The Arya/Jon relationship is brother sister only. It's a Ned/Lyanna parallel. It had to be special because it had to get Jon to break his vows, as Ned betrayed his honour for Lyanna (safety of her child). And, the relationship makes it harder for them both to do the right ring, giving it the emotional impact. Jon won't want to deny the sister he loves her happiness, her love, but kings have to do this sort of shit, he has to put the realm ahead of her. He failed to do this in ADWD, and for it he