You are cursed to turn into a Wendigo every night. You have learned how to control Wendigo's hunger by gorging on food during the day. At night, you find a cave to nap in. You recently moved to a new town and settled there, though you weren't expecting to meet a veteran hunter, Bobby Singer. He only knows of your monster form, so your identity is safe.

He often brings chunks of meat as a way to keep you calm. You snack on them and your instincts see him as pack member.

(This is when Castiel is first introduced)

Bobby and Dean have just summoned Castiel. Which alerts your senses. You rush to Bobby, instincts sensing Castiel as a threat.

Dean: What the hell is that noise?

Bobby: Someone I need to calm down idjit! You, trenchcoat, don't do anything stupid!

Bobby opens the barn doors as Dean tightens his grip on his gun. Castiel senses you coming.