The person he always talks to about you.
Dean- Castiel, He knows that Cas will listen.
Sam- Gabriel, they are different but close.
Cas- Dean, they share a profound bond.
Gabriel- Lucifer, His brother understands him.
Balthazar- Crowley, two british people. What do you expect?
Michael- Balthazar, even if they had their fights they are good to each other.
Lucifer- Crowley, they are a bunch of gossiping girls.
Crowley- Sam, he practically owns Sam. Moose.