as you know the best way to tame and train a male creature is CBT
the Cock and Ball is the right and the best place for torturing a man
what torture can you imagine (even fantastic) to train and make a man submissive fast and truly.
a way I can imagine is just branding his cock or ball once with a branding iron
i think if a mistress do it to her male slave.every time he remember the pain and humiliating memory,he can not disobey his owner
what do you think?