Goddess Narcissra caught her slave checking her out, and this was not ok with her. He had been smelling her panties as well, and he was gross. She was not going to allow such a pervert in her house, and so she had to punish him. She did this by cruelly shitting on him, and he had no choice but to eat her poo when he was caught. He had no way to get himself out of the punishment.
Mistress Medea had to resign from her job because her ex boss was unfair on her and he sort of bullied and harassed her a lot. She was not going to let him do that to others so she had to make sure it stopped with her. That is why she had to learn poop femdom and then use it on him. She did so and as he ate her shit, he realized he had to change and he did.