Mistress Natasha did not like how this slave had an attitude. She felt that she had to make sure things were better and that is why she chose to dominate as well as humiliate him. The mistress went ahead to force the loser to lick her soles which she had made sure were dirty for that purpose. And as he licked them, she warned him of worse things like ball busting him.
Mistress Natasha felt that her colleague was becoming unruly and she did not want to work with someone like that. She had to do everything in her power to make sure it all ended up the way she wanted. So the mistress forced the loser to do what she asked and when he did not, she used her sneakers to make him do the very thing he had refused to do minutes earlier.
Mistress Natasha did not take it kindly when this loser interrupted her. She was pissed at him and she punished him. She made him undress and she used her sneakers to trample him. She was playing the piano while at the same time stomping on him using her converse sneakers. He was humiliated and in pain but she did not care what he felt. He had brought it on himself.