Even when they'd first met, Cas had been able to see right through his bluster and lies. Seriously, he'd appeared like a freaking guardian angel and had taken out a rather pissed off rival of Dean's who been just about to kill him. Then he'd taken one look at Dean's bruised and broken face and said 'You don't think you deserve to be saved.' (Contract killer AU, one-shot)

Castiel is falling, again. Sam is without hope. Dean is a demon. So when Castiel gets it into his head that he should attempt the Hell Trials and save Dean, Sam goes along with it, seizing the chance to save his brother, no matter what the cost. And when Cas's true intentions are finally revealed, it's already far too late to go back.

The light of a rainy summer day slowly faded away, dropping below the horizon until the room he was using as a sanctuary was drowned in shadows. He shouldn't have gone out, he should've stayed behind…

It's almost beautiful, He muses, in a twisted sort of way, in the same way that a lion stripping flesh from a zebra is a wondrous sight to behold. (Season 7 canon divergence - Godstiel)

Lucifer fought Michael, Lucifer fell, and Lucifer was trapped in the cage. (one-shot)