When this mistress realized that this guy was inconsistent, she had to do things to him that she did not do to and with anyone else. The mistress felt that she had to turn the guy into an example for the others who would be as inconsistent as he was. That is why she had to make it as cruel as possible. The mistress did that by cruelly ballbusting the guy.
When this mistress caught her husband cheating, she had to do what was required to handle the situation. She was hurt deeply and she had to make sure that he also felt a measure of pain. She did not want to be the only one hurting. That is why she went out of her way to ballbust him and to crush his nuts with her kicks. The pain was out of this world and he never cheated again.
This mistress was interested in finding out how high her slave's pain threshold was. She had to test him and so she tied him up and she slapped him in the nuts. In addition, she kicked him and as he cried, she got the answer she was looking for and frankly, she was expecting more from him than he had shown her. She let him go and told him to improve.