This mistress wanted someone to dominate and the nearest person to her at that time was this plumber. So she invited him to her house and told him she needed him to fix something for her real quick. But there was nothing she needed fixed other than her addiction to humiliation. So she turned him into her foot slave and humiliated him for fun and acted as if she was out of her mind.
This mistress wanted to use her hairy pussy and her hairy ass to dominate. That is why she had this guy not only looked at them, but also smell them and lick them. As he tried to do that, she farted on him and he had to smell the farts as well. It was not optional for him and he knew it so he did not ask the mistress any questions.