Truly, it's a bit of a challenge to keep up the appropriate cool restraint, when she smiles so, although he does keep his reaction mostly to a certain warmth in his bright, amber eyes, smiling in return.

"...whatever titles I may hold are surely of no great importance, here, Lady Sansa... certainly not enough to warrant that I should address you with such unearned familiarity, I should think."

Of course, it's not hard to tell he's flattered by the suggestion, particularly as he really makes no secret of it. Still, he's quite determined not to show her any manner of disrespect, whatever the temptation.