[ He sees MK freeze up. So, after he gives her hand that one reassuring squeeze, he lets go, putting his hands back at his side. The Doctor's not stupid. He can recognize when somebody doesn't like something. And if MK's still a little bit tense with regards to human contact? Then he'll gladly ease off a bit for the moment.

The Doctor can't help but smile though at that statement. Huh, prickly little socially awkward MK not liking people very much. What a shock (said nobody ever) ]

Donna and I liked each other, but it was that sort of friendship that got loud. We argued a lot and got on each other's nerves constantly, but at the end of the day we still remained good mates.

[ He shrugged a little. ] I've had friends like that, though. A couple of my good friends here didn't like me in the slightest when I first arrived.