I like the idea of a borderline asocial former Hakurei Maiden who is bad at changing expression. That could be considered as another approach of the "hakurei maiden needs to be neutral" thingy, since Reimu treats everyone equally, that would make sense that she adopted that approach after watching her mother doing the same.
I'm sorry but I thought I had felt something weird. It didn't look that painful....tatteredI though I had died there...Even thought I'm bad at changing my facial expressions...Would you mind not standing behind me?So are you apologizing or are you making fun of me?Are you honestly apologizing?Eh?In this situation, I should apologize with a sincere expression!!! Move! My facial muscles!!!I'm sowwy for what I did.Um, I'm ReAlLy SoRrY.What kind of assassin are you?Um, I feel like I'm the one who should be apologizing here.Trying to make a courteous expression.What should I do? He looks very angry?bleegghh