Mistress Oksana wanted to show off her hot ass and she did it after she had smeared shit all over her ass. She wanted to make this guy admire her ass and be scared of her at the same time and that is exactly what happened. It was a lot of fun for her and she enjoyed doing it. The guy never saw it coming and he learned his lesson the hard way.
When mistress Oksana realized that she was dealing with a guy who was not accountable and did not want to take any accountability for his actions, she had to dominate him and to torture him for what he had done. That is why she turned the shit into a weapon and she had to degrade him and use it to make him stop being unaccountable. It worked as well as she wanted it to.
This guy tried to blackmail mistress Oksana but he regretted it almost immediately as she turned him into a shit slave and she fed him her poo. He had to eat her shit and also drink her pee before she was done with him. He wished that he had not tried it as he had brought the degradation on himself with what he had tried to do to the mistress.