This mistress had a new slave and she was concerned that he was looking dumb. She tried him out and she realized that he was indeed dumb. She did not like that and she had to punish him for it. The mistress laughed at him as she degraded as well as humiliated him for fun. She was also encouraging him to educate himself so as to avoid being degraded and humiliated.
Mistress Melissa wanted to show this guy how useless he was and so she took selfies as she humiliated him. He was licking her sneakers and he was scared of her. That is why he obeyed all her instructions and commands. He knew she would do something even crazier than making him lick the soles of her sneakers. That is how he ensured it did not get worse than that.
This mistress went out for a date with this guy but he did not meet her expectations as he was a jerk and was rude to many people and he ended up embarrassing her. When he dropped her back, she took that chance to punish him as she felt that she was doing the world a favor by punishing him and teaching him a lesson no one seemed to have taught him.