This guy was a loser and he had to get what was due to him. Mistress Nyx did not want to let him continue down the path he was on and so she had to use her boot fetishism to dominate him and put him in his place. That is exactly what she did to him and he was shocked at what she did. But she saw it through and made him cry in the process.
This guy needed to shut up and mistress Nyx knew that the best way to make him shut up was to use her boots. So she did not hesitate to use them on him. He cried and he was being trampled and being forced to lick boots but the mistress took a stick and she used it on him when he did not do what she instructed him to do.
Mistress Nyx had an issue with how crooked this guy was. He was her neighbor so she had a front row seat to all of his crookedness. She did not like that very much and she knew that to punish him, she had to use her boots to trample him. She ball crushed him and had him lick her soles. When she detected fear in him, she knew she had gotten through to him.
Mistress Nyx wanted to try boot fetishism on this slave because it was one of those things she had not gotten to try yet and she did not want to waste any time on it. So she went out of her way to dominate as well as humiliate this guy for it. He deserved it because he had pissed her off and she also wanted to try it on him so it was a win-win for her.