Moving along nicely here and I wonder if that "perp" would've had much success trying to possess Harry? Given all that Harry's been through and the occlumency and mental skills he's acquired getting to where he is now, I rather suspect the "perp" would have a much more difficult, if not impossible, time posessing Harry and it certainly would not have been able to remain hidden. It's going to be interesting watching him suss out what's happening and then prove it sufficiently to save Ron's name and reputation.
Author's response
Thanx, Ron's rep is definitely in need of rescuing. It'll be interesting indeed to see what happens when the perp tries to possess Harry.
N!