Lady Scarlet wanted this slave to know that she was not the kind of mistress to be played with as he had been doing. He thought she was powerless to do anything to him but she proved him wrong when she turned him into a pee slave and she made him drink her urine through a funnel. That way, she did not waste any pee and he had to drink it all.
Lady Scarlet was fed up with dating someone who was slow and she used her pee fetish to show him how much she wanted him to improve his mind by reading more and trying to gain new knowledge. The mistress made him lie on the floor and she tied him up before she peed on his face and also into his mouth. She warned him of shitting on hm if he did not change.