Madame Marissa and her friend took this slave to the woods. They wanted him to carry some things for them and they also wanted him to carry whatever they wanted carried. But he was too lazy and too slow to keep up with them. To make sure he did, they trampled him with their dirty feet. They made him lick the dirt off the shoes and he had no option but to do as told.
Mistress Slava wanted to wear these shoes and found that her slave did not clean them the last time she wore them. She wore them anyway but instead of wearing them like that, she made her slave lick them clean. That was to make him remember to clean them the next time she is done with any pair of her shoes. The poor guy licked the shoes clean from the sole to the top of the shoe.
This mistress is popular in school and this new one wanted to get into her circle. She assessed her and put her through a test first. It involved humiliating her and she did it perfectly. She made the new girl lick the soles of her dirty feet and made her do all the disgusting things she wanted done. All this time, she was busy chatting with her other friends on phone.
Madame Marissa came from her hiking trip with dirty feet and found that her slave had not done the chores she had given him many days back. She was pissed off and used the same boots to trample him and punish him for not doing what he should have done a long time ago. She stomped on his face with her boots and made him scream and cry out like a kid.