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1. Public Bookmark 59

   Not Weak by LazySintastic13 (EmeraldWriter) for EchoSol

   Fandoms: Undertale (Video Game)  

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

   09 Jul 2017

   Tags

   • No Archive Warnings Apply
   • Sans/Sans (Undertale)
   • UT!Sans/UF!Sans
   • Sans (Undertale)
   • kustard - Freeform
   • Alternate Universe - Underfell
   • Underfell Sans
   • Mating Cycles/In Heat
   • Alpha/Beta/Omega Dynamics
   • Alpha/Omega
   • Porn with Feelings
   • Porn with some plot
   • Overstimulation
   • Multiple Orgasms
   • no knotting
   • sorry fam

   Summary

   Red is an Omega in heat. And he refused to submit to anyone. Maybe Sans can change his mind.

   Oh wait, but Sans is also ...

   Well then. That'll be interesting.

   (Bad at Summaries, Spare me ><)

   Language:

   English

   Words:

   2,363

   Chapters:

   1/1

   Comments:

   16

   Kudos:

   558

   Bookmarks:

   59

   Hits:

   8,141

   Bookmarked by Cyan_skiesXD

   28 Oct 2025