I've been obsessed with Starset recently, and I realized that quite a few of their songs remind me of Gravity Falls. A lot.  So, I decided to start doing a few AMVs with Gravity Falls!

Have this preview of the AMV for My Demons!  I'd say it's slightly AU, because in the context Dipper is frequently possessed by Bill and becomes more like him, so Mabel tries to help save Dipper from what he's turning into.