[Knowing what he knows about Adrien, it's not hard to fathom a guess who the book belongs to. He doesn't say anything about it, but he does smirk. Be more obvious, catboy. Of course the question distracts him and he rolls his eyes to the ceiling.]

I practically raised her. [There's a slightly bitter smile as he thinks back on it.] She ran away even younger than I did, and even younger than a friend did. When we found her she was only seven. She's a little older than you and Marinette now. ...neither of us had really great families, so I wanted to be better for her because it's what she deserved. Maybe I'm biased, but I think she turned out to be pretty okay.