The Doctor could feel the blush creeping up and burning his ears and brushed the imaginary crumbs from his hair.

"Stop it" he mumbled. He ran a hand down the back of his neck, smoothing the hairs that had begun to stand on end when the Master's voice had ghosted over his ear.

"Yeah, sorry. I just donn't see how that particular activity would build trust. especially when it's bound to have an audience."