Has the Devil's Son Fallen from Grace?

Satan x Lucifer

(Many of this story's settings come from the Holy Retirement Squad. Sources will be noted in the chapters.)

To find an heir, Satan, the God of Darkness, steals Lucifer, one of the beloved angels of God, the God of Light, and brands him with darkness.

After that, Satan, the supreme god of Hell, waits and waits for his chosen heir to arrive... Yet ten thousand years pass, and his heir still hasn't come to Hell.

So Satan starts to lose his cool...

The Irreverent, Chaotic, Down-to-Earth Theater Version

Satan: Why hasn't my Demon King arrived yet?! Why hasn't he fallen from Heaven?

Lucifer: I'm not falling. Get lost!

Jehovah: Heh...

Author: And so, God's plan succeeds √

Also: Please give my Western Crossover fic, Supreme Sorcerer and His Iron Can, a read.