This guy needed to be dissuaded and the mistress did it with her farts. The mistress had to make sure that the guy would be made to smell farts and to do some other cruel and humiliating things. He thought that she was bluffing but she was not so she went ahead to make him lick and smell her farts before she was done with him. He knew she was serious and was dissuaded from doing what he had planned to do.