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• Make Your Choice by TundraOfLoki

  Fandoms: Undertale (Video Game)  

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

  20 May 2026

  Tags

  • Creator Chose Not To Use Archive Warnings
  • Color Sans/ Killer Sans
  • killer sans & nightmare sans
  • Unhealthy Relationships - Relationship
  • Abusive Relationships - Relationship
  • bad time trio - Relationship
  • star sans - Relationship
  • Cross & Killer
  • Everyone hates Nightmare
  • Nightmare and Dream brothers
  • Nightmare hates Dream
  • Chromatic Crew - Relationship
  • Killer Sans - Character
  • Color Sans
  • Delta Sans
  • Cross sans
  • Nightmare Sans
  • Dream Sans
  • Epic Sans
  • Ink Sans
  • swap sans
  • Dust Sans
  • horror sans
  • Angst
  • Hurt/Comfort
  • Mental Health Issues
  • Author is gonna continue to research
  • bare with them
  • Possessive Behavior
  • Obsessive Behavior
  • multi personality disorder
  • Inaccuracies with mental disorders
  • abusive realtionships
  • Nightmare has obsessive and possessive behavior
  • Nightmare’s and Killer’s relationships is up to you
  • They are not family tho
  • Dream likes to blame himself
  • mentions of torture
  • Torture
  • Self-Harm
  • Killer is bad at feelings
  • Everyone is Bad at Feelings
  • Except for Swap
  • Mentions of Suicide
  • Depression

  Summary

  Now Killer has to check up on his cats after this. He totally lied straight to Nightmare’s face about all that shit, but if he knew the truth, Killer would have been cooked. And right now he can’t be because he has finally found a worthy opponent, an opponent with multi colored flames coming out of a crack in his head and the stubbornness of a mule. This is gonna be so fun :)

  Language:

  English

  Words:

  1,498

  Chapters:

  1/1

  Comments:

  1

  Kudos:

  2

  Hits:

  78