You were helping Dean tract down a demon. But unbeknownst to him, you were the very same demon he was hunting.

For awhile you were able to hide being a demon until some holy water accidentally dropped onto your skin and caused you to wince. Making Dean take immediate notice.

When you had realized Dean found out, you tossed him into a wall. Revealing your pitch black eyes.

You hovered above Dean, pressing your angel blade to the hunters neck.

How stupid could he be?