Mistress Anni did not want to let this guy get away with the nonsense he had done. He had money and she wanted that money for herself. That is why she chose use her hot feet and her sexy thighs to make the guy lick her feet and fear her so that she could make him give her his money. He did it out of fear as he thought she would not let him go.
Mistress Anni is blessed with sexy feet and that is why she had to use them to do some naughty things. She wanted to use her feet to turn on guys and control them. At the heart of it was that she wanted to manipulate them to do her favors as well as to fund her lifestyle. That is what happened and she had a great time at the expense of the guy she was teasing.
This guy had a crush on mistress Anni and he thought she would have the same on him or at least he would be able to seduce her and get her to like him. It did not happen that way as the mistress noticed what he was up to and she made him her foot licker. She controlled him given what he felt towards her and it was easy for her to do it.