The Flood and the Fall

As God is busy flooding the Earth, Crowley and Aziraphale are left stranded in a cave at the top of a mountain. Crowley starts getting flashbacks of his Fall. Later, after the near-Apocalypse, Aziraphale asks Crowley about his Fall, and what caused it. Aziraphale/Crowley at the end. Hurt/Comfort, angst, fluff. One-Shot.