If you haven't read
Killing Time yet, then what are you waiting for? It's brilliant - both funny and touching, with sharp observations on the canon characterizations of Hermione Granger, Severus Snape, and the other disparate characters the author has placed together at Number 12 Grimmauld Place. The war has taken its toll on all of them, and their coming together under one roof makes perfect sense in the context of the story, as does the changes that subtly begin to take place due to their interactions.
I've enjoyed many hg/ss stories throughout my time in fandom, but
Killing Time has already taken its place on my "All Time Favorites" list, and I can't thank my (for now) mystery author/artist enough. So go and read! Enjoy yourself, and don't forget to review!