Responses
Simple. "commoner girl" talk like that to "Superior guy" when she does not see herself as "commoner" or him as "superior", or simply doesn't care. But in this case I reckon it's the first option since in her time she was no commoner, but closer to some type of "noble". I mean it, seems to make sense, to me, with the time lapses, and her original personality and upbringing.
Oh and for all the rest... I don't mind the intensity and pace of the story so far. But that's my personal preferences. I find it cool that you seem able to identify what you like/dislike.
the conversation and interaction between characters are kind of bland.
None of the 3 mains seem like they have much ambition/interest or passion about anything. Also the interaction between the younger brother and the main girl was kind of absurb - how can a commoner girl talks to a superior person like that?
The beginning got me interested but as the story goes I am finding it a bit monotone.