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   Cardiff Boy by withtheoldstars

   Fandoms: Harry Potter - J. K. Rowling  

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

   17 Nov 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Sirius Black/Remus Lupin
   • Minor or Background Relationship(s)
   • Regulus Black/James Potter
   • Sirius Black
   • Remus Lupin
   • Regulus Black
   • James Potter
   • Peter Pettigrew
   • Marlene McKinnon
   • Dorcas Meadowes
   • Lily Evans Potter
   • Mary Macdonald (Harry Potter)
   • Kingsley Shacklebolt
   • Alternate Universe - Modern Setting
   • Alternate Universe - College/University
   • Alternate Universe - Canon Divergence
   • Alternate Universe - Muggle
   • Alternate Universe - Boxing
   • Boxers
   • Boxer Sirius Black
   • Boxer James Potter
   • Teacher-Student Relationship
   • Hurt/Comfort
   • Falling In Love
   • Secret Relationship
   • Implied/Referenced Sex
   • Underground Fight Club
   • Happy Ending

   Summary

   Sirius was an underground boxer, and Remus was a professor at his university.

   When Remus gave his little brother a low mark and Sirius smashed his door down in response, he realised his life would never be the same again.

   Series

   • Part 2 of Fight Club Boys

   Language:

   English

   Words:

   119,956

   Chapters:

   11/16

   Comments:

   764

   Kudos:

   1,711

   Bookmarks:

   530

   Hits:

   81,600

   Bookmarked by Meepmorp398

   21 Jan 2026