Girl is into pain and electricity: finding out how many volts male slave can handle in his wired penis without passing out
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
Naked guy is wearing cock cage and his balls are bitten with clothespins during the fem dom education lesson