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1. The fear of falling apart by Purplish_pen

   Fandoms: Invincible (Cartoon 2021)  

   • Explicit
   • No Archive Warnings Apply
   • M/M, Other
   • Work in Progress

   01 Jun 2025

   Tags

   • No Archive Warnings Apply
   • Mark Grayson | Invincible/Rex Splode | Rex Sloane
   • Mark Grayson | Invincible
   • Rex Splode | Rex Sloane
   • Omega Beta Alpha dynamics
   • Omegaverse
   • Mark Grayson is intersex
   • Mark Grayson wants to be an omega
   • Alpha Rex Sloane
   • Vaginal Sex
   • Oral Sex
   • Explicit Sexual Content
   • Intersex Characters
   • Trans Friendly
   • Vaginal Fingering
   • Age Difference
   • because Viltrumites
   • Dirty Talk

   Summary

   After the Guardians of the Globe were murdered by an unknown assailant, Mark Grayson thought his entry to superheroing would be simple— fill in the gaps. Only the 'needs' you can fill are different if you're a pup, or an omega (by choice if not design), and he's got way too much ground to cover in figuring out exactly what his role would be.

   He hopes it'll be with Rex, the cocky alpha who flirts like crazy and doesn't seem to mind Mark's brand of omega.

   When the GDA doesn't know what to do with you, it's up to you to figure out your place, right?

   ---

   Or,
   Viltrumites are violent.

   Omegas are sweet.

   What if Mark's both?

   Language:

   English

   Words:

   28,904

   Chapters:

   8/?

   Comments:

   87

   Kudos:

   202

   Bookmarks:

   31

   Hits:

   4,931