Fatestaynightxreader Histoires

I have an awesome idea but I'm not sure how it will turn out. I haven't finished the series yet so don't judge. Her sister was dying. The sister that had been there for Rose Medina her whole life was dying, and there was nothing she could do. There was only one answer: The Holy Grail.

This story is all about Lancer and Yourself falling in love after a huge love/hate relationship went on last time your father summoned him. Although there's a twist. He is the only one who remembers meeting you.... why?