Fate zero x male child reader (discontinued)

Y/N is the child of kiritsugu and irisviel. Born with a special phenomenon where he gains the powers of a hero he works with his parents to fight in the holy grail. In this story he'll go through pain and suffering as he sees what the holy really causes

(This is the first book that will have Y/N, I'm planning to keep on going to unlimited blade as a continuation and then to heaven's feel)