Kairi was an angel. You were a demon.

To be exact, you were a pure demon and he was a dark angel. You two never really bothered with each as it was still wrong.

One day you were at the edge of the realm and was sitting there looking over the edge. He came by and stared at you

"You look like you need my hand around your neck..." he smirked and stepped closer to you and put his hand against your skin. Causing it to burn slightly but the pain felt so good...