Unleash Your Demons by Keira Marcos

Title: Unleash Your Demons
Author: Keira Marcos
Fandom: Marvel Cinematic Universe
Genre: Time Travel, First Time, Kid-fic, Science Fiction, Slash, Het
Relationship(s): Tony Stark/Loki Odinson, Bruce Banner/Betty Ross
Content Rating: NC-17
Warnings: Death-Minor Character, Discussion-Torture, Discussion-Forced Body Modification, Discussion-Mass Murder, Murder, Kidnapping, Temporary Character Death. Spoilers (the entire MCU), Violence-Canon-Level
Author Notes: This fic was written and edited before I saw Avengers: End Game. I made the choice not to include any of that foolish shit.
Beta: Ladyholder & Jilly James
Word Count: 115,668
Summary: Tony Stark can’t live with the damage Thanos has done. Infinity Stones in hand, he makes a choice that will alter the fate of the universe.
Artist: Madley

Banner Art by Madley



I started this fic in October of 2018 and finished the final draft in March of 2019. It flowed out of me like water which was kind of stunning considering the fact that it was my first full-length MCU fic and a new pairing. My thanks to Ladyholder and Jilly for alphaing, betaing, Azure Hart for cheerleading, and Madley for my amazing banner art.

Cast Pictures

Robert Downey, Jr, Karen Gillian, Mark Ruffalo, Indira Varma, Renee Russo, Don Cheadle, Tom Hiddleston, Tom Holland, Chris Evans, & Sebastian Stan

Keira Marcos

The only thing holding me back from world domination is felony level procrastination.


  1. I can’t wait to read your take on fixing infinity war. Frostiron was my first MCU pairing too.

  2. Yaaaasss!!!

  3. Oh, my…. this looks like incredible! Initially when I got into MCU – I was a strict Stark and Rogers fan with a dash of Stark and Banner. But after Ultron, IM3, WS, CW and finally IW (I am in complete and utter denial – EG does not compute, it does NOT exist!). I love love love and adore Loki/Tony fics. There is a chemistry between them even in the very brief onscreen times they’ve shared…. So this will without a doubt be stupendous – Keira you always exceed expectations! G

  4. Wow, I cannot wait to see what you do with this universe. There’s so much potential and so much that can be fixed! Love this idea and the pairing. I’m dying to see what you do with Nebula! Thanks for all your hard work!

  5. Oh oh grabby hands. Seems wonderful.

  6. oh this is my cup of coffee right here. yummm.

  7. I’m so excited for Quantumbang to begin! Thanks to you all I have already finished all my week-end chores so that I have the entire week-end to read….yay for the authors 🙂

  8. PhoenixRising253

    I’m stoked Keira is kicking this off with a bang! What a great way to start the weekend!

  9. Pausing in my reading to say how much I’m loving everything about this. I cried happy tears when Jinsen appeared. And tony’s friendship with Nebula is made of awesome. Ok back to reading.

  10. This was so amazing, I cried and laughed, then promptly recc’ed it to a friend as a stepping stone into a new fandom for her. Everything is brilliant! Thank you for such a fantastic read! xxx

  11. Beautiful story. Loved every second of it that i was allowed to read it. Great familiy of choice. I hope we will see more of that Au Universe you created. Thank you for sharing.

  12. WOW, this story is AMAZING. I absolutely loved it. This is definitely going on my reread list.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.