Desperate Measures (слэш)

The transition from college to business ownership was supposed to be smooth and easy, but that was before Dipper’s roommate was used as a host vessel for a demon that can’t seem to leave the Pines twins alone. The only possible solution to a decade-old problem is a ritual that binds an immortal and a mortal’s souls and minds together until death, but what Dipper has to give in return has consequences of its own.
An old grudge, a motive for murder, a catalyst for the apocalypse, and a hell of a lot of confusion. He never wanted this.