Mistresses Evelyn and Hannah wanted this loser to learn how to be hardworking. They felt that the slave was lazy and they could not afford to keep a lazy slave in their house. The mistresses, therefore, chose to punish him for it. They used their muddy shoes to do it and they made sure he was degraded like never before. He begged for mercy but his pleas fell on deaf ears.
Mistress Natasha was angered by her boyfriend. He had called her another girl's name and she hated it. It made her feel like she was thinking about another woman when with her and that he might be cheating on her. So she punished him using her muddy shoes. She made him lick her soles and she did other crazy things to him to warn him never to cheat on her.
Goddess Nika was new to domination and torture. She was not comfortable doing the crazy things she had seen other mistresses do. So she sought to start in a small way. And this she did by using her boots to stomp on this loser. She made sure the boots were dirty before she asked him to lick them and then used them to trample and make him dirty. It was a good start for her and she planned to build on it.