Death's Recompense

Ron and Hermione die at the Battle of Hogwarts, and it leads to a future covered in darkness. Death is unhappy with this future and tasks them with fixing it. Their plans start of with befriending Harry Potter to prepare him better for the rise of the Dark Lord. However, the Harry they find is far different from the one they expected. Unbeknownst to them, he's from the future too.