Princess Serena wanted to demonstrate how her slave's mouth smelled. She made sure her socks were smelly and once she was satisfied that they were stinking, she made her slave lick and smell her socks. He could not believe how smelly they were yet she was an extremely clean mistress. He was even more surprised when she told him that was how his mouth smelled. She told him to improve his hygiene if he did not want problems with her.