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1. Promises Made In Open Waters by PleaseSendMeds

   Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)  

   • Explicit
   • Graphic Depictions Of Violence
   • F/M, M/M
   • Complete Work

   19 Feb 2026

   Tags

   • Graphic Depictions Of Violence
   • Bakugou Katsuki/Midoriya Izuku
   • Ashido Mina/Kirishima Eijirou
   • Sero Hanta/Todoroki Shouto
   • Bakugou Masaru/Bakugou Mitsuki
   • Aizawa Shouta | Eraserhead/Yamada Hizashi | Present Mic
   • Bakugou Katsuki
   • Midoriya Izuku
   • Kirishima Eijirou
   • Ashido Mina
   • Todoroki Shouto
   • Aizawa Shouta | Eraserhead
   • Yagi Toshinori | All Might
   • Sero Hanta
   • Bakugou Mitsuki
   • Bakugou Masaru
   • Midoriya Inko
   • Kaminari Denki
   • Yaoyorozu Momo
   • bkdk - Freeform
   • bakudeku
   • MyHeroAcademia
   • mha - Freeform
   • Boys Kissing
   • Fluff
   • Fluff and Smut
   • Smut
   • NSFW
   • Mates
   • matingrituals
   • MermaidAU
   • mermaidkatsuki
   • humanizuku
   • fated mates
   • sweetheart izuku
   • Protective Katsuki
   • Bakugou Katsuki Swears A Lot
   • Bakugou Katsuki is Bad at Feelings
   • Kirishima Eijirou is a Good Friend
   • Todoroki Shouto Needs a Hug
   • Ashido Mina is a Good Friend
   • Minor Character Death
   • Monsterfucking | Teratophilia
   • Todosero
   • Todoroki brothers - Freeform

   Summary

   Six-year-old Izuku freed a fierce young merman from a fishing line, sparking a secret friendship that lasted through the years.

   The gentle dreamer and the golden-tailed Katsuki met in hidden coves, sharing laughter, stories, and growing longing.

   When Izuku joined a merchant ship to survive, Katsuki surfaced one final time. They confessed their feelings and sealed their bond with a kiss beneath the moon.
   For one perfect night, everything felt right.

   Then came harbor whispers: pirates were hunting merfolk, their target the lost prince of the deep-fierce, explosive, royal.

   Izuku's heart stopped.

   The prince they hunted... was his Katsuki.

   Language:

   English

   Words:

   69,688

   Chapters:

   24/24

   Comments:

   6

   Kudos:

   61

   Bookmarks:

   19

   Hits:

   1,064