Wink would be good, Sarahvma...I don't remember when they did that--probably not with Grissom and Sara, right?
When they were working the pig-in-a-blanket-made-me-a-vegetarian-case-but-we-cuddled-under-a-blanket, they had finally found some good evidence since their bug stuff got refuted, and she said it was better than bugs because there was less latin, they both smiled and he gave her a small wink. It was cute. WP knows how to do things that on anyone else would seem cheesy, somehow.
In response to the "how will they play it" thing... I honestly think that after six years of angst and hinting that if they are already together, even if the two of them are playing it completely straight, there will be some roadblocks. For instance, if they are together, that might explain why Sara got as pissed as she did about Sofia visiting him at his office - I mean, as simply a crush (like when she walked in on a much more intimate scene in Season 5) she would be dejected and hurt. She seemed pissed.
And Sara - who has been the Nightshift Queen of shirking the rules - can hardly tell Sofia off too much about her behavior. It was an excuse to get mad at her at all. I'm not blasting Sara, here, I'm just trying to say that all of the actions between the three was pretty much screaming subtext.
And I do want to say that I recognize (because there's been a lot of debate as to how 'wrong' Sofia was to come to Grissom) that what Sofia was doing wasn't just inappropriate but also illegal, however like I said before, subtext made it as heated as it was. If it were Catherine it would have been a simple, "get the hell out" in polite Catherine terms.
But this is a very long way of saying that I doubt the writers are just going to make it a boring, sweet affair after all of this.