Stefan drops her hands, curious and concerned, wanting answers he's not sure he deserves or should have. He's not her brother, not someone who should be making another close connection and putting them in danger by proxy. River knows so much about him - too much, and maybe that's what drives him to know more about her. Give and take in equal amounts. But, he also wants to understand her better, to give the girl someone who gets it without question more than he already does, who can hopefully help her more once he's got more pieces to the puzzle that's still incomplete in his head.