holydarkhallelujah:

“So, uh, who wears the pants in this relationship?” Dean snickers, much to Cas’s confusion. He looks from Sam to himself and answers that they both wear pants. Well, in public anyway, not so much behind closed doors. But most of that time is spent without clothes entirely, in which case neither of them wear pants, so he really doesn’t understand –

Sam shuts him up with a hand covering his mouth, his face beet red and Dean stifling his laughs by biting his fist. Cas doesn’t understand that either.