[He hitches his hands on his hips, affecting casualness as she responds, happy to do so since she doesn't respond with fear or wariness.]

Might explain it, yes.

[What a strange little thing to find amid this place. Looking at it is like looking at an old, faded memory — did he own one of those, a long, long time ago, or was his room only ever adorned with a full-size piano back when things were simpler? Sometimes, even though halcyon days feel fuzzy in his mind.]

Though... [He reaches out, waggles a hand.] It also might have something to do with the notes you're playing. Would you like some help with that? I've been known to tickle the ivories now and again.