When Grissom cheats on Sara with Catherine, then proceeds to leave them both for Sofia, and THEN runs back to Sara proclaiming his love for her and THEN convinces her that they should start a threesome with Greg and THEN during all of that Warrick and Nick start their own affair under a lab table in the trace lab, maybe THEN...and I stress the 'maybe', maybe then, this will be a soap opera. But only then.
Definitely agreed. I don't think a muttered term of affection and a little bit of flirting over 5 episodes counts as a soap opera.
If Greg decides he's going to make a run for Sara's heart as well - that, too, would be soap opera, but at the moment? They're playing this very neutral. Less "oooooh secret relationship" and more "two people at work who happen to be dating".