Mistress Beh had to punish this guy but she did not want to do it the way she was used to doing it. That is why she chose to use dirty feet femdom to do it. The mistress ensured that her feet were dirty and then she used them to punish the guy. He had to lick the dirt off her feet and he also had to smell them as well.
Mistress Kelly wanted to dominate this slave because he had done things that they did not want and that she had warned him about. That is why she had to use her dirty feet to punish him. She lined up her dirty shoes and sandals and had him lick them clean. He had no choice but to do it as he knew she would do even worse if he did not lick them.