Mistress Lena used her feet to give this guy a taste of his own medicine. He was a bully and had been warned to stop but he did not. He assumed that everyone was scared of him but he was shocked that mistress Lena did not fear him and in fact, she degraded him and made him lick her feet and suck her toes to send a message that he needed to stop bullying or it would get worse for him.
This guy was a sissy and mistress Lena loved to scare the shit out of him. Ever since she learned that he got scared easily, she has made it her mission to have fun at his expense. Today she invited him to her house and he went not because he wanted but because he feared her and what she could do if he did not go. When he got there, she threatened him with her heels and that is how he licked her feet and soles.
Mistress Lena had never done anything with her bare feet but she was able to do so today. The mistress did not know that it was possible to humiliate and dominate a guy using her bare feet. She tried it today and it was oddly satisfying for her and it was degrading as well as humiliating for the loser she was humiliating. She added it to the menu of her humiliations.
Mistress Lena noticed her slave had messed up and she was not ready for any excuses. She came ready for a fight and that is what made her use her boots to force her slave to do humiliating things. He was not even allowed to explain himself but to only do what she wanted him to do. The angry and cruel mistress degraded him like he had never been degraded before.