Mistress Iside likes to know people's pain thresholds as she works with them because it shows her and it tells her how to deal with them in the event that they piss her off or she needs to torture them. So the mistress tied this one up and she used her boots to ballbust this guy and make him feel pain that he had only heard about up until that point.
Mistress Iside values loyalty and that is why she was pissed when her slave backstabbed her. She could not reconcile all that she had done for him with what he had done for her. The mistress had to find a way to deal with him and she did so using her ballbusting fetish. He was stripped naked and kicked so hard in the butt that he nearly shit his pants.
When this guy intruded into mistress Iside's property, he was not even remorseful when she caught him. He did not look scared or threatened because she was a girl and that pissed her even more. She used her martial arts skills to kick him and pin him down before stripping him naked and tying him up. Then she ballbusted him and made him regret his choice not to run away.
Mistress Iside did not like how her brother in law tried to seduce her and fuck her. She was pissed because he did not respect her or his own brother. She did not tell her husband but she kicked the balls of the brother in law and made him realize that she was not someone to mess around with. And she warned him that she had more punishments if he did not behave.
Lying is one of the things mistress Iside cannot tolerate. This slave was a serial liar and this mistress knew that she had to tame him. So the mistress used her fetish for ball torture to tame him and each him a lesson he had never learned before but one which he needed to learn. She stripped him naked and she kicked him in the balls and also on his dick.
Mistress Iside caught this guy spying on her and she asked him why he was doing it but he took her for a fool and did not tell her what she wanted to know. He tried to evade her questions and pissed her off in the process. That made her angrier and she used her boots to ballbust him to teach him never to do that again. He never spied again.