It was having the desired effect, he could tell. As much as the Master was trying to keep his eyes focussed on the Doctor's face, his gaze kept dropping to the fingers tapping casually on the floor, the slightly-out beat that the Doctor was fairly certain was felt through the floorboards as much as it was heard. He half imagined he could have said anything at this point and the Master wouldn't have been listening to him as much as the drumming of his fingers.

Tap tap tap tap. Tap tap tap--

The Doctor obligingly stopped mid-beat, folding his hands in his lap and smiling pleasantly. "You only had to ask.

"Anyway, I wanted to have a chat, so it was good of you to come by when I called."