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What do you hope is in the future for Castiel?
"I would love to see him become more human and ultimately much less of an angel.
I think that would be a good arc for him to travel. That would be one really interesting
avenue to go down - another would be for him to become evil and a nemesis to Sam and
Dean. Who knows? He could become Bobby's lover! There's a lot that could happen to Castiel."

http://www.digitalspy.com/cult/s6/supernatural/interviews/a189419/misha-collins-supernatural.html

Bobby/Castiel?? REALLY??

I better start writing XD