Sarah Slean - Angel
The two of them look strange together. Their children seem perfect, carved out of clay to match each other exactly, but the men... they are singularly opposite from each other in every visible way. The little one looks like an angel, the taller one like a demon.
And yet, at night, behind closed doors, the one who carries the golden-white glow of heaven around him lets himself feel like the worst scum of hell, and turns over to tell the one with brimstone-red eyes that no, Kuro-sama, you're my guardian angel.
Sometimes the dark one isn't even sleeping when he says it.