I lied. It's not a thought. It's a not at all cohesive babble.
So what if Crowley and Aziraphale - hear me out - adopted a kid? Like, they're living at South Downs and Aziraphale just shows up at the cottage with a literal 8 year old human? And Crowley's like 'fucking... okay.'
And they take care of this human kid. And they wow the kid with miracles, and as the kid becomes a teen, the kid's like 'pa, never do that again' when Aziraphale tries to do his magic act and he's all heartbroken because his kid doesn't like his magic act and Crowley has to comfort his angel?
And the kid becomes an adult, falls in love, and moves out, but Aziraphale finally caves and buys a modern phone so he can check in with the kid every day and the kid's exasperated but loves their pa and allows it.
And the kid gets their heart broken and moves back in and lives there for a while?
And Crowley and Aziraphale love this kid with everything they have?
And even then, it's not enough, because the kid dies anyway, and Crowley and Aziraphale find comfort in each other, and barely leave the house for a century - not even to eat or get alcohol?
But then they realize that being able to love this thing that they raised was worth the grief and they adopt another?
What if that happened?