No, first you grant the wish, then destroy it, THEN make a new wish.
I'll do yours, then.
You read Harry Potter, feeling the totally awesome sensation that you feel when you read it, but then you accidently get hit by a bus, forgetting all of it.
Swine flu is then found to have originated from Harry Potter books, and all of them get...disposed of.
You never get to read them, again.
I wish...I could brush my teeth right now.