Lady Naomi does not like unreliable people. When she noticed that this guy was, she had to punish him and she did it in a way he did not expect. The mistress had fun torturing the guy and she farted on him to choke him a little before she let him go. She told him that she could do worse things to him but only if he did not stop being unreliable.
Lady Naomi and her friends were interested in facesitting and since none of them had tried it before, they had to watch videos of it and then try it on their own. So they got a slave and they tried what they had learned on him. And it was a lot of fun for them but it was not as much fun for the slave as he had to endure all the pain and choking.