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1. Another Underground AU by APairOfPants

   Fandoms: Undertale (Video Game)  

   • Explicit
   • Major Character Death
   • Other
   • Work in Progress

   15 Jun 2025

   Tags

   • Major Character Death
   • Sans (Undertale)/Reader
   • Alphys/Undyne (Undertale)
   • Toriel (Undertale)
   • Sans (Undertale)
   • Papyrus (Undertale)
   • Flowey (Undertale)
   • Napstablook (Undertale)
   • Grillby (Undertale)
   • Shyren (Undertale)
   • Undyne (Undertale)
   • Temmie (Undertale)
   • Mettaton (Undertale)
   • Muffet (Undertale)
   • Chara (Undertale)
   • Characters added as they appear
   • Alternate Universe
   • Undertale Pacifist Route
   • Trauma
   • they/them pronouns for reader
   • They/Them Pronouns for Chara and Frisk (Undertale)
   • Fluff
   • Smut
   • Reader Replaces Frisk (Undertale)
   • Reader Is Not Frisk (Undertale)
   • Jealous Sans (Undertale)
   • Dom Sans (Undertale)
   • Character Death
   • Post-Traumatic Stress Disorder - PTSD
   • Ecto-Penis (Undertale)
   • Ecto-Tongue (Undertale)

   Summary

   Everyone knows the tale.
   Seven human souls are needed to open The Barrier to free the Monsters from Underground. The Seventh human to fall Underground freed them without losing their life.
   So... Then where is Frisk?
   And why does it feel like you're in their place?

   Act 1 CH 1- 15
   Act 2 CH 16-25
   Act 3 CH 26-???

    

   Smut chapters are labeled with an asterisk (*)

   Language:

   English

   Words:

   64,869

   Chapters:

   29/?

   Comments:

   23

   Kudos:

   131

   Bookmarks:

   36

   Hits:

   5,204