Uncharted Desert Isle

I think I've been looking for this story since this season started, and didn't even realize it. This is so perfect and scary and sad, and while I don't want it to end this way, part of what makes it so damn scary is that I think it could. Because here's Sam, burning down the world, and he's still Sam, he's still Dean's little brother, he's not just some mindless evil thing, because this story is just about that slippery slope, and Sam's slow descent, and it's so plausible that it hurts.