Just imagine Dean kissing Cas for the first time, and Cas being completely shocked -
And Dean taking advantage of the momentary lapse to stab Castiel with the angel blade; the demon laughing as the life fades from those blue eyes.
And then imagine Cas covering Dean’s demon eyes as he sinks to the floor, trying to remember the real Dean. His Dean.
OH MY GOD
I have never in in my life seen a single episode of Supernatural and even I know this is not okay by any means.