Mary Anne Khan dies in a toilet paper related accident and wakes up inside HP's body after the confrontation with Quirrelmort in Year 1. See how this foul mouthed 19 year old uses the body of the BWL (well, clearly didn't live that much if she's possessing him) to fuck shit up royally for Dumbledore and many more. Low-key DM/HP(OC) pairing, def. lots of cursing.