Besides facesitting on this unreliable slave, this mistress also made sure that he licked her ass and her pussy and before she was done with him, the mistress farted on him. He was scared shitless but he knew that disobeying her would be even worse for him so he did what she wanted him to do so that she would let him go. When she got bored of it, she let him go.
This mistress wanted to try some naughty and kinky things but she did not have a slave to do it to so she chose to pay someone to do those things with her. This guy was broke and he needed the money so he agreed to do it and the mistress loved the experience that she had with the guy doing what she wanted and what she had been craving for.
This mistress was sweaty when she got home and she wanted the sweat licked off her body before she went to take a shower. So she made sure that her slave did that and it was not a request but an order. He had no choice but to do what she wanted him to do and that is how licked her body and did all the things she asked him.