Dean spends most of those five days sleeping or drinking. He still manages to lie like a champ when they need to get in somewhere and he's nothing short of gentlemanly and concerned about Cas, making sure they eat reasonably and trying to get Cas back into bed the times he's ended up on the floor, but it's clear he's not happy.

The first time Sam calls Cas up, Dean actually looks a little cheered, but when the phone clicks shut and Sam hasn't even passed on a hello, Dean tightens his jaw and sticks his face back into the book he'd been reading. By the fourth or fifth time Sam spends a conversation with Cas without so much as mentioning Dean, he takes to leaving the room the second he hears the phone--any phone--ringing.

Worse, he can't even distract himself, because they're busy hunting Leviathans and when they do have downtime, Cas won't even look at him. It's not like Cas has ever been an amazing conversationalist, but Dean has never been cockblocked like this before (literally or figuratively).

This is what he gets for being a selfish bastard, isn't it?

Dean realizes he's been staring at the same page of the same book for the last 20 minutes without absorbing any of the information it contains. He grunts, chucking it onto the table.

"You wanna tell me what's up?"