Sansa and Jon don’t know each other, like her other siblings know him.  And Jon still thinks that Sansa is just like how they were when they were kids.  Stuck up, and dreaming of her blonde haired prince.  Instead she got stuck with a dark haired killer.  While Sansa believes that Jon will be like every other one in his family.  Having a wife and many mistresses, which Sansa dreamed of marrying out of love. (I do not own the Characters, I am merely a Fan)