Mistress Anna was not amused by how rude her slave was. She had tried to make him change but she did not get anywhere with her punishment. She had to try something different so she used her poo to get him to realize she would not tolerate his rudeness any longer. She turned him into a human toilet and as he ate her shit, he realized that if he did not change, he would get cruelly humiliated and degraded. So he changed.