Mistress is using balls destruction as a way to stop that man from jerking off: spread-eagle bondage, balls beating and trampling are doing the job fine
Guy got his cock in the glory hole but girl bondaged it with thin wire instead of giving up a blowjob
Bitch in fishnets is having masked male exposed on BDSM cross: tormenting his manhood with small harness and a whip
The worst femdom tortures you can imagine: hitting weak penis with mouse trap and then cutting off balls with castrating device