OMG, I didn't realize I hadn't responded to my comments--my apologies! I am so glad you liked the characterization, and particularly glad you liked my Tobias.
I agree that Severus had the opportunity to create the father he wished he'd had and took it. I found that I began to think that his life had taken a totally unforeseen turn, and he rolled with it beautifully (well, Severus would, wouldn't he?), but it was only when Harry came into his life that he allowed himself to connect with someone on a really human level.
You are most welcome, and glad you enjoyed the story.