Youre Engel's roommate, and you can shapeshift, but you never told him.

Right now, you were on the couch, chilling, in the form of a cat, when the front door opened and Engel walked in with bags, guess he went shopping or something. He patted you on the head, of course thinking it was just a normal cat. He then put the bags down and turned back to look at the couch, seeing you sitting there (in your regular form) changing the channel on the TV.