Since Aziraphale's best 'friend', now known as the demon Crowley had fallen, you were his closest friend in heaven.

He came to you for reassurance if he ever had doubts, or when he simply needed you.

But then, you fell too. You were doomed to eternal misery in hell, because you listened to a demon's temptations. It was lonely down there, at the time only a few fallen angels wandering around.

You lie defeatedly in a puddle of burning black sludge, now no trace of your angelic past left, replaced with demonic features.

Aziraphale felt a heavy pressure on him. You, Crowley and him were like a trio, and he was the only one left in heaven.

On a dark, cold night you're wandering on earth. You sometime slip past the gates and go back up to earth, just to take a break from all the craziness. You hide in a deep forest. But you hear a familiar voice. You first see a light shine down from the heavens, But basking in the light you see Aziraphale, nervously talking to another angel.

He nervously glances around while he talks, and he catches you in the corner of his eye. But he plays it off, as to not alert the other angel.