Lady Suzan was pissed to learn that this guy was making fun of her feet. He had been subtle about it at first and she did not notice. But when she realized what he was doing, she was angry and she used the same feet he had been making fun of to dominate and to humiliate him. The mistress made him regret what he did and he asked for mercy but she ignored him.
Dorothy's feet started smelling and she was pissed off. Instead of going to the drug store to buy medicine to treat it, she decided to make her slave lick it clean every single day till her feet stopped smelling. She did not care how long it took. That is what she wanted done. She does not like meds and she wanted to use alternative methods to solve the problem she had.