Except for Ginny, Hermione didn’t really have many girlfriends. Luna was there but they weren’t incredibly close. Nevertheless, conversations about books weren’t happening between Hermione and the both of them. It just wasn’t a mutual interest. And as much as Hermione understood that, she still wished for these conversations to happen with someone. Harry and Ron only read when they had to and even that wasn’t always a guarantee. And then having them talk about it was not going to happen in this lifetime.