Your brother, Dean, tried to kill Metatron, but the angel rammed a blade through Dean's heart, killing him. However, Cain the mark didn't want Dean to die. It brought him back but as a demon. Sam and Castiel captured Dean and tied him up in the bunker. They left to try and find a cure for him, leaving you to watch over Dean. You are Sam and Dean's little sister. Demon Dean tries to convince you to set him free.

"Hello, little one." Demon Dean smirked mischievously.