He Who Must Not Be Normal (H/D, NC-17) by anon
I'm not going to gush. I'm sure everyone else is reccing it all over, and I pretty much spewed at the still-anonymous author, but I will say this: 40k never flew by so fast. Also, it's a thoughtful, authentic piece of writing from an author who clearly gives a strong shit about character development. And Harry's a little creepy. Read if you have time to do anything! :)
Okay, now I'll get back to failing at fandom.