There is an unauthorized ending to Harry Potter and the Natural 20, currently up on fanfiction.net - It is already complete, and a peach of a read. I love it, and since all of Sir Poley's previous sections of that work have their own threads here, and seeing as how it seems the original is frozen in limbo, I thought this deserved a mention.

https://www.fanfiction.net/s/1327989...the-Natural-20