Princess Nikki and her friend mistress Tina discussed a way to humiliate a slave which was degrading but not painful. After long discussions and going back and forth, they settled on one. They decided to make the slave drink a mixture of pee and spit so they bid their time and waited for him to mess up since they do not like to humiliate a slave for nothing. When he messed up, they had fun seeing him drink their pee and swallow their spits.