Balthier will have to tell David sometime that he has, in fact, heard him purr. Though the context was significantly less pleasant.

David's thinking ahead, even in the full throes of desire, makes him laugh with delight. "Oh dear one, you make my heart light," he says, and then he's disappeared. He's not surprised on the chasing, though. David has had a rough day, and he hasn't eaten, and Balthier is aware he's expending him. That's half the point, really.

He returns shortly with the box, pulling the packaging off the outside; it's pertinent to keep these in his drawer now anyway.