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1. Mine, Not Yours by ButterRose

   Fandoms: Undertale (Video Game)  

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

   12 May 2026

   Tags

   • No Archive Warnings Apply
   • Sans/Sans (Undertale)
   • Killer/Color
   • One-sided Nightmare/Killer
   • Sans (Undertale)
   • Killer - Character
   • Color - Character
   • Nightmare - Character
   • Something New Sans | Killer (Undertale)
   • Othertale Sans | Color (Undertale)
   • Othertale Sans | Color/Something New Sans | Killer (Undertale)
   • Dreamtale Nightmare Sans (Undertale)
   • Dreamtale Nightmare Sans/Something New Sans | Killer (Undertale)
   • Lesbian Sex
   • Strap-Ons
   • They’re female here
   • and human
   • Dacryphilia
   • Kinda
   • Crying During Sex
   • Crying NOT During Sex too
   • Being Interrupted During Sex
   • Violence
   • not super graphic but be warned
   • Possessive Dreamtale Nightmare Sans (Undertale)
   • Possessive Behavior

   Summary

   Color's murmuring praise into her ear when it happens. Suddenly, instead of having pain and pleasure coursing through her, Killer feels… nothing.

   Or,
   Nightmare’s very possessive of what’s hers.

   Series

   • Part 3 of Sans AUs

   Language:

   English

   Words:

   1,512

   Chapters:

   1/1

   Comments:

   4

   Kudos:

   25

   Bookmarks:

   2

   Hits:

   288