I totally adore this! I told you to expect a comment from me :)
I have one negative comment to make, and it's not even negative, I'd call it constructive critism.. or a tip :)
When you're writing quotations, you should really put a period or comma afterwards. “A pleasure…Miss Silver,” he drawled in his deep voice, lined with a sexy edge. See? Comma :)
Anyway, I love it, and I really can't wait to see where you take it. And reading Crazysabby's comment above, I need to say, she's in the sixth year right? But is being sorted where she hasn't been to Hogwarts before? Right?