Title: ab luce, ad ignis
Characters & Pairing(s): Castiel & Sam Winchester
Word Count: 18790
Summary: Because that’s how Castiel is looking at him right now, like he’s something worth admiring, and Sam doesn’t know what to do or how to handle it.
How Dean could handle it, he’ll never know.
A story in five parts. Season 9 AU.
Link to fic: AO3
Link to art: tumblr