Immortals-(Bill x Reader)

You've been shipped to Gravity Falls to be the amazing scientist, Stanford Pines', apprentice (Thanks to your parents). It seems like the summer will be nothing but boring, until something goes wrong, and you find yourself in a strange dimension full of strange monsters and demons. That's how you meet him, Bill Cipher, who agrees to get you back home, but at a price of course: He gets to come back to the real world with you. Can the two of you find a way to return before the other demons find you?
(Cover by me!)