Lady Sarah wanted to show this guy that she was not a pushover and she could punish him painfully and cruelly if he did not change. So the mistress stripped him naked and she had him tied to a tree before she kicked him in the nuts repeatedly. He cried and screamed as she ballbusted him and he tried to get her forgiveness but she did not listen to him.
Lady Sarah likes to have her peace and quiet. But her slave was a nuisance and she did not let lady Sarah have her peace and quiet. She had to find a way to deal with her and she settled on whipping her while she knelt and while she licked her boots. That was to send a message to her that she could not get away with mistakes in her house.