This is just a short piece of Castiel’s thoughts after Sam killed Alastair in ‘On the Head of a Pin’. His shock at Sam’s actions and his guilt at where the proceedings had left Dean. Just a one shot – NO SLASH.
The anges come up with a new game plan that horrifies Sam, Dean and Castiel; an old friend returns. Watch Supernatural s05e18 Point of No Return. The investigation and drama continues