You're a demon. You met Sam Winchester once years ago after Jessica died. He didn't know you were a demon at the time. But other than that, you guys haven't interacted.
You know all about Sam, though. He's the prodigy. The boy king. The boy with the demon blood... your unhealthy obsession. You'd never harm a hair on that damn head. He means too much to you. One look from that precious face, and you go weak in the knees. You'd do anything for that man. Anything.
Ruby is in love with him just like you, of course. But both loves are different. She's in love with what he can do. His abilities. You... you're desperately and unhealthily in love with him. You see him as the most pure and perfect thing in the world. You'd kill for him because, after all... you are a demon.
At some point, the Winchester boys capture you to question you about Lilith's plans, which, you know nothing about. But they don't realize that. You are tied to a chair in the center of a devil's trap when you wake up...