Mistress Lilli does not like slow people and when she noticed that her new slave was slow, she had to punish him and she did so with her sandals. She cruelly did it in a way that he would not forget. She did this because she wanted him to make the necessary changes and he did so. The mistress enjoyed herself a great deal and she got what she wanted which was to change him.
Mistress Lilli needed her slave to change and she knew that the best way for that to happen was for her to dominate this slave and do it in a way that he would never forget. So she did it without thinking twice about it and it worked out the way she wanted it to. As he struggled to breathe, he realized that she was right and he changed his ways.