He never had and likely never would trust anyone, so he wasn't completely convinced by her reassurances that whatever was said would be kept confidential. Still, Bran was here for a reason, and afterward he'd make sure Katya wouldn't say anything - because if she did, it wouldn't end very well. "Good." He'd seen how people reacted to the thought that there might be a Phantom, and if they had his room number he would never have a moment's peace - never mind the fact that everything with Lotte would be ruined.
He began to hold out his right palm but stopped when she mentioned reading his past. Whether she was legit or not, his past was something he didn't want anyone to see... on the other hand, it would make him more inclined to believe what she said. Bran studied her for a moment, frowning, before finally nodding. "I don't need you to read all of my past," he said tersely. "Just a few details will do, and then the story."