Mistress Natasha wanted to degrade her new slave and she did it using her muddy boots. The mistress enjoyed how degraded he was at what she did and she laughed at him as he tried to beg for her to stop. She did not stop as she had a reason for doing all that and she had to achieve her goal. The slave learned never to take anything for granted.
Madame Marissa caught her boyfriend cheating and she did not like it. She had to make sure that he learned his lesson the hard way. The mistress had to make sure he would never even think about it let alone do it again. So she used her muddy shoes to trample, stomp as well as crush him. He was in the pain of his life and he regretted what he had done.
Mistress Alice is a vengeful person and this guy did not know that. He was looking out for his interests but he ended up pissing her off and that meant she had to revenge. She did it in a cruel way by using her muddy shoes to torture him. She had him lick the muddy soles and she used the same heels to crush and trample his hands and fingers painfully.
Goddess Vivienne wanted to torture this loser because he did not have any respect for her. He was her slave but he looked down on her and the mistress chose to torture him with her muddy shoes. She made him remove his clothes and when he was done, she went ahead to crush him and not only make him feel pain, but also make him dirty with her muddy boots.
Mistress Natasha was not amused to learn that her slave had been stealing some of her stuff from the house. She had set up a trap and that is what caught him. She went ahead to crush and humiliate him for what he had done. The mistress also forced him to lick her muddy shoes so that he would never do it again. She even made him repay everything he had stolen.