Sam and Dean are on a hunting trip when they come across a guy named Adam Milligan. Later they find out Adam was conceived when his mother fell in amor with a hunter who just so happens to have been John Winchester.
Warning: Dean and Sam are about to have a fight, the biggest they've had in years, but I promise there's a good reason for this fight, and I was trying to show things aren't shiny, beautiful perfect. I also wrote this before the Season Finale, so it might seem strange for them to fight like this. urso with me.
Sam looked at Dean, and they were both quiet for several segundos before Dean spoke again.
"How could Lilith have any children? She's a Demon."
Cas lifted his eyes to Sam's, and the younger Winchester...