[9S would be the most animated exposition fairy if given the opportunity. Being issued an inquiry like this, he's only too ready to answer, pleasantly surprised that Naoto is interested.

The reactions humans have had to him are pretty mixed at this point... He wonders if the same is true for 2B]

Well, we keep pretty busy too, with the war and all. Even those who don't fight handle things like maintenance or gathering information. When our work is taken care of, there're leisure activities we enjoy too.

[Sure they don't have restaurants, or vacations, but...]

Like 2B and I go fishing sometimes.