For an episode without Colby in it, that was the slashiest David/Colby episode ever. Wow.
It's the one where they're trying to solve a murder before someone's executed and win a basketball game at the same time. The fun/serious jars a little here and there (and Larry totally cheated at the end) but it's still a very powerful episode. It also has Tony Longo in it, the man who did the Sky Boy! shorts with Garett Maggart.
Anyway, back to the David/Colby....
Colby is off on a fishing trip so David is teamed up with Nikki. He tries, rather wistfully, to get her to play a game he plays with Colby (get your minds out of the gutter; you have a bullet in your gun and a time machine; who do you go back and kill for the betterment of humanity) and she won't enter into the spirit of it so he says he wishes Colby wasn't on a fishing trip.
Later, David says something joking about being with her so that's his alibi when tire tracks at a crime scene match his car and she again just stares at him so he says Colby wouldn't have responded like that and she snaps back,
"You talk about him a lot. Don't you have a girl you should be talking about instead?"
Uh...
Then later yet, she catches him furtively, sneakily leaving Colby a voice mail to 'update him on the case' (sh'yeah, right, like he needs to know when he's on holiday?) and says 'Did you just call him 'baby'?'
David says, truthfully, that it was 'buddy' (still a pet name the way you said it, David, sweetie) and she said something I couldn't catch about maybe he should be calling 'JDate'? I googled that and it's a Jewish dating service. David's Jewish, too? Or she's a David/Charlie slasher? Who knows.
I pet this episode.