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1. The Dragon Heirs of the Black Family by SerpentOfEvil

   Fandoms: Harry Potter - J. K. Rowling  

   • Explicit
   • Underage Sex
   • F/M, M/M
   • Work in Progress

   15 Feb 2026

   Tags

   • Underage Sex
   • Regulus Black/Sirius Black
   • Regulus Black & Sirius Black
   • Orion Black/Walburga Black
   • Orion Black & Regulus Black & Sirius Black & Walburga Black
   • Sirius Black
   • Regulus Black
   • Orion Black
   • Walburga Black
   • Alphard Black
   • Arcturus Black III | Sirius Black's Grandfather
   • Narcissa Black Malfoy
   • Andromeda Black Tonks
   • Bellatrix Black Lestrange
   • Cassiopeia Black
   • Cygnus Black III | Walburga Black's Brother
   • Druella Rosier Black
   • Alternate Universe
   • Shapeshifting
   • dual form
   • shift between dragon and human forms
   • Dragon Sirius Black
   • Human Sirius Black
   • Dragon Regulus Black
   • Human Regulus Black
   • Fluff and Smut
   • Shameless Smut
   • Eventual Happy Ending
   • Morally Grey Sirius Black
   • Morally Grey Regulus Black
   • Mpreg | Male Pregnancy
   • regulus has a vagina
   • Hermaphrodites
   • Oviposition
   • Fake Marriage
   • Cheating
   • don't worry not in manor ships
   • Pregnant Sex
   • Sibling Incest
   • Blackcest | Black Family Incest (Harry Potter)

   Summary

   Sirius: During your absence, a human slipped a ring onto Regulus's finger. He treats us like royalty, and I even became a famous knight!
   Orion (Terrified): Are you telling me... you married your brother off to a human and went on a killing spree??
   Walburga (Furious): You dare let a humanblood stain The Noble and Most Ancient House of Black!!
   ...
   Sirius: Actually, the kid is mine and Regulus's.
   Orion (Baffled):Did you knock up your underage brother??And you're only one thousand nine hundred years old yourself??
   Walburga (Relieved): Toujours Pur! Never mind, carry on~

   Or...
   A tale of two dragon brothers who transformed into human form to live in the mortal realm. (And also a sweet and shameless smut)

   Language:

   English

   Words:

   2,592

   Chapters:

   1/?

   Comments:

   3

   Kudos:

   3

   Hits:

   28