Dynamical Change; The Series and Extras

Series Metadata

Listing Series

• Dynamical Change by Nightmares_Midnight

  Fandoms: Undertale (Video Game)  

  • Explicit
  • Creator Chose Not To Use Archive Warnings
  • M/M
  • Work in Progress

  17 Jan 2026

  Tags

  • Creator Chose Not To Use Archive Warnings
  • Dreamtale Nightmare Sans (Undertale)
  • Underlust Sans (Undertale)
  • Bad Sanses | Nightmare's Gang (Undertale)
  • Polyamorous Bad Sanses | Nightmare's Gang (Undertale)
  • Alpha/Beta/Omega Dynamics
  • How Do I Tag
  • Mating Cycles/In Heat
  • Undertale Skeletons in Heat
  • Underlust Alphys (Undertale)
  • Sub Dreamtale Nightmare Sans (Undertale)
  • Caring Dreamtale Nightmare Sans (Undertale)
  • Eventual Smut
  • Killer Sans (Undertale)
  • Horrortale Sans (Undertale)
  • Dusttale Sans (Undertale)
  • Xtale Sans | Cross (Undertale)
  • Error Sans (Undertale)
  • Omega nightmare sans
  • Pack Dynamics
  • Nightmare accidentally pack bonds with the lust brothers
  • Dreamtale Nightmare Sans Needs a Hug (Undertale)
  • Slow To Update
  • Not Beta Read
  • We die like Nightmares mental health

  Summary

  It's a fairly normal multiverse, however, Lust AUs seem to have figured out a way to combat their endless heat. The cure? Giving everyone a specified 'classification'. That being Alphas, Betas, and Omegas.

  One day though, Nightmare finds himself in one of these universes after a bad fight with his brother. What will happen when he's been injected with their 'cure'?

  Series

  • Part 1 of Omega Nightmare Fics because I'm obsessed
  • Part 1 of Dynamical Change; The Series and Extras

  Language:

  English

  Words:

  14,773

  Chapters:

  8/25

  Comments:

  72

  Kudos:

  166

  Bookmarks:

  26

  Hits:

  2,075

• A little help, please..? by Nightmares_Midnight

  Fandoms: Undertale (Video Game)  

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

  17 Jan 2026

  Tags

  • No Archive Warnings Apply
  • Sans/Sans (Undertale)
  • Xtale Sans | Cross (Undertale)
  • Dreamtale Nightmare Sans (Undertale)
  • Dreamtale Nightmare Sans/XTale Sans | Cross (Undertale)
  • Smut
  • Plot What Plot/Porn Without Plot
  • I think?
  • Alpha/Beta/Omega Dynamics
  • Beta/Omega
  • Short One Shot
  • Ecto-Genitalia (Undertale)
  • Ecto-Body (Undertale)
  • Ecto-Penis (Undertale)
  • Ecto-Vagina (Undertale)
  • Skeleton Sex (Undertale)
  • Mating Bites
  • Sub Dreamtale Nightmare Sans (Undertale)
  • Top Xtale Sans | Cross (Undertale)
  • Not Beta Read
  • we die like Nightmare dignity
  • I Wrote This Instead of Sleeping

  Summary

  Nightmare asks Cross for help dealing with his screaming instincts, so Cross does.

  Series

  • Part 2 of Omega Nightmare Fics because I'm obsessed
  • Part 2 of Dynamical Change; The Series and Extras

  Language:

  English

  Words:

  1,098

  Chapters:

  1/1

  Comments:

  1

  Kudos:

  45

  Bookmarks:

  6

  Hits:

  583