This boots was talking too much and yet mistress Natasha wanted peace and quiet. She tried to tell him as much but he did not take her seriously and went on talking. So she used her boots to shut him up. The mistress forced him to lick her boots until they were clean and she trampled him a little bit when he was done licking them. That shut him up.
Mistress Natasha was not pleased with the way her slave acted and she had to make sure he learned his lesson and that whatever he had done would not be repeated. She used her dirty boots to humiliate him and to send the message she wanted to convey. The mistress made him lick the soles of her boots which were dirty. She had stepped on mud and other dirty things before she asked him to lick the soles.