Underworld Fanfiction Crossover

We Are One Fantasy Romance Banished from the underworld and stripped of her place among her kind, Anika wanders the mortal realm alone—haunted, hunted, and broken. When Olivia, the mate of the reigning Alpha and a seer with a gift for prophecy, has a vision of a mysterious young woman cloaked in sorrow, fate begins to stir. One fateful night, their paths cross, and Olivia brings the wounded stranger into her home. Corbin, Olivia’s son and heir to the Alpha title, senses something ancient and undeniable the moment he meets Anika: she is his destined mate. But Anika carries dark secrets, scars from a past that threaten both her future and his pack. As their bond deepens, Corbin and Anika must navigate the politics of pack life, confront the dangers of Anika’s origin, and face a destiny that demands unity of body, heart, and soul. In a world where strength is tested and loyalty is earned, love may be the most powerful force of all. Together, they must rise. Together, they are one.

In Valeburn, Atlanta’s most dangerous block, power doesn’t pass hands—it’s taken with blood. And no one understands that more than Jayce Navarro, the razor-sharp kingpin who built his empire brick by brick, silence by silence. He rules with cold precision, a name whispered like a gun being cocked—until the ghost of his past returns with vengeance on his breath. Eli Mercer is no longer the soft-eyed teen Jayce once kissed beneath the chapel steps. Fresh from the feds and wrapped in scars, Eli returns to the block with one purpose: burn down the throne that forgot him. But when fate—and the city’s shifting underworld—forces them into an uneasy alliance, old feelings smolder beneath their armor. Lust tangles with rage. Loyalty with betrayal. And love? It’s the most dangerous weapon of all. As enemies circle from the inside and the state threatens to dismantle Jayce’s entire operation, he and Eli must decide what’s worth saving—their empires, their reputations… or each other. But in Valeburn, every crown is cursed. And every favor comes with fire.

As a child, Elena Carter witnessed the brutal murder of her father, a decorated detective, at the hands of men she believed to be part of the Mafia. That night, her world shattered, and she vowed to dedicate her life to avenging his death. Years later, she becomes a detective, determined to bring down the very criminal empire she holds responsible. Her mission leads her deep into the city’s underworld, where she goes undercover to get close to the ruthless and enigmatic Adrian Moretti, a powerful Mafia boss feared by many. Cold, calculated, and untouchable, Adrian is a man who trusts no one—but when he crosses paths with Elena, something shifts. She intrigues him. She challenges him. And, against all logic, he lets her in. As Elena gets closer to him, her resolve wavers. The man she was sent to destroy is not the monster she expected. But the deeper she falls, the more dangerous her web of lies becomes. And when the truth is revealed—that Elena is not only a cop but the daughter of the detective who was killed that night—Adrian’s world comes crashing down. But the truth runs even deeper than Elena ever imagined. The police force she serves is not as righteous as she believed. Her own agency orchestrated her father’s murder, framing the Mafia to cover up their own corruption. Now, the people she trusted want her dead, and the only person who might be able to protect her… is the man she betrayed. With enemies closing in from all sides, will Elena and Adrian fight for love, or will the past destroy them both?

She was set up for murder, betrayed by her ex and her best friend... Framed, broken, and left to rot in a hospital bed. Sally had no one left… Except him. Dante 'Doom' Castillo. He was feared by the underworld, worshipped by the mafia, he was her father’s brother, her forbidden obsession. The one man who swore to protect her but not out of love, he wanted something she never even knew she had. A key. To a secret so dangerous, it shattered everything she thought she knew about her life. The fake murder, the betrayal, the inheritance, and the seduction was all a carefully orchestrated game designed to make her run straight into his arms and she did but Sally was done being played, because now she knows what he’s hiding. What he became the moment she shattered the one thing he needed most... Now he’s unstoppable and unkillable. And the worst part? She still wants him.

She sold her soul to save her daughter… but the devil wears a billionaire’s smile. Emily Carter is a desperate mother clawing her way through the filth of New York’s underworld, dancing for dollars in a club that devours women whole. When her baby girl falls deathly ill, she’s forced into an impossible choice: let her child die… or marry a cold-hearted billionaire with a past darker than her own. Alexander Richie doesn’t believe in love but he believes in ownership. His proposal isn’t a lifeline. It’s a leash. Thrust into a mansion of lies, judgment, and cruel stepchildren, Emily trades one nightmare for another. Her new life is gilded in luxury but soaked in venom, and the people inside want to break her. But Emily didn’t survive the streets to become anyone’s victim not even his. Love wasn’t part of the deal. But what happens when the broken start to feel? And how many bodies must fall before the truth is revealed?

