Goddess Kiffa needed to smother this slave and she did out of anger. She had no more fucks to give and that is why she chose to use her boots to trample the shit out of him. As he felt the pain and the humiliation, he begged her for mercy before requesting her to give her one more chance and that she would make amends. The mistress ignored him and went on humiliating him.
Goddess Kiffa was shocked that this guy was a chef but he cooked low quality food and she was not impressed. She had to make him research on the best way to cook the kinds of food she wanted. And that is how she turned him into a foot slave and had him lick her shoes and endure her trampling. He was both in pain and humiliated at the same time.
Goddess Kiffa is the kind of girl who loves to humiliate losers to set them straight and make them change instead of doing it for fun. So as she worked out today, she knew that she had to punish her slave when she was done. She settled on using her sweat to do it so he was summoned and had to lick her sweat when she was done working out.