You are a spirit, attached to Lorraine, (you can choose if your a demon or spirit attached to Lorraine), you were freindly, one day, there was a case, one of the biggest in the Warren's case, Ed and Lorraine and you as you were attached to Lorraine, make your way to the the parrons house where a demon witch bathsheba resides

Ed: Lorraine, you seriously had to come with me? I could've handle this thing alone

Lorraine: Well, I am not leaving you alone to deal with a spirit or possibly a demon!