Mistress Saida wanted to make sure that this guy realized that she was not going to let him get away with lying to her. She had felt that if she let it slide, he would do it again and she did not want that. So she did what she does best and she used her femdom fetish to dominate and to torture him. That is how and that is why she degraded him painfully.
Mistress Saida knew that her friend's boyfriend had cheated on him but she did not know how to console her friend. She just hugged her and stayed with her. Then her friend asked her how to punish him and she told him to dominate him and she showed her how. They turned the guy into a foot slave as he had to lick their dirty soles and endure being trampled from head to tie using boots.