It's hard for him to tell how drunk Cas really might be, mojo and all, and he's leaning pretty heavily on him, but Dean's okay with that. Cas can lean on him if he needs it. Where Dean gets frustrated is when Cas won't pick himself back up when the time's right for it -- but that's a story for another time, when Cas isn't tipsy.

He could let Cas's explanation sit, even though he doesn't believe it, or... He glances sideways at him, trying to read him as best he can from the angle they're at.

"That's the weakest story I've ever heard. What's bothering you?"

Sure, Cas looks happy, but the only times he's seen Cas like this is when something horrible was happening.