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1. Mac & Dennis Start a Fight Club by verisimilitudin0us

   Fandoms: It's Always Sunny in Philadelphia  

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

   03 Jan 2026

   Tags

   • Creator Chose Not To Use Archive Warnings
   • Mac McDonald/Dennis Reynolds
   • Charlie Kelly & Mac McDonald
   • Charlie Kelly & Dennis Reynolds
   • Charlie Kelly & Mac McDonald & Dee Reynolds & Dennis Reynolds & Frank Reynolds
   • Dennis Reynolds
   • Mac McDonald
   • Charlie Kelly
   • The Gang (It's Always Sunny in Philadelphia)
   • Canon-Typical Behavior
   • Dennis Reynolds Has Big Feelings
   • Dennis Reynolds Has an Eating Disorder
   • Caring Mac McDonald
   • Minor Violence
   • Illiterate Charlie Kelly
   • Bisexual Dennis Reynolds
   • Gay Mac McDonald
   • do not be fooled this is not about a fight club
   • idk how to write that shit
   • this will be very self indulgent
   • Slow Burn
   • because it is macdennis

   Summary

   After drunkenly starting a three-man fight club, Mac and Dennis engross themselves in the tireless study of David Fincher's 1999 classic. So that they can properly run their fight club. Not for any other reasons.

   Language:

   English

   Words:

   4,632

   Chapters:

   3/?

   Comments:

   8

   Kudos:

   3

   Hits:

   72