Infection AU

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Listing Series

• Horrorkiller slop by Afraidofww3

  Fandoms: Undertale (Video Game)  

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

  15 May 2026

  Tags

  • Creator Chose Not To Use Archive Warnings
  • Butcherknife/horrorkiller
  • Horrortale Sans (Undertale)
  • Something New Sans | Killer (Undertale)
  • Apart of my infection au fic
  • Awkward Kissing
  • Siighhh I’m not really into kissing scenes so let me know if I got it wrong
  • Internalized Homophobia
  • Horrorkiller wins again! (Take that Nightmare’s homophobia!)
  • Ecto-Body (Undertale)
  • And by “it” I mean.. my peanits…
  • Implied/Referenced Sex
  • I got really into kissing scenes but I’m still a little messy so it isn’t perfect..
  • Cuddling & Snuggling
  • Mutual Pining
  • Sloppy Makeouts
  • Walking In On Someone(s)
  • Orgasm Edging
  • Moobs are basically man-boobs if you’ve never heard of them they’re GREAT
  • Ectobodies are actually used for things other than sex I’m sorry guys
  • I have like an eyelash in my eye right now and it’s PISSING ME OFF!!!
  • Eventual Smut
  • Yes killer.. rub his honkers in your face.. yes.. yes..!!! It’s all going according to plan.
  • “two bros chilling in the hot tub five feet apart cause they’re not gay!”
  • Curse you Monster by Meg & Dia on my Spotify playlist for these two
  • Chapter 1 currently being rewritten to be more gross and less bland and normal
  • First kiss your partner shoves their tongue down your throat and tries to play it off like they didn’t just tongue-thrust u
  • Might make someone with emetophobia feel ill so be warned

  Summary

  So basically horror and killer make out and it’s their first time so it’s awkward and it’s also my infection au so they’re in a city so there and im writing more so chapter 2 is just smut kind of guys ...

  Series

  • Part 1 of Infection AU

  Language:

  English

  Words:

  4,727

  Chapters:

  2/2

  Comments:

  1

  Kudos:

  9

  Hits:

  142

• Infection au by Afraidofww3

  Fandoms: Undertale (Video Game)  

  • Mature
  • Graphic Depictions Of Violence, Major Character Death
  • Gen, M/M
  • Complete Work

  29 Apr 2026

  Tags

  • Graphic Depictions Of Violence
  • Major Character Death
  • Horrortale Sans (Undertale)
  • Something New Sans | Killer (Undertale)
  • Dusttale Sans (Undertale)
  • Xtale Sans | Cross (Undertale)
  • Nightmare is mentioned and looms over the narrative
  • the infected are called Amalgamates haha funny umm undertale reference guys
  • Internalized Homophobia
  • Survival
  • spiderman i think we gotta kill this guy

  Series

  • Part 2 of Infection AU

  Language:

  English

  Words:

  2,817

  Chapters:

  1/1

  Kudos:

  1

  Hits:

  11