"Well I've been here a few months and you've been alright," the Doctor pointed out reasonably. He was confident Amy would pick up on what that meant in her own time and didn't offer much else by way of an explanation.

Her question does make him falter a little, the smile waning as his hand comes up to rub at his jaw and tap against his lips lightly. "Oh, you know me. I've got a... thing. That I'm working on."