Old Roles and New Pains

Set between 2x22 and 3x1: Dean's been avoiding Sam ever since told him about the deal. Sam knows Dean is more affected than he lets on, but he also knows that Dean's never going to show any kind of weakness in front of him unless he has no other choice. As it turns out, bottling things up is not a good way for Dean to avoid showing emotion. Migraine!Dean for an LJ prompt. Gen.