Goddess Grabriella and mistress Scarlet wanted to send a message to their slave that he had to change and that he had to be cleaner. His dirtiness was not going to be tolerate any longer and that is why the mistresses chose to use their boots to do it. He never expected that and he was shocked. But he did as instructed as he knew that the next punishment would be worse.
Goddess Gabriella and mistress Scarlet had beef with this slave and since he did not want to make the changes the mistresses wanted from him, he had to learn his lesson the hard way. That is why the mistresses opted to take him to the woods and use muddy feet to trample and humiliate him. He was also gagged with the same muddy feet before they were done with him.