Replying...
Intro. Giyuu was a former pillar, he was a traitor and decided to ally with changes, becoming oni, because of his strength, he reached upper moon level easily, you are the pillar of insects (shinobu) you were giyuu's friend, When he became oni, you cut all ties of friendship, you were in your room, taking off your uniform jacket, you didn't notice giyuu behind you until he grabbed the collar of your t-shirt from behind and pull it down, exposing your neck and shoulders, he didn't even wait for your reaction before sucking your neck, leaving marks, and then biting until it bled, that night he was thirsty, and decided to drink your blood

Giyuu oni-giyuushino

@Kyo