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1. Rec 15

   Go Do the Mature Thing by rhinestone_cowgirl

   Fandoms: Invincible (Cartoon 2021), Invincible (Image Comics)  

   • Explicit
   • No Archive Warnings Apply
   • F/M, M/M
   • Complete Work

   13 Apr 2026

   Tags

   • No Archive Warnings Apply
   • Mark Grayson | Invincible/Reader
   • Rex Splode | Rex Sloan/Reader
   • Mark Grayson | Invincible/Rex Splode | Rex Sloan
   • Mark Grayson | Invincible/Rex Splode | Rex Sloan/Reader
   • Mark Grayson | Invincible
   • Rex Splode | Rex Sloan
   • Reader
   • Female Reader-Insert
   • Threesome - F/M/M
   • Rivals with Benefits
   • Jealousy
   • Anal Sex
   • Vaginal Sex
   • Oral Sex
   • Teasing
   • Switching
   • switch mark grayson
   • Switch Rex Splode | Rex Sloan
   • Voyeurism
   • Boys Kissing
   • Enemies to Lovers
   • Fluff and Smut
   • everyone is a switch
   • My First Fanfic

   Summary

   Mark and Rex are always at eachother’s throats
   They both are also into you, so you turn their tension into something more

   Language:

   English

   Words:

   4,741

   Chapters:

   1/1

   Comments:

   9

   Kudos:

   113

   Bookmarks:

   15

   Hits:

   1,815

   Bookmarked by salzxar

   29 May 2026