Apparently the 'no hair' rule doesn't stick when one is asleep, because when Dean tucks his face into Cas's neck, Cas sifts a hand through his hair sleepily to cradle the back of his head. The bottle of Jack, thankfully, was capped and moved aside and Castiel ends up on his side, wrapped around Dean with their legs tangled.

Morning comes and Cas wakes before Dean does, blinking sleepily at the curtains lightening with the rays of sunlight behind them, then looks down at Dean.

And then looks down at himself.

Oh. Hello again.