Supernatural: Dean/Sam.
This is fantastic; I love the slow reveal of what’s really going on, and Dean and Sam’s subtle shifts in personality and action as time passes. Also, I am a huge sucker for unreliable narrators and this story totally rocked that; I loved Dean’s perspective and how we learn what’s going on at the same time he does. It’s just such an effective narrative style for a story like this; wonderfully suspenseful. Plus! Werewolves!