The sharper glance past his shoulder that she gets is probably indicative of Lucius catching concession, focused first on the act of information giving in a small, petty moment of satisfaction, before processing the content itself, which-- oh. He had meant it, when he'd sneered about how easy it seemed to be for her, to lie on automatic. 'Old hat'.

He blinks at this last thing, jaw setting. Gratitude, however much she thinks he should have, is not written into his expression, and he is making sure it doesn't. But he does shut up, which might be better, and he does move to the cupboard, which is just a bonus.

Taking the crystal off the shelf, it's held out for her to take.