Anti-Gravity Prologue

Bill Cipher is a regular 17 year old spending the summer with his twin, Will, in Antigravity, Oregon. When he finds a mysterious books with spells and pictures and descriptions of beings from other dimensions he decides to see if the book is fact or fiction.
Dipper Pines is a dream demon, though not the usual, make deals to ruin people's lives kind. He just wants to help people. So when he's summoned by a young man who obviously needs help, how can he refuse? And what happens when this guy makes him feel human emotions? Maybe even, love?

(I do not own Gravity Falls, that honor is to the wonderful Alex Hirsch. I didn't make the cover art, the art on the inside does not belong to me, I may post some of my own though)