This guy was horny after he had seen this mistress' sexy ass. He wanted a piece of it but he did not know that the mistress loved to turn such guys into her playthings. That is why she chose to turn him into an ass licker and a shit eater. He had no choice but to eat her poop and to drink her urine. He was more cautious next time he saw fine booty.
This mistress had explained her situation but this debt collector was still sent to her. She was pissed and she had to do something about it. The mistress felt that she had to punish him because what he did constituted harassment and she was not going to let anyone harass her. The guy was forced to eat shit and that was how he learned to be more understanding of situations like hers.
This mistress does not take betrayal kindly and when she learned that this guy had betrayed her, she had to deal with him. She had to make sure it was the last time he was betraying someone so she used her shit to punish him. He had to eat her shit and swallow it and it was the most degrading thing he had ever done. But he learned his lesson.