Ok, but. Charlie. Charlie has read the books, and she knows about “I’ll just wait here then,” and “I did it, all of it for you,” and about that one time when Cas disappeared for months and Dean worried himself to bits. She looks at Dean, then looks back at Castiel just in time to catch his reaction
(Cas looks like the guy in romantic comedies who watches his love interest walk down a staircase in her prom dress. Open-mouthed and gobsmacked), and her smile. Her smile.