BREAK THEM UP! KEEP THEM TOGETHER!
So, no third party love interests coming between our main characters. That leaves only a couple of narrative devices to use to keep things interesting. One would be to throw in problems every few episodes that keeps the lovers from becoming boring, while giving us new and hotter makeup moments between them. Or... to break them up for a while, either due to their inability to perform their job while together or due to personal issues within the relationship. Now, you COULD keep them together and leave them happy to explore their love but this is a TV show and that is not going to happen.
It is not going to happen.
Stop even dreaming about it.
I know, I know... you are writing your hate comment to me right now! "MAGNUS! WHY DO YOU BE SO NEGOTEEV ABOOT THE SHOW, EH?!" Well, eff you and your French Canadian accent.
You don't like what you are hearing? Then tell me what you would like to see happen. Here are some potential scenarios for them:
CHOOSE YOUR OWN ADVENTURE
a. Chuck and Sarah are happy and the world is perfect and the birds are singing and we get a MUSICAL EPISODE! YAY!!!!
b. Chuck and Sarah are happy and the world is perfect and the birds are singing and BLAM! Sarah dies.
c. Chuck and Sarah are happy and the world is perfect and then Sarah falls forward into a ditch and busts her face and is no longer pretty and we learn that Chuck is pretty damn shallow for a nice guy. Hey, why not? Remember his breakup with Hannah? What a jerk! IN FRONT OF HER PARENTS?! REALLY?!
d. Chuck and Sarah are happy. Period. NBC cancels the show during the first commercial break of episode 1 due to general forgetfulness.
e. Chuck and Sarah burn to the ground (you are welcome Jessica).
f. Chuck and Sarah learn that though they are in love, they have problems just like any couple. Sometimes these problems cause them to argue and get mad and sometimes Chuck has to sleep on the couch. But they somehow always figure it out because love conquers all.
g. While reading option "f" you vom'd a little bit in your mouth.
h. While reading option "f" you felt weak in the knees and peed into your diaper like a good little girl! Yeah!
OR FILL IN YOUR OWN OPTION IN THE COMMENTS SECTION.