Mistress Zephy had tried to teach this guy to foot worship her but he did not do it as well as she wanted. So she had to come up with an alternative way to do it. That is why the mistress chose to use her high heels to crush his balls and to force him to lick the soles so that he could learn his lesson and do it her way.
Mistress Zephy felt that she needed to dominate this guy and she did it for fun to this guy. She used her foot worship fetish to do it. The poor guy did not know what he had done to deserve the treatment and she did not bother to explain it to him as she felt that it did not matter as she was already doing what she wanted to him.
Mistress Zephy had beef with her professor as she felt that he was not grading her correctly. He was scared of anyone finding out about their relationship that he overcompensated by being strict and hard on her and even making sure she did not get exceptional grades to raise suspicion even though she deserved them. The mistress had to make him take it easy and stop overcompensating. He was made to lick her feet for him to realize that she was serious.
This guy was strong and had a well built body. Many people feared him but mistress Zephy did not. And to show that she was more powerful than him, she secretly recorded how she made him a foot slave. He had to lick her feet and endure being choked a little using her feet. He had to beg her to stop humiliating him and she did after she made him jerk off using flip flops.
Mistress Zephy had a new slave but he was so arrogant that she could not just look the other way. She had to make sure she punished the guy for what he had done so that he would drop his arrogance. She did not want such a person in her house and so she punished him when he was naked for him to feel as much pain as he could.
When this guy eavesdropped on mistress Zephy, he did not know the kind of shit he had put himself in. The mistress had to find a way to dominate him and she did it with her foot worship fetish. She had him lick the soles of her boots and when he was done, he had to do the same to her bare feet before she trampled him and chased him away.