Cecil is Possessed by Angels and Demons

What is Carlos going to do when Cecil gets possessed by a demon? Or when he gets possessed by Castiel the angel of the Lord? The Winchester brothers come to help. Set sometime between 'First Date, and 'Yellow Helicopters'. Set sometime after Cas, but if I get details wrong don't complain, where I am in the series is messed up. Please Read and Review! Rated K plus for some language.