Madame Ellen ensured that this slave was as humiliated as she wanted him to be. She took a used condom and she had him drink the contents. He was tied up so that he did not resist what she did. The mistress had an easy time degrading him and he could not do anything about it. He was also crushed on his dick by the mistress using her high heels.
Madame Ellen did not agree with a lot of what this professor and she had to give him her opinion. She told him that she was not one of his students and he could not control her and others. So she used dirt to punish him as he had to lick the dirt and he had to chew and eat some of it for her own pleasure and as punishment for him.
Madame Ellen knew that a scared loser was a good person to have because he would do just about anything you asked them to do. And that is why she used a plastic bag to choke him and humiliate him. He was scared shitless and she knew she had managed to get him in the state in which she wanted him. He never failed to obey her and carry out her instructions.