Mistress Ava does not like dealing with unkempt people. She told the guy when they met but he did not want to adhere to that. So she had no choice but to punish him for it and she used her farts to send a message and ensure that he learned his lesson. He got scared and realized that he had messed up big time so he changed and stopped being unkempt.
This guy was too boring for mistress Ava and she had to do what she does best and she used her fart fetish to dominate and to torture him. In no time, the guy had been forced to lick her ass and to do the same to her farts. He nearly choked as he did it but the mistress did not care about what he felt as long as he did what she asked.