She uses the machine to the point she breaks her own skin. Went out of her way to dress sexy. Think of the effort it took to set this up. She was likely throbbing with anticipation by the time this started. She is often willing to use machines or whatever she needs to handle herself. Like many other vids she would probably like to have a man hurting her like this but she did what was needed to get her pain fix. Likely went on to masturbate after this.