[sansa laughs a little. she doesn't exactly know how to explain teasing someone out of love, though she found herself doing it to arya almost immediately through the portal.]

Oh, I think it's meant to make you laugh--that's only how it makes you feel. My family was only ever good, except for my aunt, who was mad. [well, and sweetrobin, but he was only ever stupid and unpleasant.] Arya could play quite cruel japes sometimes, but she was little then, and when I saw her in the portal, she only teased me out of love. I have known people to be badly hurt by their siblings, though. And more of them by their parents.

[she thinks of adaine before lord tyrion, here. and she wants to ask lazarus about his world, but she did promise she'd tell him about hers.]

My family ruled the North for thousands of years by being like Torrhen. Our words are 'Winter is Coming." It's meant to remind us to prepare for any trouble. Our duty has always been to see the North through the winter, ever since the days of Bran the Builder. He was the first King in the North, and he built the massive wall of ice at our northern border to keep out the White Walkers--horrible monsters made of ice who commanded armies of the dead and hated all that lived. My ancestors beat them back to the Land of Always Winter in the Battle for the Dawn. My brother Jon Snow leads the Night's Watch, that guards the Wall against them.

[her tone is light and a little wry. she smiles.]

You can understand why I wouldn't want the necromancy teacher to know who I am.