[The surprise lasts another moment before he smiles.]
...Yes. I would very much like that.
[She's dedicated, hard-working, competent at what she does, pleasant to be around... Sebastian likes her. That would be someone to consider a friend, he supposes, now that she mentions it. But to think that someone wants to be his friend...]
Shall we go, then? [One could almost think he's embarrassed, cutting ~the moment~ short like that-- but really, it's just his pragmatism at work again.]