I don't think it's unusual for people in your position to have an inner desire to be dominated.

This is just a suggestion and everyone is more than able to disagree. I'd write him a letter, a detailed letter, outlining your deep fantasies, almost like one of our stories. You have obviously thought about it (your fantasies I mean). Suggest a weekend or evening session wherein you are gagged and unable to to object. As long as you have been together you already know that you can trust him. Make it an experiment...if you don't like it, you don't have to do it again...and agree not to hold it against him after. Just from reading your original post...I have a feeling you'll be asking for more soon.

Discuss the whole scenario in advance and then make yourselves wait a week or two to fulfill it. The anticipation will be killing you!

Have fun..please keep us posted