Mistress Andreea was not happy with her slave and she had to dominate and torture the slave to the max. She did this with her boot fetish and by the time she was done with him, she had gotten him to lick them and do it while naked. She also had him scared and he was so scared that he was willing to do anything that she asked him to do.
Mistress Andreea and her friend mistress Samariel needed to make sure that things worked out in their favor. That is why they used boot fetish to torture these guys. The mistresses had the boots licked clean and by the time the guys were done, the mistresses had had a lot of fun and had taught the guys a lesson that they were sure would not be forgotten in a hurry.