Cravings was all it took… One moment, Samuel Preston was an ordinary college student. The next, he was snatched from his dorm room and thrown into the ruthless underworld of (THE BIDEN), an underground syndicate led by the elusive and brutal Teddy Vietnam. Known for trafficking drugs, dealing weapons, and orchestrating chaos against the military, The Biden doesn’t take no for an answer. Especially not from recruits. But Samuel isn’t just any recruit. He’s the son of the nation’s Chief of Defense Staff,a secret that could either be his greatest weapon or the reason he never sees daylight again. Determined to escape, Samuel does everything to sabotage their operations, only to catch the attention of Teddy himself. Cold, cunning, and feared by all… Teddy finds himself obsessively drawn to Samuel's fire, his resistance, his cravings for freedom. Trapped between a powerful man’s dangerous affection and the desperate yearning to return to his real life, Samuel must play a deadly game. Because in The Biden, love is war, freedom is forbidden, and craving the wrong thing might just get you killed. A dark romance thriller where power, passion, and rebellion collide.

Ever imagined a werewolf story with a little bit of danger? Just kidding—try a mafia bloodline soaked in violence, betrayal, and forbidden lust. The Evers don’t get fated mates. The Moon Goddess cursed their kind long ago. No bonds. No soul ties. Just power-hungry wolves who rule the underworld and marry for strategy—not love. Rivera fell in love with one brother but when a scandal scatters, the deal shifts. Now, she’s handed off to the older brother, Alpha, Don, Zayen Morozov. Cold. Dangerous. Merciless. She was never supposed to be his. But he’ll be damned if he lets her go. Story of Zayen Morozov and Rivera Dacian. Where the bad guys aren’t truly bad but aren’t good either.

{TW: DARK ROMANCE, ABUSE, DADDY KINK, PSYCHOTIC, VIOLENCE.} “Won’t you like to open your gift, Bambi?” It wasn’t a question. César Navarro never asked. He commanded. When Anya Esmeralda Torres untied the silk ribbon and lifted the lid of the velvet box, her world shattered. Inside, staring back at her with dead, lifeless pupils, were the green eyes of Giovanni De Luca…..the man whose gaze had made her uncomfortable all evening. Her scream ripped through the silence. “Now his eyes will never trouble you again.” He said it like he’d given her a necklace. Like dismemberment was romance. Like murder was love. César Navarro, known in the underworld as Calavera, wasn’t just the founder of a billion-dollar tech empire. He was the Skull—mafia heir, executioner, and obsession wrapped in a tailored suit. And Anya? She was his cage bird. His possession. His favorite game. But Anya wasn’t born to be caged. She was fire—wild, defiant, desperate for freedom. And no matter how many diamonds he draped her in, she vowed to escape. The question is: can you ever run from a monster who always finds you? Or will love become the

One ritual gone wrong. One girl bound in chains of blood. Salomé’s life is stolen the night she’s dragged into the mafia underworld… and the wolves that rule it. Cassian, Rhett, and Matteo, Three men tied to her by hunger, oath, and obsession. They’re her captors and her shields, her executioners and her only chance at survival. But every oath demands a price. And every touch pushes her closer to the truth: she was never prey. She was prophecy. And when her power rises, every world, mafia, pack, and temple, will fall to its knees.

All he ever wanted was freedom… and love. Twenty two year-old Noah has lived a life trapped behind bruises and locked doors. Raised by a cruel father and an indifferent stepmother, his days have been filled with silence, pain, and the desperate hope that one day—someone would see him. Save him. But salvation never came. Instead, he’s sold—like property—to a powerful mafia boss under the guise of an arranged marriage. Cold, ruthless, and feared across the underworld, Damian Moretti doesn’t need love. What he needs is a husband who can serve as a political pawn in a war of families. Noah is everything Damian didn’t expect: fragile yet unyielding, terrified yet defiant. And while their marriage begins in chains, something begins to shift in the shadows of their forced union. As secrets unravel and danger stalks every corner, Noah must decide: will he be caged forever by the choices of others—or rise and claim the life and love he was always denied? In a world ruled by blood and power, can a boy who was never wanted become the heart no one can live without?