The problem is that, before they got into a relationship, they'd been working partners for 5 years and know about all of each other's quirks and things in their past that made them who they are. They've been in life and death situations and have complete trust in the other person. So everything we've been able to come up with, has been shot down by "oh, they handled that in ep X" or "That's OOC."

And it wouldn't matter so much if we didn't have this one scene, later on, that needs more emotional impact. And the build up won't be there, if there isn't any upheaval.