[ he's just...going to follow dean in. clearly he's too pissed off to listen, so maybe if cas just lets him get all his misplaced anger off of his chest, dean will stop blaming cas for things he has no control over.
and in the meantime, cas can try to figure out just what he's going to do tomorrow.
also what to do with this jumping slobbering animal. aside from just...standing there and letting it do its...thing. maybe glare at it a little. ]