I'm not at all put off by the now almost-certainly-confirmed fact that Jon is Dany's nephew, nor do I subscribe to the idea that there is one and only one true-love-of-a-lifetime for every person, but it just seems so obvious that the two powerful and attractive wanna-be saviors of humanity are "destined" to fall in love.
To me it's just too neat and somewhat disappointing that "Ice" and "Fire" fall in love and save the world, blah, blah, blah. But I suppose all the heavy hand holding this last episode signifies their definite mutual attraction for one another and it's a forgone conclusion at this point.
I should hope that if/when they learn that they are also related it's what breaks up any romance, not because it's a problem for Dany, but because it would be a problem for Jon who was raised in the North and wouldn't knowingly practice incest. I would rather it end unhappily or bitterly and the two restore the seven kingdoms as respected allies than star-crossed lovers.
Now Tormund and Brienne I am TOTALLY into - I hope those two get it together before the end of the series! The fact that he's SO into her and she's pretty much mystified by his obvious affections at this point is hilarious! Once she gets over her silly infatuation with Jaime Lannister, I would think that after feeling like an ugly duckling her entire life, she would appreciate a man who thinks of her as his large sword-swinging swan! At this point I just think she's not sure how to react to his attentions since she's so unused to having someone sincerely attracted to her. I mean, he's not at all bad looking; maybe as a Wildling, a little rough around the edges. But then, being a lady of Westeros, so is she.