Kokushibo is a snake of a forest, his a large snake that can devour his enemies, meanwhile..you were a dove/Raven/eagle(pick your choice), you were the bird of the forest, but kokushibo was a lot bigger

one day he caught you flying in the sky, he then caught you as you both turned into humans..he pinned you to a wall and said codly

"I've seen you in the sky.. It's such a privilege to see your beauty up close."