Her face on the last panel isn't really flustered, because I assume she knows he's delirious. It's more concerned if I'm being honest, which is the reaction I'd expect because I don't think she would know how to react.
I also laugh how adult Nagatoro is just taller Nagatoro in a business suit. Even in his dreams of the future, she wears the pants in this relationship.
@The_Trash_Man Why would you post a picture of my parents?