Goddess Kiffa was angered to learn that she had an unruly slave and that she had to make him change his ways. The mistress did this by forcing him to lick her sneakers as well as endure her trampling. He was in pain and he was humiliated as well. And it served him right because she had repeatedly told him how she did not want him to be untidy in her house.
Goddess Kiffa had beef with her boyfriend and she did not let him get away without any punishment. The mistress had to make sure that her boyfriend would never be salivating at other women the way he was and also trying to sext them. So she used her sneakers to trample him as she found his actions deeply offensive but he was trying to justify them and that pissed her even more.