Dean was used to hunting monsters. He was used to hunting deadly things with sharp teeth and glowing eyes that wanted to suck the life out of him. He wasn't ready to hunt one with bright blue eyes and soft lips that used to whisper secret I love you's into his skin and heal his scars. When Cas makes a deal to save Dean's life and turns into Hell's messenger, Dean, Sam and Bobby set out on an impossible task. Angst, tears, pain, and heartbreak ensue.