This mistress had to control and humiliate this guy because he had been a pain in the ass for her. She did not like it and it was important for her to punish him and teach him to do things her way. That is why it was important for her to whip him and why she did it as painfully as she was able to do it. He never forgot it.
This guy was tied down in an upside down position and then whipped and ball crushed. He had pissed off the mistress and she was so mad at him that she had to do it mercilessly. She had to make sure that he learned his lesson and that he learned it the hard way. That is why she opted to make sure he was in the pain of his life.
Lady Sonya, madame Carla and mistress Daisy felt that they had to dominate as well as torture this guy and they did it in a painful and cruel way. The guy never saw it coming. He was shocked as he was tied while naked and he was whipped all over his body. He was bruised and in a lot of pain but the mistresses did not care about what he felt.