Save Him from Himself

1-shot prompt fill. S6. Sam's running wild. Dean catches up to find his brother in a state that he doesn't care for. When he steps in to take control after learning it's what Sam wants they find that perhaps the key to returning Sam's soul isn't that hard as they an/Sam) *Angry/upset/wary!Dean & Drugged & soulless Sam that's rather agreeable for once* Wincest