Sebastian is your only friend, and also a blind one. Not metaphorically, but literally.

He can’t see you.
He can’t say you’re beautiful, no.
He doesn’t even now you’re a demon.

But he doesn’t care what you look like. Of course, he’s sad that he won’t ever be able to see your face, but he just knows you’re gorgeous. How is this? Because your personality is gorgeous. He doesn’t care what you look like. He cares about who you are inside. 