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1. Down By The Cave, Under The Bay by EmeraldsAndAmethyst

   Fandoms: Danny Phantom, Batman - All Media Types  

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

   20 Dec 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Danny Fenton/Jason Todd
   • Jason Todd
   • Danny Fenton
   • Alternate Universe
   • Alternate Universe - Merpeople
   • Half-Mer!Danny Fenton
   • Trans Danny Fenton
   • Weird Biology
   • Double Penetration
   • Double Penetration in One Hole
   • Biting Kink
   • Merpeople
   • Merperson Jason Todd
   • Merperson Danny Fenton
   • Merpeople Have Two Penises
   • Tentacle Clit
   • Additional Warnings Apply
   • Additional Warnings In Author's Note
   • Merpeople Are Bioluminescent
   • Unreliable Narrator
   • Unreliable Narrator Jason Todd
   • Egg Laying

   Summary

   Jason wasn’t used to strange mers in his space. This only partially had to do with being the biggest and meanest mer in his territory. It mostly had to do with his territory being so toxic even the King of Atlantis could barely tolerate it. He wished he could say it was surprising when a mer showed up from the city, but Gotham was a hell scape rife with trafficking of all things, including people.

   This new mer didn’t die though, and that sparked Jason’s interest.

   Series

   • Part 2 of Mer AU

   Language:

   English

   Words:

   12,717

   Chapters:

   2/2

   Comments:

   20

   Kudos:

   320

   Bookmarks:

   43

   Hits:

   2,491