When Angels Deserve to Die.
My muse likes whacking me in the head when I listen to music. Chop Suey : System of a Down.
Basically, the dark one is a Fallen Angel. The blonde one is his old best friend, but he was not thrown from Heaven, even though they both did the same thing - had a child with a human. Disillusioned, the dark one killed his best friend and his human wife, but spared their innocent child - beginning a curse that would eventually result in his own death. And he regrets that his friend had to die - but does not regret killing him.
And neither has a name. :3 Ideas?