He doesn't quite have the nerve to nip it directly from her hand. Oh, make no mistake, he would if there were less of an audience, but with people watching - guards watching - it's not worth it for either of them. Pity. Still, even as he takes the sugar from her fingers, he takes the opportunity to press her wrist with his other hand. A gentle caress, a sort of remember this.

"I'm grateful," he murmurs, and then reaches up to just touch the sugar to his lips. A clear indication that he's going to savor it over the long run. Then he meets her eyes and says, "And I think you've earned your secret. You have to swear that you'll keep it for me. From everyone."