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   Siren's Song by SkellieUser666

   Fandoms: Undertale (Video Game), Horrortale - Fandom, leviathantale - Fandom  

   • Mature
   • No Archive Warnings Apply
   • F/M
   • Work in Progress

   16 Dec 2025

   Tags

   • No Archive Warnings Apply
   • Sans (Undertale)/Reader
   • Sans (Leviathantale)/Reader
   • Sans (Horrortale)/Reader
   • Siren Sans
   • Reader
   • Squid HT!Sans
   • Siren Monsters
   • HT Sans is called Horror
   • Humans named Horror
   • Possessive Sans (Undertale)
   • Obsessive Sans (Undertale)
   • Reader-Insert
   • Angst
   • Reader Is Not Frisk (Undertale)
   • Reader Is Not Chara (Undertale)
   • Female Reader
   • Soulmates
   • Obsessive Behavior
   • Possessive Behavior
   • Animal Instincts
   • Animalistic Behavior
   • Mating Cycles/In Heat
   • Alternate Universe - Horrortale (Undertale)
   • Sirens
   • Animal Traits
   • Possible smut
   • Protective Sans (Undertale)
   • Bara Sans (Undertale)
   • Courting Rituals
   • Mating Bites
   • Gift
   • Scent Kink
   • Mating Bond
   • Fluff
   • Possible Oviposition
   • Breeding Kink
   • Tentacle Sex
   • Pregnant
   • Pregnancy
   • Egg Laying
   • Eggpreg

   Summary

   You thought you were dreaming. You thought the song, the creature with tentacles and bones, those emotions you briefly if at all felt, all of it. Were just a dream.

   But that was far from true.

   Inspired by 'Ship In A Bottle' and 'Tilikum'

   Language:

   English

   Words:

   11,380

   Chapters:

   6/?

   Comments:

   123

   Kudos:

   736

   Bookmarks:

   159

   Hits:

   15,511

   Bookmarked by AverageArtAddict

   01 Jun 2026