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1. Pet by poisonouslittleviper

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

   • Explicit
   • Graphic Depictions Of Violence
   • F/M
   • Work in Progress

   13 Jun 2025

   Tags

   • Graphic Depictions Of Violence
   • Mark Grayson | Invincible/Original Character(s)
   • Mark Grayson | Invincible/Reader
   • Mark Grayson | Invincible & Reader
   • Mark Grayson | Invincible/Original Female Character(s)
   • Mark Grayson | Invincible & Original Character(s)
   • Mark Grayson | Invincible
   • Sinister Mark Grayson | Invincible
   • Alternate Mark Grayson | Invincible
   • Mark Grayson
   • AU
   • Alternate Universe
   • Viltrumites (Invincible)
   • Service Submission
   • Non-Sexual Submission
   • he's actually insane
   • She is just trying to live
   • Blood and Gore
   • Trauma
   • Rating May Change
   • Slow Burn
   • Reader-Insert
   • Eventual Smut

   Summary

   A mundane day at the office turns into a blood-soaked nightmare when a masked figure arrives with a mission.

   Invincible AU. Loosely based on the "Sinister Mark" character.

   Language:

   English

   Words:

   57,100

   Chapters:

   20/?

   Comments:

   483

   Kudos:

   1,068

   Bookmarks:

   124

   Hits:

   19,329