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1. To the Core by SweetSoulLov3r

   Fandoms: Undertale (Video Game)  

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

   31 Aug 2023

   Tags

   • No Archive Warnings Apply
   • Sans/Sans (Undertale)
   • Nightmare/Killer
   • Nightmare (Undertale)
   • Killer (Undertale)
   • killermare - Freeform
   • Nightkiller - Freeform
   • Soul Sex
   • Soulmates
   • Alternate Universe - Soulmates
   • Romantic Soulmates
   • I hope you like banging
   • Cause I just banged this out out
   • Badumtss
   • FR though I hope you like fluff
   • Fluff
   • Fluff and Smut
   • Shameless Smut
   • I should say shameless fluff tho
   • Romance
   • Warning: so many feels
   • Not Beta Read
   • Dreamtale Nightmare Sans (Undertale)
   • Killer Sans (Undertale)
   • Nightmare Sans (Undertale) - Freeform
   • Who needs therapy when you can just fuck it out
   • Soul Sex as therapy
   • Kinda
   • Lots of crying too apparently
   • Self-indulgent fluff

   Summary

   Nightmare and Killer are already lovers, but Nightmare wants to take their relationship to the next level. He's ready to open up to Killer; is Killer ready for all that he has to give?

   Language:

   English

   Words:

   2,374

   Chapters:

   1/1

   Collections:

   1

   Comments:

   21

   Kudos:

   283

   Bookmarks:

   26

   Hits:

   3,208