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1. Fill him up by MoonMoom for mimstheword

   Fandoms: Undertale (Video Game)  

   • Mature
   • Creator Chose Not To Use Archive Warnings
   • M/M
   • Complete Work

   20 Mar 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • AfterDeath - Relationship
   • Sans/Sans (Undertale)
   • Sans (Undertale)
   • Reapertale Sans (Undertale)
   • Aftertale Geno Sans (Undertale)
   • afterdeath
   • Cockwarming
   • Smut
   • Dom/sub
   • BDSM
   • Light BDSM
   • Horrortale Sans (Undertale)
   • Alternate Universe - Human
   • Voyeurism
   • Aftertale Geno Sans/Reapertale Sans (Undertale)

   Summary

   This is a birthday present for a friend of mine! If you haven't read Fill The Void, read that first

    

   Reaper is teaching Geno some patience

   Series

   • Part 2 of Fill the Void

   Language:

   English

   Words:

   5,193

   Chapters:

   1/1

   Comments:

   9

   Kudos:

   25

   Bookmarks:

   3

   Hits:

   196