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• The Beauty is a Beast by PassingLeaf

  Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)  

  • Explicit
  • No Archive Warnings Apply
  • F/F, F/M, M/M
  • Work in Progress

  06 Dec 2025

  Tags

  • No Archive Warnings Apply
  • Hashibira Inosuke/Shinazugawa Genya
  • Agatsuma Zenitsu/Kamado Tanjirou
  • Himejima Gyoumei/Shinazugawa Sanemi
  • Rengoku Kyoujurou/Tomioka Giyuu
  • Kamado Nezuko/Tsuyuri Kanao
  • Iguro Obanai/Kanroji Mitsuri
  • Hashibira Inosuke
  • Shinazugawa Genya
  • Kamado Tanjirou
  • Agatsuma Zenitsu
  • Tomioka Giyuu
  • Rengoku Kyoujurou
  • Shinazugawa Sanemi
  • Himejima Gyoumei
  • Tsuyuri Kanao
  • Kamado Nezuko
  • Kaigaku (Kimetsu no Yaiba)
  • Kanroji Mitsuri
  • Iguro Obanai
  • Tokitou Muichirou
  • Kochou Shinobu
  • Sabito (Kimetsu no Yaiba)
  • Alpha/Beta/Omega Dynamics
  • Alpha/Omega
  • Mating Cycles/In Heat
  • Omega Hashibira Inosuke
  • Alpha Shinazugawa Genya
  • Omega Kamado Tanjirou
  • Alpha Agatsuma Zenitsu
  • Omega Shinazugawa Sanemi
  • Alpha Himejima Gyoumei
  • Mpreg
  • Implied Mpreg
  • Discussion of Abortion
  • Alpha Kaigaku (Kimetsu no Yaiba)
  • Kaigaku Being an Asshole (Kimetsu no Yaiba)
  • Protective Shinazugawa Genya
  • Protective Kamado Tanjirou
  • Top Shinazugawa Genya
  • Bottom Hashibira Inosuke
  • Protective Shinazugawa Sanemi
  • Shinazugawa Sanemi is a Good Sibling
  • Soft Hashibira Inosuke
  • Hashibira Inosuke is Bad at Feelings
  • Protective Hashibira Inosuke
  • Shinazugawa Genya is Bad at Feelings
  • Everyone Is Alive
  • Soft Shinazugawa Sanemi
  • Consensual Sex
  • Safewords
  • Vaginal Sex
  • Rough Sex
  • Biting
  • Spanking
  • Aged-Up Character(s)
  • Omega Kanroji Mitsuri
  • Beta Iguro Obanai
  • Fluff and Smut
  • Smut
  • Separation Anxiety
  • Alpha Kochou Shinobu
  • Fluff and Angst
  • Beta Tsuyuri Kanao
  • Intersex Omegas
  • Zenitsu isn't a creep
  • No beta we die like canon Genya
  • Tags May Change
  • Mentioned/Implied Miscarriage
  • Omega Tomioka Giyuu
  • Alpha Rengoku Kyoujurou
  • Unplanned Pregnancy
  • Discussion of historical abortion methods

  Summary

  It was common knowledge that all slayers, around the age of 18, tsuchinoto rank and above were required to have a designated heat and rut partner to pair up with whenever one or both slayers' mating cycles occur. Each slayer is given the option to choose their designated partner, however both parties must agree to being each other's partner, if a slayer didn't choose a designated partner within six months a partner would be assigned to them at random.

   

  Unfortunately for Genya and Inosuke they ended up being randomly assigned to each other. But once their time together is over, will they still want to be with one another?

  Language:

  English

  Words:

  101,744

  Chapters:

  19/?

  Comments:

  81

  Kudos:

  461

  Bookmarks:

  52

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