You didn't wanna become a demon but you had no choice it was either you became a demon or your younger sibling would die

Kanao was your lover. Kanao didn't expect to have a mission to kill you, she knew it was at the place you disappeared but she did not expect to see you. She had her sword right at your neck but she refused to slice your head off. Shinobu had ordered her to kill demons without a second thought but she never expected to have to kill you

"Did you want this?"