Mistress is having her lover strapped to bed posts and tormenting his balls with clothespins and steel device
Male is handcuffed and having a weight attached to his balls: whipped by girl in the sound-proof chamber
Hot dominatrix is having her slave handcuffed and using weird tool to pu tight rubber bands over his balls
The worst femdom tortures you can imagine: hitting weak penis with mouse trap and then cutting off balls with castrating device