Mistress Anni had an issue with her boyfriend and she did not want to let things end without her humiliating him and punishing him for it. That is why she chose to trample him and turn him into a foot slave so that he would learn to fear her and to do things her way. Or at the very least consult her before he did things. She did not want to be ignored.
This guy bought himself a ticket to being trampled and turned into a foot slave when he messed with mistress Anni. He misbehaved and she knew that she was not going to let it slide. So she did what she does best and she used her foot fetish to torture him. He was in greatly humiliated as the mistress forced him to lick her feet and to suck her toes.