Raven Dom has her slave on the floor and she has a long and solid piece of shit that she needs to feed him and he's going to make sure to eat it all. She's been holding it for a while, so it's going to last a long time while it slides down his throat. He has to work really hard to get it all down but she doesn't let it stop.
Raven Dom wants to make sure that her human toilet eats every last drop of her shit, so she sits on top of a bucket to let it fall out of her body. Then she picks it right up and presses it hard into his mouth and makes sure it gets all the way down his throat. Then it's just a matter of making sure he swallows the whole thing.
When this professor learned that her student was not doing things the way she wanted and how they had spoken, she had to punish him. She chose to humiliate him and she chose to use her shit to do it. The mistress tied his hands so that he did not resist what she wanted to do to him. It happened the way she wanted and it was fun for her.
When this guy tried to do the kind of nonsense that he had done again, this mistress was not going to give him that chance again. She felt that he was taking advantage and for that, he had to be punished. That is why she chose to make him eat her shit. He was turned into a shit slave and he had to learn his lesson the hard way. He regretted his actions.