Forcing Change (Human! Bill Cipher X Reader)

You were one of thirteen girls chosen to be the infamous Bill Cipher's pets. A bit of info you'll need to know first, though:
Although I encourage not only female but male readers to read this, I'll be writing this with the reader being female. Now, onto your description.
You are a twelve-year-old girl with (s/c), (h/l) (h/c), and (e/c) eyes that convey every emotion you feel. You're tall for your age, standing at five feet and nine inches, but you're by no means lanky. Since you hit puberty early due to Weirdmaggeddon, your body developed fast. You don't have huge breasts, so to say, but they are a decent size. Your ass, though not flat or small, is not very big.
All your life, you lived on the streets. You've never known your parents or anything. At one point, you found yourself in a strange little town known as Gravity Falls in Oregon. For a summer, you stayed there and became fast friends with the Pines twins. From them, you learned more about the oddities of the place, eventually even becoming one of Dipper's trusted consoltants.
After that, you left the town in search of some more strangeness, but that's when hell erupted. And that, my readers, is where this story begins.
Fair warning: this story WILL contain cursing, and lemons, and quite possibly depression. Read at your own risk.
-y/n: Your Name
-l/n: Last Name
-h/c: Hair Color
-h/l: Hair Length
-s/c: Skin Color / Skin Tone
-e/c: Eye Color