This guy was a bully and he needed to be punished for what he had done. That is why this mistress had to dominate him and why she did not feel any pity for him. He had to get a taste of what he did to others and she did not hesitate to use the chastity key to dominate him. He was naked and tied down before she did her thing on him.
Mistress Dula likes to make people fear her and this guy had to fear her after she had turned him into a human dog. She made sure he was naked and she then made him fetch things like a dog. The guy had to drink water she had spat out and he had to do a lot of humiliating things before she felt that she had done enough to him.
Mistress Dula needed to kick this guy because he was a liar. So she kicked him in the nuts because that was when he would learn never to piss her off. The mistress did not want him to think it was ok to lie to her and she certainly did not want him to think that he could get away with it. So she took him to an abandoned house and kicked him in the dick and balls.