she already has feelings for takase. But ships them beacuse she wants to see him be happy and she fell in love with the takase that loves mikoto. She could still be a concubine and avoid the need to wait a generation tho.
She speaks Japanese, the word she uses is 恋愛, she is speaking about Japanese words. SHE SPECIFICALLY mentions that the authors of the time were influenced by the west, the problem is that what she says is lost in translation.
yukizuriman has used them in episode one, but no monster since then has been strong enough to require him to suit up. we may get to see him in his suit in the final arc
They werent assaulting her, they were asking for her advice, and he only though that they were confessing to her, not trying to assault her, there were girls also in the line, so your logic kind of does not apply in this situation.