Goddess Antonella felt that this guy was misbehaving and that his behavior was shitty. She felt that the only way to show him how he was behaving and make him realize that he had to stop it was to shit on him. The mistress did not hesitate to turn him into her human toilet and not only shit on him, but also make him eat her shit and drink her urine.
Goddess Antonella wanted her shit eaten but she did not know how to go about it. She did not want to have a slave do it because she was not sure whether she would like it enough to necessitate the use of a full time slave. So she paid this guy to eat her shit because she knew he was broke and would not resist it. And that way, she would have a chance to find out whether she liked it enough to get her own slave.