When You Least Expect It

Season 1, after "Dead in the Water": Dean's always been a healthy guy, despite all the junk he eats and filth he's exposed to. So when he gets a little sick after the Lake Manitoc case, he doesn't think anything of it until it's almost too late, and the diagnosis he's given is something he never expected to hear. Sick/Diabetic!Dean, Caring!Sam. Written for a DeviantArt prompt. Gen.