Madame Marissa forced her slave to lick her boots. He had to do it because he had not followed the instructions she had given him earlier. He had nodded his head and she thought he had understood her but it seems like he had not. So she made him lick her feet and her boots before she used the same boots to trample him and make him learn his lesson.
Lady Alshari is a mistress who likes to do anything she feels like doing since she is one of the few mistresses brave enough to even attempt humiliating a slave in public. She was waiting for her slave and she had promised herself that if he came later than they had agreed, she would have no option but to punish him there and then in public and humiliate him badly.
Mistress Lauralee wanted to instill discipline in her new slave and she had to make sure he learned what she taught him in the quickest way possible. She used her boots to trample him and forced him to lick the heel and the rest of the shoe. She humiliated him on her balcony and did not care who saw her humiliating him. All this was to show him she meant business.