History
Faye Livingstone was a British socialite who was attracted to Mr. Sinister. He in turn professed to only be interested in her due to desiring to run experiments on her as a mutant, which she willingly took part in. However, without explanation, he changed his mind and quit.
At the end of her long life, Faye was kidnapped by Tyler Dayspring who wished to force Jean Grey to torture Mr. Sinister into reliving his past with Faye. She was rescued by Beast before this could happen. Faye’s dying wish however was to dance with Mr. Sinister one last time, which Jean helped her to do telepathically. She then died and Mr. Sinister surrendered her body to the X-Men.