Madame Marissa was wearing her gumboots and she used them to punish her slave. They were dirty as she had used them to walk in mud. She then removed them after he had licked them clean. She wore her boots and she used them to crush his face as well as have him lick the soles. She did it again with different boots and degraded the slave cruelly because she felt he deserved it.
Lady Samantha did not want to go out but she needed to have fun. The only interesting thing she could think of was humiliating her slave and that is what she did. She degraded the slave and forced him to lick her dirty feet even as she trampled and stomped on him for fun. She knew the slave did not deserve any of it so she found a scapegoat to humiliate him.
This mistress went to the gym and when she came back, she had smelly socks. She had a drawer where she kept the smelly socks so that they would not make her room smelly. Her slave was supposed to pick them from there and wash them. He had not done that and she took the dirty socks and made him lick and smell them as punishment before she made him wash them.