I was gonna say that Toda should imagine his kids having dead facial muscles like him, but Nanako's expressiveness might be able to even things out. That's how genes work, right?
Its really hard to believe that she imagined these images. ??
I mean Toda is smiling on 2nd pannel? I can believe it, if he imagining all kind of fireworks with deadpan face, but smiling?! Pssssshhh Nakano you surely jest.