Princess Scarlet wanted this lazy slave to change his ways. She felt it was not worth it for her to have him around and so she used her shit as well as her pee to dominate him. The slave was degraded by what she did but there was nothing he could do about it and he had to change if he wanted to avoid what she had done to him.
Lady Scarlet was horrified to realize that she had missing marks and so she went to her professor to complain. But instead of correcting the mistake, he tried to make her sweet talk him. But she was not going to agree to sleep with him for a grade she had earned through hard work. So she made him eat her shit to realize how serious she was about the whole thing.