I love rimming, both giving and receiving, and as I have a string submissive streak in me, having to lay back and have my husband or girlfriend squat over me adds extra spice to the act, plus it means I can get my tongue deeper inside.
Plenty of men enjoy submitting to their partner, but often don't want to admit this, as they fear it will make them seem weak. In reality, all they're doing is admitting what really excites them the most.
If your case, I think you get a sexual thrill from having him under your control, even if you've never consciously thought about it in such terms. The feeling is exquisite, and the thought of being able to control the activity adds an extra dimension. He obviously loves it, or he would have asked to change position long ago. It sounds to me like you're both enjoying a very satisfying and exciting love making. Always talk openly and honestly to each other, as there's always more ways you can enjoy sex together, the only limit is your imagination, as everything is possible if you both want it.
Happy love making and a very happy future to you both.