I figured if anyone could help me, it might be /d/. I'm trying to initiate Tease and Denial in my relationship with my male sub, and I've gone so far to buy a chastity device but I'm running into some problems.

Basically, he cums too easily. He likes the idea of T&D but anytime after the first 48 hours, if he's teased for too long, he cums. He's stated he can also cum on command, back when he used to be a gamer on World of Warcraft and didn't have time to play the game and with himself, so he would cum to reduce his desire(is this normal?). He can also cum with the chastity device on, although I'm not sure how he manages to do that.

Any tips on trying to either reduce his sensitivity or stop his ability to stop the mind>body cumming?