This guy had tried to bully this mistress but she was not going to let him get away with what he had done. She had to deal with him in a way he would never forget and that is why she settled on using shit. He wished he had never bullied her as what she did to him was worse than he had ever experienced and he had a taste of his own medicine.
Mistress Annabelle had a score to settle with this guy and she did it with her shit. She wanted to do it in a way he would never forget and that is why she went out of her way to make him eat her shit. She did not give him any chance to refuse the punishment and she made understand that if he disobeyed her he would pay a heavy price.
When this mistress noticed that she was being taken for granted by this loser, she knew she had to do something to ensure he learned his lesson. And that is why she went out of her way to make him eat her shit as well as drink her pee. She wanted to send a strong message and her shit was able to do it for her. He never forgot it.