Mistress Rissa did not like how her step brother had spanked her ass sexually. She was shocked but she thought she had overreacted. He did it again and she knew it was not an accident. And that was when she showed him the other side of her he had never seen before. She trampled him and ball crushed him to send a message that he should never try any such stuff on her.
Mistress Rissa had to punish this loser as he was now a bother to her. He was trying to seduce her but he was awkward at it and it pissed her off. So she came up with a way to deal with him and that was by making him smell her feet. She had made them smelly for that purpose so that they could be a form of punishment for him.