The Occlumency lesson changes everything.
Harry should've died the moment the Killing Curse hit him right at the heart. His body was already decomposing when his soul returned to it alive, so it continued to decay. Rated M for body horror and descriptions of human decomposition.
The first Occlumency lesson rips apart a life-long glamour and reveals who Harry Potter’s parentage really is. It reveals years of lies by a twinkly-eyed Headmaster. Order of the Phoenix AU.