"Mm, probably. You and your books." came his friendly teasing in return, his smile pulling to more of a grin. It was good, really, that they weren't perfectly identical. Atreus could only imagine the sort of trouble they would constantly be in if that were the case. Granted, if they hadn't learned how to reign each other in over the years they likely would have seen more trouble than they already had.
As Atreus let himself become engaged in the conversation, for once choosing to trust that the handful of guards between them would keep alert to their surroundings, he rested an elbow on the table and propped his chin in his hand. "I suppose it's unbelievable to me because it surprises me that the others were able to be unseen for so long. One would think they would slim the numbers down, not... simply exist among them?" His tone was slightly unsure, as if he wasn't certain that was the question he wanted to pose. It was all his sister's fault; she had a way of making him think and dig deeper. Atreus might think on a subject in-depth, but he often would do it once and then base all subsequent judgments on that one introspective moment. When, for example, humans did little to counter the opinions he had of them, he felt there was little reason to revisit some topics and think on them again. "I don't see the point in a group making their presence known, and then doing nothing about it. I personally find it very hard to believe the more nocturnal creatures are content with the way things are. Don't you?" He was genuinely interested in his sister's opinion, although he knew she had barely been in the human world long enough to make much of a judgment. Still, Atreus valued her opinion. It wasn't as if he had such conversations with his guards.