Lady Scarlet wanted her sister mistress Gaia to know how to punish people with scat fetish because it was very effective in making them change or toe the line. That is why she went out of her way to make the guy eat her poo as her sister watched. And when she was done, she asked her sister to do the same and she did. The guy had to endure degradation from 2 mistresses.
Lady Scarlet wanted this guy's professional help and she sought him out. They had an agreement over everything including how much she was going to pay him. But the guy suddenly started acting weird and he wanted sexual favors from her. She got pissed at his unprofessionalism and she made him eat her shit and drink her urine. The guy learned his lesson and did what she expected of him.