I Don't Want to be Dangerous (Billdip Vampire au)

When Stanley and Stanford suddenly pass away one day while visiting Soos and Melody at the Mystery Shack, Dipper's perfectly planned life gets turned upside down. Torn away from his dream college where he was studying the paranormal just like his favorite (now dead) relative, and forced back to the place where the summer of both his dreams and nightmares took place. Gravity Falls. Following a mysterious voice into the woods, he ends up coming face to face again with his demons, Bill Cipher. Now Dipper has to juggle online school, suddenly changing species, learning to cope with the loss of his idol, and a new crush on his old nemesis. What a headache.
Dipper and Mabel are both 21 in this.
I apologize for the generic cover, I don't have time to draw one right now. I just want to get the first chapter out first.
Updates weekly if possible.