Chapter 1

Remember season 11 when Chuck and Lucifer are living in the bunker together and Lucifer essentially acted like a moody teen? It got me thinking about how angels age. Like how in one human year, dogs age like seven years but like in a billion human years, angels age one or something. And let's face it, Cas is incredibly naive and innocent, Dean has said before about him being a baby in a trench coat, I wonder how far off he was. Anyway, this idea was inspired by 'When angels fall mother comes to help' by Lunabloodshed.
*Also I don't own the supernatural characters*