Lady Scarlet needed to teach this old loser a lesson and she felt that the harder and more painful it was the better. That is why she chose to kick him all over and to concentrate on his nuts. He cried as she did her thing on him and he wished that he had never pissed her off as the pain was out of this world for him. But there was no way out of it.
Lady Scarlet and her friends had worked hard for their money and now that they had it, they had to celebrate a little. And they chose to do it by hiring an entertainer. The mistress got one and paid him but he was boring and he nearly killed the vibe they had. They had to turn the party into a humiliation and ballbusting session for him so as to salvage the night.
This guy needed to be ballbusted because of his nonsense and lady Scarlet engineered that to happen. The mistress went ahead to let her friends know what the guy had done and why he had to be punished. So the three of them ballbusted him and there was nothing he could do about it as they enjoyed torturing him for their own fun. He cried but that did not make them stop.