he pretty much did reveal that he is reincarnated too but not asking what risotto was and by accepting being her onii-chan instead of being an onii-can
the way he accepted (at least in the translation, i cant comment on the raws) should suggest that he understood the meaning of the word and that it was not just a title ... then again she could have understood that as "he is my onii-chan/guide/master/protector"
the way he accepted (at least in the translation, i cant comment on the raws) should suggest that he understood the meaning of the word and that it was not just a title ... then again she could have understood that as "he is my onii-chan/guide/master/protector"