Princess Serena knew her slave was a clean freak. She had a brilliant idea to use dirt to punish him since he could not stand it. She even slapped herself for not thinking about it earlier. She spat on her boots and let it mix with the dirt on the soles of her boots before she ordered him to lick the soles clean. It was brutal and the slave wished he had been tortured instead. But he had no option but to do as instructed.