Our Ally? (Bill Cipher x Reader)
(Y/N) (L/N) was an adventurous and witty person. When (Y/N) travels to a place called Gravity Falls, she encounters two strange savior twins, a mystery enemy, and an all too familiar demon. Will an old friend help (Y/N) and the twins? Or will he backstab her, just as he thought she did, all those years ago.
<Sorry, if you're male. You can just replace all the girl/female/she/her verbs with the male version. I'm not trying to discriminate. I don't own Gravity Falls either.>