Madame Ellen was so pissed with this guy that she had to make sure that he was degraded in a way he had never experienced before in his life. That is why she came with a used condom and she forced him to drink it. He tried to beg her to stop it and give her a different punishment but she refused and insisted that he had to do it.
Madame Ellen wanted this guy to learn to do things the right way. The mistress had to teach him to do things the right way. One of the things he needed to learn was how to be prepared for what he needed to do. So she used her crush fetish to do it. She crushed his ass and she had him lick her soles before she was done with him. The pain and humiliation was enough for him.