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• all your sums and your pieces by physicsfailer, starry_window

  Fandoms: Undertale (Video Game)  

  • Teen And Up Audiences
  • No Archive Warnings Apply
  • Gen
  • Complete Work

  24 Jun 2026

  Tags

  • No Archive Warnings Apply
  • Minor Polyamorous Bad Sanses | Nightmare's Gang (Undertale)
  • Dreamtale Nightmare Sans (Undertale)
  • Passive Dreamtale Nightmare Sans (Undertale)
  • Horrortale Sans (Undertale)
  • Something New Sans | Killer (Undertale)
  • Dusttale Sans (Undertale)
  • Dreamtale Sans | Dream (Undertale)
  • Xtale Sans | Cross (Undertale)
  • XTale Chara (Undertale)
  • Multiplicity/Plurality
  • Dreamtale Nightmare Sans is Plural (Undertale)
  • there's 4 of them in there it's not just a ghost situation
  • Dreamtale Nightmare Sans & Passive Dreamtale Nightmare Sans (Undertale)
  • Childhood Trauma
  • Non-Chronological
  • Fluff and Angst
  • Movie Night
  • Hot Chocolate
  • Unreliable Narrator
  • fanon-typical violence
  • POV Multiple
  • Past Trauma
  • suicide joke
  • Self-Doubt
  • Loss
  • Possessive Behavior
  • Nesting
  • (nonperson character)
  • Bickering
  • Guilt
  • Minor Character Death
  • Violence
  • Dreams and Nightmares
  • Implied/Referenced Child Abuse
  • Childhood Memories

  Summary

  Centuries ago, the young guardian of Negativity, Nightmare, was killed by a terrible monster. That's what everyone always assumes; it's a nice, simple story, after all. It has villains and victims, the Corruption and the child, and an ending that wraps it up in a neat little bow. The dead can't complicate matters.

  But Nightmare is neither monster nor child, and no version of him died that day.

  An AU where "Passive", Nightmare, and "Corrupted" all survived, and cohabit the same body (although not with those names).

  Language:

  English

  Words:

  9,670

  Chapters:

  4/4

  Comments:

  21

  Kudos:

  70

  Bookmarks:

  11

  Hits:

  493

• Am I bad, am I bad, am I bad, am I really that bad? by physicsfailer

  Fandoms: Undertale (Video Game)  

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

  20 Aug 2025

  Tags

  • No Archive Warnings Apply
  • Sans & Sans (Undertale)
  • Sans/Sans (Undertale)
  • Sans (Undertale)
  • Sans Ensemble (Undertale)
  • Something New Sans | Killer (Undertale)
  • Dusttale Sans (Undertale)
  • Dusttale Sans/Something New Sans | Killer (Undertale)
  • Minor Polyamorous Bad Sanses | Nightmare's Gang (Undertale)
  • Implied/Referenced Sex
  • Unreliable Narrator
  • Killer thinks he'll be kicked out if he's blind (he wont)
  • Blindness
  • Swearing
  • Panic Attacks
  • Misunderstandings
  • Mild Hurt/Comfort
  • Domestic Fluff
  • as domestic as these guys get anyway
  • Nudity
  • its just bones!! but still
  • Stage 1 Killer Sans
  • a little. as a treat
  • now includes: attempts at waterboarding a skeleton
  • Soft Something New Sans | Killer (Undertale)
  • mentioned subdrop

  Summary

  [Title from Laplace's Angel by Will Wood]

  Killer wakes up unable to see. Again. Luckily, this time he isn't going to freak out. Probably. Maybe. Just don't think about how he's useless without his eyesight.
  Feat. Dust and Killer somehow being semi-functional together.

  Language:

  English

  Words:

  3,220

  Chapters:

  1/1

  Comments:

  5

  Kudos:

  102

  Bookmarks:

  13

  Hits:

  550

• Hey, I just met you, and this is crazy (but here's my number) by physicsfailer

  Fandoms: Undertale (Video Game)  

  • Teen And Up Audiences
  • No Archive Warnings Apply
  • M/M
  • Complete Work

  02 Aug 2025

  Tags

  • No Archive Warnings Apply
  • Sans/Sans (Undertale)
  • Sans (Undertale)
  • Sans Ensemble (Undertale)
  • Horrortale Sans (Undertale)
  • Something New Sans | Killer (Undertale)
  • Horrortale Sans/Something New Sans | Killer (Undertale)
  • Pre-Relationship
  • Past Violence
  • First Kiss
  • between these two
  • Kissing
  • Mentioned Dreamtale Nightmare Sans (Undertale)
  • Dreamtale Nightmare Sans/Something New Sans | Killer (Undertale)
  • In a grand total of one (1) sentence
  • Bad Flirting
  • Getting Together
  • Licking
  • they're just being stupid your honor
  • Copious amounts of talk about Killer's eye goop

  Summary

  [Title from Call Me Maybe by Carly Rae Jepsen]

  Curiosity killed the cat, or in this case, curiosity killed the Killer.
  (In which Killer wonders what the deal is with the black fluid leaking from Horror's mouth, and Horror wonders the same about Killer's tears. It leads to kissing, obviously)

  Series

  • Part 2 of Physics' on his HorrorKiller bullshit

  Language:

  English

  Words:

  1,379

  Chapters:

  1/1

  Collections:

  1

  Comments:

  3

  Kudos:

  85

  Bookmarks:

  9

  Hits:

  499

• I'm not a good person, I'm barely a person at all by physicsfailer

  Fandoms: Undertale (Video Game)  

  • Teen And Up Audiences
  • No Archive Warnings Apply
  • M/M
  • Complete Work

  30 Jul 2025

  Tags

  • No Archive Warnings Apply
  • Sans/Sans (Undertale)
  • Sans (Undertale)
  • Sans Ensemble (Undertale)
  • Horrortale Sans (Undertale)
  • Something New Sans | Killer (Undertale)
  • Nudity
  • i mean its just bones but still
  • Blood and Gore
  • Bathing/Washing
  • Swearing
  • SOUL Mechanics (Undertale)
  • Stage 1 Killer Sans
  • Dissociation
  • Hurt/Comfort
  • Minor Polyamorous Bad Sanses | Nightmare's Gang (Undertale)
  • Horrortale Sans/Something New Sans | Killer (Undertale)
  • Something New Sans | Killer Needs A Hug (Undertale)
  • He gets one!!
  • Purring

  Summary

  [Title from Against the Kitchen Floor by Will Wood]

  Killer tries (and fails spectacularly) at taking a bath. Hooray for missions that leave him covered in blood, right?
  Feat. Horror being here to support him at his lowest. What did he ever do to deserve this, really.?

  Series

  • Part 1 of Physics' on his HorrorKiller bullshit

  Language:

  English

  Words:

  2,883

  Chapters:

  1/1

  Collections:

  2

  Comments:

  8

  Kudos:

  118

  Bookmarks:

  13

  Hits:

  631