Mistress Nyx was misguided by this guy and she was not happy about it. She had to do something about it and this was done through her brutal cbt femdom. The mistress stripped the guy naked and she forced the poor guy to endure the pain of being crushed and dominated on the nuts. He never thought it would get to that but it had and he had to endure it all.
Mistress Nyx did not want any negativity in her life and so she chose to dominate this loser because he was full of it and he wanted to introduce it in her life. She did it in a way he had never experienced and this was by crushing his balls and his dick. He was in pain and the pain sent him the message he needed to pay attention to.
Mistress Nyx does not like bullies and when she learned that this guy was one, she knew it was time for her to do something about it. So she chose to make the guy regret what he had done and also to force him to stop being a bully. As she tied his dick and his balls and pulled the strings, she remembered to crush his balls with her heels as well. The plan worked.