Tim's hand on Tony and Tony's looks at it is even better when you realise (well, it's the impression I have) that McGee is not really touchy-feely. He accepts hugs from Abby and Tony, even like them, but he hardly gave them. With Abby, I can remember one almost hug only he instigated, in the interrogation room when they caught Lee. With Tony, I can't find one touch instigated, except when fighting. Of course, I could be wrong. Memory and thoughts are a little slow right now.

My point being the touch is interesting because it's a little more than what he usually do, and if Tony is as observant as he said, he could have the same thoughts as me, and noted as significant.

And so one step up in the relationship. That explain why he just invited him to his uncle's manor. Or why Tim started to quote movies.

And how everybody doesn't know?!? Or maybe like Gibbs, they know, but pretend they don't.