A super mean orgasm control

The beautiful mistress has devised a very nasty game for her 24/7 slave. First she frees him from his chastity cage, where he has to keep the locked cock rings on to put more pressure on his fat balls and then he gets an extremely nasty orgasm control. When the poor guy is then allowed to lick his mistress's ass and pussy, he can only pray and beg to get his redeeming orgasm, but what is he going to do so defencelessly in the strict bondage against his mistress's nasty play?