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1. Got Everyone Watchin' Us (So, Baby, Let's Keep It Secret) by Reign_commander

   Fandoms: Undertale (Video Game)  

   • Mature
   • No Archive Warnings Apply
   • M/M
   • Complete Work

   20 Jan 2026

   Tags

   • No Archive Warnings Apply
   • Sans/Sans (Undertale)
   • Sans (Undertale)
   • Papyrus (Undertale)
   • W. D. Gaster
   • Underfell Sans (Undertale)
   • Underfell Papyrus (Undertale)
   • Sans/Underfell Sans (Undertale)
   • Alternate Universe - Undertale Multiverse | UTMV (Undertale)
   • Other Additional Tags to Be Added
   • Other Additional Sanses to Be Added
   • Multiverse Shenanigans
   • Rating May Change
   • Author has Into You stuck in their head
   • Scientist W. D. Gaster
   • Smoking
   • Missing Persons
   • Nonbinary Frisk (Undertale)

   Summary

   sans's life is weird, and as far as he's concerned, his brother doesn't have to know the extent of it. There's a padlock on the door of the basement for that exact reason. Cool inventions in there aside though, Papyrus has enough on his plate to deal with without having to comprehend multiverse theory.

   It seems that the multiverse will only give sans so long to tell Papyrus about his findings before it takes the situation into it's own powerful hands.

   Language:

   English

   Words:

   3,291

   Chapters:

   1/1

   Kudos:

   7

   Bookmarks:

   1

   Hits:

   97

2. Bookmarked by R3dWingX

   22 Jan 2026

   Public Bookmark

   Bookmark Collections:

   • reading undertale fics before i even play the game