed you this lesson and not the other way around, he is even braver.