Underworld Fanfiction Crossover

In the bustling city of New York, a notorious womanizer and underboss of the underworld, Scott Mancini, finds himself in an arranged marriage with Allegra Rossi, a sweet and spirited choir girl who has been raised with rigid religious values. Despite her captivating charm, Allegra's appearance is modest and old-fashioned, often dressed in layers that make her look like a wedding cake—but not in a delectable way. Her bold and assertive nature, however, irritates the egoistic Scott, especially when she shows no interest in him. Nevertheless, Scott has always been one to embrace challenges, and he realizes that wooing Allegra won't be an easy feat. As their wedding day nears, the question on everyone's lips remains - will Allegra be the one to finally tame Scott Mancini, or will she be consumed by the dark and dangerous world that he inhabits?

"Run all you want, little wild rose… but you’ll never escape me." Nirvana’s life was supposed to be simple…until betrayal sold her to the devil himself. RAyNe St Trinity is cold, cruel, and untouchable, a man who rules the underworld with blood-stained hands and an unforgiving grip. Now, she’s his possession. A pawn in his ruthless game. She resists. He enjoys the challenge. She begs for freedom. He tightens his hold. But as the lines between obsession and desire blur, Nirvana realizes escaping RAyNe isn’t just impossible…it might be the last thing she wants. And when danger closes in, she’s forced to ask herself the one question that terrifies her most… What if the man she fears is the only one who can save her?

Cleo Benson’s world is shattered in an instant when she loses her entire family in a tragic accident. But as the grief takes hold, a darker reality emerges. Cleo is thrust into a deadly underworld as collateral for a debt she never knew existed. Enzo Russo, a cold and calculating mafia kingpin, offers her a twisted deal: 12 months as his bride, and then her freedom. Determined to survive and seek revenge against those who betrayed her, Cleo plays along with Russo’s dangerous game. But as she navigates this ruthless world, she finds herself drawn into a deeper conflict; one that pits her need for vengeance against the unexpected pull of her own heart. Will Cleo reclaim her life, or will she be swept away by the dangerous allure of the man who holds her fate in his hands?

A ruthless and banished Lycan King, has been cursed to suffer in the underworld for centuries, is unexpectedly summoned back to the mortal realm by Lyra, a weak but determined werewolf to help save her people from a powerful and dark force threatening to destroy them. Their initial animosity is palpable, and the tension between them crackles with distrust and suspicion. But as they face the brutal reality of war and destruction, their loathing for each other turns into an all-consuming, forbidden passion that cannot be quenched. However, their newfound love is not enough to guarantee their victory. Ancient prophecies and betrayals plague their path, forcing them to make unimaginable sacrifices to save their world. Their bond is put to the ultimate test as they face their greatest challenges yet, each decision they make carrying the weight of the fate of their people. Can their love conquer all, or will the darkness prevail, dooming them to a fate worse than death? In this tale of romance, betrayal, and sacrifice.

Elena Russo lost the one person who meant the world to her brother, and ever since then; she was deeply fueled by the strong urge for revenge on the family that murdered him. She dedicated her life to this cause as an understated waitress by day and a renowned genius hacker in the Mafia underworld by night. All her efforts to track down the Moretti family were useless. Everyone knew who they were, yet no one knew them. What happens when Elena decides to loosen up on a certain night and recklessly has a one-night stand with the same man she had been searching for all her life-Luca Moretti? And when she finds herself falling deeply for this same person, and facing a shocking revelation that all she had believed for years was nothing but a lie, what happens next? Why don't you find out?

"But my quest is not over. For in the name of all that is evil, I promise Athena, I will be back!" The story of Medusa continues, for when she was slain, her life didn't end, for it was yet to begin. As I walked into the great room, there stood Hades, black jeans and a tee, with a hue of blue......sexy hair. This couldn't get any worse... The goddess Medusa is back and vengeance is coming upon Olympus. Athena is in for the battle of her life as Medusa has the entire nation of the underworld at her command. Medusa would reign terror down on the gods and in return for his help, Hades wants Zeus' throne...... "You wouldn't kill your own role model Medusa darling?" Athena asked, the fear evident in her voice. "You started this war, I'm just doing you a favor by ending you in it."

Milo Petrov ruled Russia’s underworld with an iron fist. For years, I was nothing more than his possession—his plaything, his captive. His wealth and dangerous charm ensnared me, but I couldn’t escape the truth: I was nothing more than a pawn in his game. At just 19 years old, I never imagined my life would spiral so far out of control. He was ruthless, but everything about him intrigued me. The only problem? I had once loved his son, Andrew. Now I found myself torn between the deadly allure of Milo and the guilt of betraying Andrew, my first love. Could blood really be thicker than desire? My name is Emilie, and this is the twist story of how Milo Petrov took my heart and shattered my world.

“Stay still, Elena.” Alessio’s voice was a dark command against her ear. His hands pinned her wrists above her head as Gabriel’s lips trailed down her throat. “You’re ours now. No running. No escape.” Two ruthless mafia kings. One woman caught between them. Elena Rossi never planned to belong to the underworld, but when she witnesses a murder, she becomes their obsession. Alessio De Luca—cold, calculating, and possessive. Gabriel Moretti—reckless, dominant, and just as deadly. Instead of silencing her, they claim her, trapping her in a world of sin, power, and raw, unrelenting passion. But the deeper she falls, the more dangerous their secrets become. And when enemies close in, Elena must decide—can she survive being theirs, or will their love ruin her forever?

Dimitri's voice lowered, sending shivers down my spine. "Unless your goal is to get me hard princess, best believe I'll be using your tongue as my reliever." He traced his finger teasingly along my lips, making me blush even harder. ****** Nineteen year old Layla Bamford is the princess of Asentrix and is slated to marry the prince of Fremen but being fed up with her life being constantly dictated by her poisonous Step-mother who is the queen, Layla flees, only to land herself into the dangerous yet attractive hands of Dimitri Vikings. Dimitri is the most notorious underworld lord who heads one of Italy's largest Mafias. With a hidden identity, Layla must endure in the handsome and possessive yet brutal hands of Dimitri for her life may just depend on it.

Descended from two lines of assassins, Alina Istrati is one of the most prolific assassins in the world. Always taking pride in her work, the cold nature of her crimes paired with her modus operandi earned her the alias, Blackheart. A new contract that should have been a simple job proves to be more than she bargained for when she finds herself the target of the person who hired her. On top of that, she's stuck babysitting her former target, who intrigues her at every turn. Alina will be put to the test as she fights to uncover diabolical plots and uphold obligations in the assassin underworld while trying to maintain her Blackheart status around the man she was assigned to kill. Follow ADB_Stories on IG for series updates. Codename: Blackheart is the first book in the Codename trilogy.