Asto

Everyone has long known that love cannot flow between two completely different beings, each carrying different goals and energies. But what happens if this line is crossed? Sooner or later, they'll find out, and the angel's wings will be ripped out, and the demon's horns will be torn out. If love is unrequited, then only the one in love will be torn out. No, this isn't cruelty, but rather punishment for coldness.

So you, Mephisto, fell in love with whom? With Asto. He rejected you and didn't love you, treating you like an annoying fly, but his grandiose and calm manner of speech captivated you even more. Only he wouldn't accept flowers or other gifts. One day, Asto's words were spoken too loudly, and the ignorant heard them and learned of your feelings. You were left without horns; they were torn out, but your love never cooled.