Nina Hiss has found traces of pee on her toilet! She brings in the disrespectful slave and orders him to lick it up.
To teach him a lesson, she places his head down the toilet and has the pee she wanted, all over his head!
This leaves more traces of pee on the toilet, so now he must clean up hers.
Of course, to add to the humiliation she flushes the toilet with his head still inside of it!