There was some nice Jim/Cath interaction in this Still Life . There's a scene where Jim is talking to Catherine and Greg. When he talks to Catherine, his voice gets very soft but when he talks to Greg, he's all business again. I want to rewatch the eppy to see how they look at each other when they're sitting with Grissom at the end. They just seem so comfortable around each other.
And put me on the side of they are so doing it. I agree with you Brassfan24, they've had a thing going on since Bite Me .