This mistress does not like anyone messing with her or wasting her time. This guy did so and he had to be punished for what he had done. That is why the mistress went out of her way to use her sneakers to punish him. He was cruelly trampled and he was made to lick not just her sneakers, but her bare feet as well before she warned him of ball crushing him if he did it again.
This mistress was a gym instructor and she had a guy at her gym who wanted to gain fitness but was not ready to put in the work. So she found a way to dominate him and make him realize he had to change. The mistress used her bare feet and her sneakers to kick and trample him. He was scared of her and he did all that she asked him regardless of how hard it was.