Madame Marissa had asked her slave to do something for her but he forgot. She wanted to make sure that he never forgot anything she told her again. So she made him lick the soles of her shoes, and he did so after she had spat on them. So he was licking both the mud and the spit. It was humiliating for him but it taught him the lesson she wanted him to learn.
When Shayla and Chantal get together, they have a great time. They don't like to stop chatting when they get together so when they see their slave is hungry, they feed him. They place his food at their feet and smash it with their high heels. They allow him to eat at their feet. When he is thirsty, they are happy to spit some of their drinks into his open mouth.