"No, I don't -" Ugh. He struggled for a minute to find some way to say that obviously he wasn't upset, it was just that when his little sister felt like she had to retreat to someone else's bedroom, maybe he would want to know why, and was that too much to understand? He shrugged darkly, giving up after a moment. It would only sound stupid, or fretful. "'S not a problem," he said, looking down at the carpet. "Just - you know. Been worried." It was a little harder to sound gruff than he would have liked.