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1. Heat. by bumbumtsumu for Beaniibabii

   Fandoms: Haikyuu!!  

   • Explicit
   • Underage Sex
   • M/M
   • Complete Work

   22 Apr 2022

   Tags

   • Underage Sex
   • Miya Atsumu/Miya Osamu
   • Miya Atsumu
   • Miya Osamu
   • Omegaverse
   • first heats
   • Underage Sex - Freeform
   • Older Osamu
   • Atsumu is 11 years old
   • Alpha Osamu
   • Omega Atsumu
   • Atsumu has a pussy in this one
   • innocence kink
   • Breeding Kink
   • Size Difference
   • Bestiality (just mentioned)
   • Osamu is a really good big brother
   • osaatsu

   Summary

   “Atsumu, ya’ can’t keep calling me every time ya…” Osamu started as he opened the door to the room Atsumu was in, but shut himself right up the second he stepped in and got a whiff of Atsumu’s scent.

   “Nii-san…” Atsumu whines the moment the door closes behind him. Atsumu is presenting. He is about to go into his first heat, if his sweet scent is anything to go by. "It... It hurts, Nii-san... h-help me."

   -

   Or, the one where Atsumu is going through his first heat, and Osamu knows exactly how to help his baby brother out.

   Language:

   English

   Words:

   3,443

   Chapters:

   1/1

   Comments:

   14

   Kudos:

   800

   Bookmarks:

   77

   Hits:

   18,715