Devilish Minds was inspired by pictures of reverse Dipper and Demon Dipper as well at the thought that Mabel choosing Stan over Dipper should have hurt him more that the show made it.
The tags say BillDip but as far as I'm concerned it's very slight if not even.
YOU ARE READING
Gravity Falls: Devilish Minds.
FanfictionDark¡Dipper. This is after the return of the real Stanford. After Mabel ignored Dipper's pleas to press the button. He feels betrayed.