Mistress Mara and mistress Rosella had a bone to pick with mistress Barbara. They had to teach her a lesson and the lesson was cruel and degrading. They had her drink their pee and when she was done with their pee, they made her lick their pee till they came. It was both humiliating and tiring but she did it as she had no other option. She learned her lesson and never messed with them again.