Spoilers?
really. throughout the game it seems like there's an unsaid romantic tension between them, and as the game goes further on it looks like they care about eachother more than they're letting on. Twice they have the cliche "I'M NOT LEAVING WITHOUT YOU!!!" moment, and the picture at the ending credits suggests they could now be a couple.
So what's the deal. Can an adult man and woman travel together and never get busy? Do you believe in interracial relationships?
I think it's possible that the player is never let on that Fran is carrying Balthier's child, and maybe even further possible that this hume/veira (vume? heira?) is St. Ajora.... alright, that's probably a stretch, but discuss.