Love, love, love this. My only regret was that it wasn't a longer fic, as I just wasn't ready to be done with it yet. Though, it did feel much bigger and richer than the 10,000 words it did have.
I would have loved to see the healing and progression of their romantic relationship, though the kissing was very sweet and satisfying, and so wonderful to see. I adored this exchange that ended with this line the most:
Snape's expression softened immediately into something that was akin to a smile. "Then why don't you?"
Gah!
I love that Severus took Harry in without question, and that Harry was allowed to heal in his own space and time. That, like torino said above, Severus cared but didn't coddle him. It was just the perfect blend of progression, wrapped inside a wholly satisfying and beautiful fic.