Fic Rec!

This story is awesome. Though it's Dean/Castiel, I could read it as slashy gen just fine. Fantastic team free will dynamic, and I loved the view of Castiel through Dean's eyes and vice versa. Interesting MotW, huddling for warmth, desperate measures to save the day... It's all good, baby. Set post-S5, but no S6 spoilers.

I Cleanse the Mirror by anonymous
Mid-summer in Colorado and it's been snowing for three weeks. Dean and Sam's investigation turns to survival as they are hunted by an ancient, malevolent creature who seeks nothing other than to take their lives. Especially Cas's.