A reasonably priced three-piece set of a metal ring gag and nipple clippers plus an eye mask!
Humiliation by being gagged with an O-ring and pinched at the nipples!
Having him ooze unutterable voice with saliva dribbling from the mouth will arouse you more.
Also using the eye mask will added to the sense of humiliation!

You can adjust the tightness of the nipple clipper with a tab on it.
The colored pattern of the eye mask is randomly prepared.