Son Takahani
Kein Taeru
"Huh!? N-no, no, no, no..Nothing like that. It's my little sister." Kein replied in a panic startled by her assumption. He was genuinely surprised, not just by her question, but also by his own reaction. The old him probably would have grabbed her by the collar of her outfit and made some sort of threat while saying it was none of her business.