Harry Potter: too young to die

Harry Potter knew quite a deal about fairness and unfairness, or so he had thought after living locked up all his life in the Potter household, ignored by his parents to the benefit of his brother - the boy who lived. But unfairness took a whole different dimension when his sister Natasha Potter died. That simply wouldn't do. FYI the original story is on fanfic by thebombhasbeenplanted and I have permission to post it on here Almost 200k words