Mistress Natasha wanted a slave who had good licking skills. So she tested him using her boots. She had them muddy and she asked him to lick them the way they were. He was shocked at the request but he knew it was not a request but rather an order which he had to fulfill. He licked them until they shone and that is when she let him go and pondered whether to let him lick her pussy because he was good at it.