It's one of those unfortunate circumstances, knowing or being related to someone because of fate and not choice. No one really wants to know Lucifer, but it's not as if he can escape this inevitability. Castiel gives her her space and leans back, looking up to the sky as if the answers will fall to him from there. He wishes it was that easy.

"Have you never heard the stories?" There's a sigh, something crumbling inside as he recalls them himself. "It's what you are that makes him angry."