Ah, they're in a fairly positive situation. The pairing has received the most development throughout the series, and that's In the past thirty chapters or so, Eri overcame one of the key problems that could have destroyed Flag. Namely, learning the truth about Harima's feelings.
When Eri discovered this, Kobayashi could have turned her into a psycho-violent villain but that didn't happen. After Eri seemed to choose friends over Harima, she could have just lost interest in Harima (like she appeared to in Chapter 217) but that didn't happen.
Then, there's Harima and his infatuation with Tenma, but that's hardly new. Besides, fictional relationships need some kind of obstacle.
The two are friends right now, yet that wouldn't take much to change. Being friends gives Kobayashi a good opportunity to allow them to interact and develop the relationship, so it could be just what's needed for the pairing to progress.
Not really. It's not very hard for writers to turn relationships like this into romantic ones.
Originally Posted by Itchabod
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you. - Friedrich Nietzsche