Mistress Anfisa wanted to have her socks sniffed and so she went out of her way to dominate this loser. She did not care what he felt. All that she wanted was to make sure that he did what she asked and what she asked was to have her socks to be licked. He had no choice but to do what she wanted. That is how he knew never to mess with her.
Mistress Jane and queen Hanna love the fine things in life. And so they were pissed to learn that this guy was interested in them because they knew him as broke. They had allowed him to join them but he could not pay for shit. And he had the audacity to hit on them. So the mistresses turned him into a foot slave and he had to lick their dirty soles and smell their stinky shoes.
Goddess Liana had a new slave and she wanted to find out if he knew how to follow instructions and whether he would do all the things that she wanted him to do regardless of whether he felt they were good or bad. The mistress asked him to lick her socks and her feet, both of which were dirty as well as smelly. He did as asked and she knew they would get along just fine.
Mistress Anfisa was not content with her slave just licking her socks or sniffing them. She wanted him to go an extra mile and do something else. This, according to her, was to chew her socks. They were smelly socks and she knew they would be perfect for the job. And they were. The cruel mistress used them to dominate the slave and she had a good time doing it.