Hi, understand you perfectly. I'm a big and normally dominant man but I have found actually I'm much more of a switch. So much like you we needed to find away to aid my feeling of being dominated.
Being a man an big and strong if you can remove the physical aspect then suddenly it much more easy to do. So we bought under bed restraints. Once I was spread eagled on the bed and blindfolded I felt very vulnerable.
What happened next really caught be by surprise. You don't need to do much because you have complete control..
Try some sensory play. But don't let him see it before. Have a bag ready. Candle wax dripped on nipples and torso , ice , silk or cloth, feathers. Don't rush drag them across his body. Enjoy watching him wriggle and squirm. Stay away from his penis allow the feather or scarf to run over it occasionally.
What your doing is teasing or edging him. If he moans or trys to talk to asking you to do something. Then an easy but very dominating thing to do is say be quiet , you asked for this now behave. Cover his mouth momentarily saying sssshhhhh. I'm enjoying myself.
A very good thing to do is get off the bed and stand still. What will be is seconds to you will seem like minutes to him. Sensory deprivation is a very interesting thing. Very quickly he will ask what are you doing and your being dominant with out doing a damn thing. Just say wait and see . his mind will race.
If you have the time and patients, smell and taste are highted in this state. So have some chocolate spread ,honey and syrup you can dip your finger in and tease him to suck it off. Change tact and put it on your nipple an offer it to his mouth.
Finally finger yourself if your nice and wet its good. Coat your fingers let him just smell your scent then let him lick your fingers.
Give a bj with ice in your mouth.
Ultimately squat over his face just high enough to let him lick you . occasionally lift away or lower onto his mouth.
Finaily take his cum by riding him hard . telling him You want his cum in you now.
Ifhe can stand it try some nipple clamps