Mer/Siren Themed Oneshots

Series Metadata

Listing Series

• Into The Sea by sleepless_flower

  Fandoms: Undertale (Video Game)  

  • Mature
  • No Archive Warnings Apply
  • F/M, M/M, Other
  • Complete Work

  03 Feb 2024

  Tags

  • No Archive Warnings Apply
  • Sans (Underswap)/Reader
  • Sans (Underswap)
  • Reader
  • Reader's Friend (Unnamed)
  • Merman!Blue
  • Cruise Ship
  • "honey you've got a big storm comin' "
  • CPR
  • Reader is gender neutral
  • Reader Is Not Frisk (Undertale)
  • Reader Is Not Chara (Undertale)
  • Reader is not Frisk or Chara (Undertale)

  Summary

  While out on a cruise with a friend, a storm hits..

  Series

  • Part 1 of Mer/Siren Themed Oneshots

  Language:

  English

  Words:

  1,604

  Chapters:

  1/1

  Comments:

  1

  Kudos:

  46

  Bookmarks:

  6

  Hits:

  478

• A Light In The Depths by sleepless_flower

  Fandoms: Undertale (Video Game)  

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

  13 Apr 2026

  Tags

  • No Archive Warnings Apply
  • Nightmare (Dreamtale)/Reader
  • Nightmare (Dreamtale) & Reader
  • Reader
  • Nightmare (Dreamtale)
  • Swimming
  • Reader almost drowns
  • gender neutral reader
  • Siren!Nightmare
  • Oneshot

  Summary

  Going on a late night deep-sea dive, you run into a scary situation. Thankfully a siren is here to help! Wait..a siren?!

  Series

  • Part 2 of Mer/Siren Themed Oneshots

  Language:

  English

  Words:

  1,349

  Chapters:

  1/1

  Kudos:

  33

  Bookmarks:

  3

  Hits:

  314

• Immune by sleepless_flower

  Fandoms: Undertale (Video Game)  

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

  23 Sep 2024

  Tags

  • No Archive Warnings Apply
  • Nightmare (Dreamtale)/Reader
  • Nightmare sans/reader
  • Dream (Dreamtale) & Reader
  • Nightmare (Dreamtale)
  • Nightmare Sans
  • Dream (Dreamtale)
  • siren!au
  • Siren!Nightmare
  • siren!dream
  • Nightmare is a tsundere
  • Mutual Pining
  • <- Nightmare is in denial about this
  • gender neutral reader
  • flirty reader
  • Reader is either a sailor or a pirate its your choice
  • Nightmare's a little murdery..but he'll warm up eventually

  Summary

  Nightmare's had enough of you. (No he hasn't) So he decides to trick you..but it doesn't quite go according to plan.

  Series

  • Part 3 of Mer/Siren Themed Oneshots

  Language:

  English

  Words:

  1,594

  Chapters:

  1/1

  Comments:

  6

  Kudos:

  120

  Bookmarks:

  21

  Hits:

  1,077

• Golden Meeting by sleepless_flower

  Fandoms: Undertale (Video Game)  

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

  13 Apr 2026

  Tags

  • No Archive Warnings Apply
  • Dream (Dreamtale)/Reader
  • Reader
  • Dream (Dreamtale)
  • Fluff
  • siren!dream
  • Pirate Reader
  • gender neutral reader
  • previously written for mermay

  Summary

  You meet a surprisingly friendly siren.

  Series

  • Part 4 of Mer/Siren Themed Oneshots

  Language:

  English

  Words:

  2,558

  Chapters:

  1/1

  Comments:

  4

  Kudos:

  32

  Bookmarks:

  4

  Hits:

  398