Something about Cas missing the freedom of his wings, but knowing. Knowing, that no matter how freeing it may have been to fly, he was trapped. Wings unclipped, mind controlled, entire body bound to the compliance of Heaven. He knows, that though he may miss flying, he’s learning all the more. Free will, the freedom of life, of love. I think this is something he’d struggle to grasp, once being human a while. But, knowing Cas, he’d probably recognize after a long, long while of thinking.











