"I know where we could go," Arya said. She still had one brother left. Jon will want me, even if no one else does. He'll call me "little sister" and muss my hair. It was a long way, though, and she didn't think she could get there by herself. She hadn't even been able to reach Riverrun. "We could go to the Wall." -- Arya XII, A Storm of Swords

He thought of Arya, her hair as tangled as a bird's nest. I made him a warm cloak from the skins of the six whores who came with him to Winterfell … I want my bride back … I want my bride back … I want my bride back … "I think we had best change the plan," Jon Snow said. -- Jon XIII, A Dance With Dragons

When Winterfell burns, Catelyn Stark will be forced to flee north with her son Bran and her daughter Arya. Wounded by Lannister riders, they will seek refuge at the Wall, but the men of the Night's Watch give up their families when they take the black, and Jon and Benjen will not be able to help, to Jon's anguish. It will lead to a bitter estrangement between Jon and Bran. Arya will be more forgiving ... until she realizes, with terror, that she has fallen in love with Jon, who is not only her half-brother but a man of the Night's Watch, sworn to celibacy. Their passion will continue to torment Jon and Arya throughout the trilogy, until the secret of Jon's true parentage is finally revealed in the last book. -- George R. R. Martin, ASOIAF’s Original Outline