Crowley, oh Crowley

After saving the universe more then once, you could have thought that the angels and demons would accept the deep love of Crowley and Aziraphale.
But they didn't, and as punishment Aziraphale was ordered to kill Crowley with his holy sword. Crowley did not complain. There was no one he would love more to kill him than his one and only Soulmate and destined one. With closed eyes, he waited for his death.
But Aziraphale took only one life that day.
His own.
Because only one of them could survive, in this world so cold.
And the devil was cursed to never follow his late lover into the abyss.
Immortal, broken, twisted.
Seeing his hollow Godfather in this state of being, shattered the Anti-Christs heart, so he sends the mourning Immortal into another world.
A world where a possibility existed to meet his SO again.