Except he's not a mystery writer

No longer being updated

This is the home of the OTHER AU verse that has magically manifested itself inside of Chris's head. (Somehow, there's more than just gay porn in there.)
AU where Dean ends up being adopted at a young age by Kate Beckett's parents and grows up to be somewhat normal...if a bit more of a troll.

And this is the plot 

Dean was taken away from John when he was just six years old and ended up in the hands of Jim and Johanna Beckett, who adopted him and raised him as their own, alongside their daughter, the future detective, Kate Beckett.

Now, all grown up, Dean is a successful writer, living in New York City with Kate as his full time roommate and an angel that keeps crash landing into his living room when all he wants to do is just have a little alone time with his right hand.