So I've been on a mad quest to find me some DH fanfic, and lo, I've actually found a gem already. Superb take on Severus and his motivations in the story:
Doe-Eyed by
snark_baitWell written, deft handling of one of the niggling plot holes JKR hand-waved off, and really good characterization of my favorite Potion's Master. Definitely do give it a read.
And I don't know if I mentioned
On the Shores of Darkness when I discovered it last week, if not allow me to do so now. Nice post-war Snupin that progresses logically and realistically. No spoilers for DH, so feel free to read this one even if you haven't finished Book 7.