Mistress Anni felt that this guy was clueless and she had to dominate him for it. She felt that he deserved to be dominated and punished which she ensured happened. It was cruel as she used her high heels to do it. It was not just painful, but it was also humiliating for him and he got the message she was sending his way as he did not want a repeat.
Mistress Anni felt that her assistant was not behaving as well as she needed him to and she had to tame him. That is why she opted to dominate him and to teach him a painful as well as cruel lesson. That way, he would never forget it and the two of them would never have any issues after that. She had him lick her dirty sneakers before using them to trample him.