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1. Once Upon a December by BlueBerryOatmeal

   Fandoms: Gravity Falls  

   • Explicit
   • Graphic Depictions Of Violence
   • M/M
   • Complete Work

   01 Oct 2025

   Tags

   • Graphic Depictions Of Violence
   • Bill Cipher/Dipper Pines
   • Alternate Universe - Historical
   • Alternate Universe - Criminals
   • Alternate Universe - 1920s
   • Period Typical Attitudes
   • Human Bill Cipher
   • Aged-Up Character(s)
   • Alcohol
   • Violence
   • Sexual Content
   • Slow Build
   • Obsessive Behavior
   • Lies
   • Mistaken Identity
   • stylized writing
   • Smut
   • mobster bill cipher
   • Conman Dipper
   • Stan's there too
   • Slow To Update
   • I'm Bad At Summaries
   • I Wrote This Instead of Sleeping
   • because I have insomnia
   • Exposition Heavy At the Start
   • Dipper Pines Needs a Break
   • Angst with a Happy Ending
   • dysfunctional functional relationship
   • Mutual Pining
   • Porn With Plot
   • Unhealthy Relationships

   Summary

   December 20th, 1920 - Dipper is pushed into the most dangerous con of his life: steal a priceless necklace from a man who may not be all he seems. All the while pretending to be someone he's not. Trapped on a train together, Dipper can see how easily things could get out of hand.

   Language:

   English

   Words:

   43,162

   Chapters:

   6/6

   Comments:

   37

   Kudos:

   140

   Bookmarks:

   29

   Hits:

   2,515