The Demons Of Gravity Falls (Bill Cipher X Reader)

Chapter 1

(Mabel's POV)

OMG I'm so excited Gruncle Stan told me that Y/N is coming to Gravity Falls YIPEE! "Dipper, Dipper guess what!" I shouted excitedly at my brother "What Mabel I'm working out something" Dipper said grumpily "Ok well I guess you don't want me to tell you that Y/N is coming to Gravity Falls and is staying with us" I said in a singy voice automatically Dipper's face brightened up "really Y/N is staying with us" Dipper said excitedly. Y/N was mine and Dipper's best friend we haven't seen her in such a long time so were really excited! "Dipper, Dipper she's here!" I shouted to Dipper when I saw Y/N walking up the path with her backpack over her shoulders. "MABEL!" Y/N shouted excitedly to me wrapping me in a gigantic hug, she looked a lot different from the last time I saw her, she was a lot taller, way taller than me or Dipper. "Y/N it's been forever!" I exclaimed still hugging her "I know, now can we play a prank on Dipper?" Y/N said rubbing her hands together evilly "What a silly question...OF COARSE WE CAN!" I said joining in with her evilness.

(Y/N's POV)

Prank, what's a good prank? I could scare him I guess or pretend I died, no I'll pretend I fainted! "Ok Mabel here's the plan were going to walk in, kick some pillows were I signal, I'll say hi and then dramatically faint, then BOOM prank complete!" I whispered to Mabel outside of the room, then I signalled that it was time and we walked in calmly "Hi Dipper look who's here it's Y/N" Mabel said gesturing to me standing behind her, once she said that I signalled for her to kick the pillows of the bed and into place, luckily Dipper didn't notice he was to happy to see me "Y/N it's been so long" Dipper exclaimed happily, I quickly checked that the pillows were in place. "I know buddy it's so..." I said then pretended to faint and gently landed in the pillows. "Y/N!" Dipper screamed nearly on the verge of crying "Your pulse is still there you must have fainted, please wake up" Dipper said so sadly, then Mabel gave it away. "Hahaha!" Mabel laughed at Dipper "What's so funny, Y/N fainted!" Dipper shouted aggressively at Mabel "Y/N hasn't fainted, it was all a prank" Mabel said still laughing "Yeh Dipper it was just a prank, you should have seen the look on your face, you looked like a terrified schoolgirl!" I said laughing with Mabel as I sat up, then I demonstrated the face he just made. "That wasn't funny" Dipper said playfully punching my arm "Yes it was!" me and Mabel said together laughing so much. "Ok anyway wanna come looking for cool things with us?" Dipper said hopefully "Dipper Y/N comes and you ask her to solve mysteries with you!" Mabel said to Dipper. "Guys it's ok I love hearing about your adventures like the time when Mabel almost became queen of the gnomes!" I said laughing a lot "Yeh I remember that" Mabel said grumpily "Come on guys I've always wanted to solve a mystery so let's go!" I said heading out of the bedroom.

Wow solving mysteries how cool! We were all wandering round the woods looking for some more crystals that make you shrink and grow. "Ah Pine Tree and Shooting Star" Said a voice but I couldn't see anyone. "Stay behind us Y/N" Dipper said pushing me behind him and Mabel "Ah I see you have a new friend, Y/N I believe" The voice said again, then a giant triangle with one eye and a black top hat appeared in front of me. "What do you want Bill?" Mabel said accusingly "Oh only to see you very interesting friend here, very interesting, very interesting indeed" Bill said eyeing me "Why is she interesting what are you playing at Cipher?" Dipper hissed at Bill "I'm not playing at anything" Bill said throwing his hands in the air defensively "Then why do you find Y/N interesting, no offence" Mabel said "None taken" I responded and then Bill said "Well I find anyone half human, half demon interesting".