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1. The Devil Inside of You by pessimistic_frog

   Fandoms: Undertale (Video Game)  

   • Explicit
   • Graphic Depictions Of Violence, Rape/Non-Con
   • F/M
   • Work in Progress

   20 Jul 2026

   Tags

   • Graphic Depictions Of Violence
   • Rape/Non-Con
   • Sans (Undertale)/Reader
   • Sans (Undertale)/Original Female Character(s)
   • Reader
   • Sans (Undertale)
   • Papyrus (Undertale)
   • Alphys (Undertale)
   • Undyne (Undertale)
   • OCs
   • Undertale Ensemble
   • Alternate Universe - Dictatorship
   • Alternate Universe - Fellswap Gold (Undertale)
   • sorta - Freeform
   • Alternate Universe - America
   • Reader is a Named OC
   • with a description
   • no beta we die like men
   • Eventual Smut
   • Enemies to Lovers
   • Hippy x dictator
   • Dead Dove: Do Not Eat
   • Corruption
   • Minor Character Death
   • minor original characters
   • Dubious Morality
   • very dubious
   • Napoleon Complexes
   • Stockholm Syndrome
   • Angst
   • facism
   • Oppression
   • American Politics
   • Gun Violence
   • Graphic Depiction of Injuries
   • Body Shaming
   • Gender Confusion
   • Ball Gags
   • Kinky Freaky Shit
   • more tags to come...
   • Forced Marriage
   • inspired by napolean's love letters to josephine
   • but sans doesn't become a redpill bro
   • the absolute grayest of morals
   • no black and white here
   • world building
   • Slow Build
   • Slow Burn

   Summary

   Your dad always told you to stay away from demons. To stay away from monsters.

   And you did. For a while.

   But what if the devil himself seeks you out?

   And what if he's the nicest man you've ever met?

   (My own AU, OverTakeTale, inspired by FellSwap Gold)

   Language:

   English

   Words:

   9,085

   Chapters:

   2/?

   Comments:

   4

   Kudos:

   14

   Bookmarks:

   4

   Hits:

   160