He hasn't lost his smile, but at her comment, his smile renews, changes, touched at the corners with something a little more mischievous. It's one thing to be kissed back. It's another to have it hinted that there should be a second smile. This is a thing that he can appreciate, as he appreciates the crook of her mouth, that little smile.

"An agreement is an agreement, yes? And if we agree, to end our agreements with this seal, that is an agreement. You must say the words, so," and he pauses, for effect, leans in just that little bit closer but does not finish that movement yet, leaves a hairsbreadth of space between their mouths, "do you agree, Sabriel?"