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1. Geeks in Love (we make each other smile) by FruitbatTheCat

   Fandoms: Undertale (Video Game)  

   • Explicit
   • No Archive Warnings Apply
   • Other
   • Complete Work

   19 Aug 2026

   Tags

   • No Archive Warnings Apply
   • Sans (Undertale)/Reader
   • Sans (Undertale)
   • Reader
   • baby’s first smut
   • Smut
   • Ectopussy
   • Ectussy…
   • No Use of Y/N for Reader-Insert
   • Named Reader
   • Nonbinary Reader-Insert
   • First Time
   • service top reader
   • author would rather be doing science than sex and it probably shows
   • Sensory Deprivation
   • No dirty talk only nerdy talk
   • religious trauma
   • AFAB reader - Freeform
   • Fluff
   • Fluff and Smut
   • no AI
   • Fuck AI

   Summary

   Neither you nor your datemate have the highest libido, but it was bound to happen eventually.

   (In which you and Sans are in lesbians together on a cold December night.)

   Language:

   English

   Words:

   4,980

   Chapters:

   1/1

   Comments:

   1

   Kudos:

   26

   Bookmarks:

   2

   Hits:

   264