Lady Victoria needed to pass a message to this guy and she chose to humiliate him with her great femdom fetish. The mistress did not want it to be an easy thing for him so she did it the hardest way she could. That involved using her boots to trample as well as to torture him and he was in pain as well as felt a lot of humiliation from her.
Mistress Medea was out to control this guy and she knew that the best way to do it was to use her control over him to torture as well as humiliate him. That is why she used her anger to do it. He was asked to lick her saliva as well as to lick her dirty feet and he had no alternative but to do as the mistress had ordered him. And from how he was scared of her, she had an easy time controlling him.
This mistress had to punish her ex because she did not like how he had been deceiving her prior to their breakup. She could not believe that almost everything about him was a lie. So she used her ass to punish him. He had to lick her asshole and he had to smell her farts as well. She made sure that he did and that is how he learned never to be a liar.