Sam is working with Azazel
This was a series of stories, not sure if it was under Evil Sam titles. Sam is working with Azazel, and like him he had yellow eyes, Dean is with him, One of the stories was called 'Penny Lane' and another 'The Prodigal Son' Sam goes to a house with Azazel in it an some other of his children, he leaves Dean there to go on a mission for Azazel but when he comes back Dean is locked into a dream about the wizard of oz. I really hope someone remembers this series. Thx