Martin's already aware when someone steps into his library - largely because he's already in his office, just tidying generally because it's still wild to him that he has an office, and he hears the light footsteps scurry in - but it's only when he hears the gentle cursing that he sticks his head out the door.

Oh- this was the girl that Jon was talking to, the one that argued with Coraline.

"I mean- you're not in trouble," he offers lightly, stepping into the hall. He's a stocky guy, with the soft features of someone who's never had to live in real strife, and his English-tinted voice is warm, if uncertain. "You're welcome to stay and read it here, if you like."