Another Form, Another Time (Bill Cipher x Reader)

When Bill was on the cusps of Death's grip, Bill invoked the name of an ancient power - the Axolotl - so that he may dodge a pitiful end. However, he returns in a different form, as a human, and a different time, in the future. He may have returned as a human, but he may be able to turn the tables once again, but there is a catch: he had the misfortune of being birthed with a fraternal twin - you. What a sick joke. It's always twins. A pair of identical twin brothers were his downfall, two fraternal human children mucked up his plans, and now he was born to a body that has a twin sister. However, maybe you aren't too bad after all, and this could be to his advantage. He has one more shot, but now he has something more to lose.

(For reasons tied into the story, and to accompany Bill's appearance, the reader will be a petite Caucasian American with brown hair and yellow eyes. I apologize if this taints the immersion, but I will try not to mention the reader's in-story cannon appearance too often to keep up with the immersion.)