'Sarah1281'. Published in 2008/9. Available online.
Another Harry Potter fanfic. This one is apparently a parody.
First read (September- 2012)Edit
Online version at FanFiction.net. 891059 characters long, or 463 standard pages.
Recommended at r/HPMOR probably, I put it on my Kindle on September 4th 2012.
Forgot about it and came across it again on October 5th when it appeared near the top of the list of most favourited complete Harry Potter fanfics at FF.net posted at r/HPMOR. Realised I'd read the first 5 chapters.