A bit odd for a story but the use of your idea of a magic drain works just fine. You had me worried for a while that Harry died but the answer was a nice surprise.
I would agree that almost any story is better than the disaster of the real(very stupid and a total waste of the paper it was printed on) seventh book.
At least your had the characters grow up and mature instead of using "luck".
Over all a good job
Author's response
I'd never found a story with a depowered Harry, so I figured, why not?
DH was a disappointment.
Growing up and maturing WAS sort of lucky wasn't it?
Thanks for the review.