4.6 (2,031 ratings)

Unleashing Mayhem: Demon Bound, Book 4

Name: Unleashing Mayhem: Demon Bound, Book 4
Rating: 4.6 (2031 reviews)
Author: Grae Bryan
ISBN: B0FS85FCP8

by Grae Bryan

demons

About this book

Matteo has spent his entire life running from shadows, his spirit fractured by a history of cruelty and torment. Even after being rescued by a powerful demon, he remains a man defined by his fear. When the ghosts of his past resurface, he makes a desperate, dangerous choice: he summons a monster even more terrifying than those hunting him. He calls upon Nightmare, a solitary, lethal demon who has never known the need for companionship—until he tastes the sweetness of Matteo’s soul.

This gripping MM paranormal romance expertly weaves together the intense dynamics of an alpha-hero and the high-stakes tension of demon deals. As Nightmare steps into the role of protector, he discovers a possessive, all-consuming devotion he never expected to feel. He is determined to prove that while their connection began with a contract, it is destined to last for an eternity.

Unleashing Mayhem is a masterclass in the succubus-incubus trope, blending dark, atmospheric thrills with a heartwarming found-family dynamic. If you crave a story where a tender human finds safety in the arms of a monster who makes the rest of the underworld tremble, this is your next obsession. Prepare for a scorching, emotional journey toward a hard-won happily ever after.

Publication Date: May 25, 2026
ASIN: B0FS85FCP8

Reader Reviews

Pure demonic perfection

August 16, 2025

💚🖤 Book Review 🖤💚 Title: Unleashing Mayhem Author: Grae Bryan Pages: 249 ⭐⭐⭐⭐⭐ ~ Matteo has spent his whole life haunted by fear, raised by cruelty, scarred by torment, and never truly knowing safety. When his past resurfaces, he does the unthinkable: summons a demon. But not just any demon, Nightmare. Solitary, feared, and utterly dangerous, Nightmare has never needed anyone… until he tastes Matteo’s soul. From that moment, he’ll stop at nothing to claim him. What begins as a summoning...

4 Stars

July 20, 2025

I'm so happy to finally have Matty's story. He was so sweet and tender and he deserved all of the good things. Nightmare was nothing like what I expected and his reaction to Matty from the start was beautiful and exactly what Matty needed. These two were absolutely perfect for each other and I loved seeing them bond. Matty softened some Nightmare's sharp edges and gave him the sunshine he was unknowingly in need of. I think I was just missing more story. I feel like the relationship could have...

5 stars

July 18, 2025

This series was so good. Finally Matteo got his happily ever after with the nightmare demon. This sorry had all of the best things, the main theme of which is possessive and protective main characters. Both Nightmare and Matteo grew as characters together. I'm not doing a very good job of explaining why this was 5 stars but I liked everything about it from Matteo overcoming his fears, to Nightmare's dark possession of Matteo. All of the elements of the story combined to make something...

Dark and intense

July 18, 2025

This was a topnotch ending to this series of demons and humans bonding. It was Matteo and Nightmares story this time and was dark and violent at times. Matteo has PTSD due to his stepfather...not deceased and his top goon who was tormenter and torturer for years and he has the scars to prove. Nightmare protects Mattie during his nightmarish dreams and waits for a summoning. finally Mattie breaks and summons this monster of a demon and Mattie is enthralled with Night Promising to painfully kill...

five stars for this book and the whole series!

July 23, 2025

This was a lovely end to the Demon Bound series. Matty and Nightmare were sweet beyond measure, and I so very much enjoyed seeing Matty get his perfect happy ending. An extra bonus was the visits from the past books’ couples (I always love to see Chaos especially, he just might be my favorite). The whole series will be a reread for me. I recommend it highly! )