Mistress Sabrynna and mistress Bruna wanted these guys to learn that it was not ok to be foulmouthed. They had talked to them and asked them not to be but the guys ignored them. So they came up with another way of passing their message and making sure that they were understood. The mistresses used their boots to do it. They had the guys lick their muddy boots as well as trampled them with the boots.
Mistress Bruna wanted to test this slave and she did it with her muddy shoes. She knew that he had to learn to fear her and so she forced him to lick her muddy shoes. He had to do it until they were clean. The mistress told him that if he messed with her, he would be made to do worse things than the muddy shoes he had been made to lick.