An oldie, and a new long-fic
I've been faithfully reading your recs, and I'm usually pretty familiar with your seasoned killers, but I was recalling a few favorites from my HarryLu days and wondered if you'd ever read Distorted Lullabies by Lux? http://snowroses.spookyshaunt.net/apollo/distortedlullabies.htm
As for something new, over at AFF, there is a very dark Harry/Cho being serialized that might be worth a look. I'm drooling over it. The title is Paying For His Pedestal by twocanz. The author has posted half of the 34 chapters she's written for the story.