Princess Serena did not like how her slave's mouth stunk. She had told him to do something about it, but because he was not affected by it, he did not seem to care. So she illustrated it for him by making him lick and smell her stinky socks as well as to smell her sweaty and smelly sneakers. She told him that was how his mouth stunk and if he did not do anything about it, he would only have himself to blame.