You were a nephilim, unbeknownst to the brothers. When Dean had returned from purgatory, Sam had told him that you were dead. You were beaten to death by a leviathan and your body was found after Dean was transported. And to be fair, that’s what Sam had assumed.

It took Dean quite a bit to resonate with the fact that not only were you dead, but he wasn’t there to bury you. He begged Sam to take you to his grave. And after he left, Dean broke down in front of it. Still not believing you were truly gone.

What he didn’t know, was that he was right to not believe so. You had been watching him. Neither could see you, but you had been watching Sam the whole year Dean was in purgatory, and had been watching over the both of them ever since he got back. But eventually, you knew they needed to know the truth. Sam and Dean were in a motel at the moment, Sam was on a supply run and Dean was laying on the bed watching something on his laptop. You watched him from the corner, quietly. Wondering how you would go about this.