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1. Be a Doll for Your King by Expanded_Medulla_Ossium

   Fandoms: Undertale (Video Game)  

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

   30 Jun 2026

   Tags

   • No Archive Warnings Apply
   • Sans/Sans (Undertale)
   • Nightmare Sans
   • Killer Sans - Character
   • Nightkiller - Freeform
   • Doll Fucking
   • Penis in Vagina Sex
   • Dreamtale Nightmare Sans (Undertale)
   • Something New Sans | Killer (Undertale)
   • Praise Kink
   • Degradation Kink
   • Both kind of?
   • Nightmare being softmare
   • Tentacle Sex
   • Tentacle Dick
   • Killer gets to fuck himself like everyone in the castle wanted
   • Not sure if this is what they meant though lol
   • Sexual Overstimulation

   Summary

   Killer leaves a cute and sexy present on Nightmare’s bed, opening himself up to a world of trouble in the process :)

   Series

   • Part 3 of Bad Sans Poly Drabbles

   Language:

   English

   Words:

   3,254

   Chapters:

   1/1

   Comments:

   10

   Kudos:

   81

   Bookmarks:

   9

   Hits:

   780