... Where did all the "we need to hide our nature from society" stuff they've been saying go to? Just because Yuki accepts them doesn't mean that random John Doe from the street will.
The inconsistency of using Japanese honorific is baffled me. There's no way that Haruto guy would call Tamazusa just Tamazusa and Renge with just Renge. Why would you not use it? The -san and -chan?