What Are The Top-Rated RWBY Crossover Fanfics On AO3?

CAUTION! ❗️⚠️DARK ROMANCE. MULTIPLE STEAMY STORIES* Through Realms of Sins is a collection of taboo and steamy stories where passion knows no boundaries. In different worlds and timelines, an Omega woman becomes the obsession of powerful Alphas: CEOs, kings, mafia bosses, and supernatural beings.Every story would whisk you away into a world of dark romance and irresistible desire, where the lines between love and lust fade away. The Alphas are dominant, but the Omega is no helpless prize, challenging their control and unleashing parts of them that didn't even know they existed.This is an Omegaverse anthology filled with tension, power play, and fiery passion. Each story is hotter than the last, each loves a battlefield of strong desires. Enticing you through Realms of Sins which will leave you breathless for more.

This is raw, no-limits reverse harem erotica. Expect graphic multi-man scenes, rough claiming, breeding, public indulgence, total power exchange, and women who eagerly surrender to overwhelming pleasure. One woman. Multiple ruthless, devoted men who refuse to choose. Strictly 18+. One woman. Multiple ruthless men who refuse to share her with the world, but will always share her with each other. After a blindfolded night with one of her brother's four roommates, 21-year-old Lila sets out to identify the man who gave her the best orgasm and the only way is to sneak into their rooms and have sex with them. To inherit her billion-dollar trust fund, Bianca is forced to spend one month as the shared sexual companion to her three entitled older cousins. Undercover journalist Sadie infiltrates a college hockey team as a puck bunny to expose their gang but ends up in intense, furious sexual entanglements with the captain, enforcer, and rookie. From forbidden stepfamily estates and mafia penthouses to omegaverse knots and high-society auctions, these heroines don’t just get taken, they beg for more. Billionaires, alphas, stepbrothers, demons, and powerful enemies collide in tales of dark passion, obsessive proximity, and shameless corruption. Steamy, dark, and dangerously addictive, Shared & Ruined is pure filth for readers who crave women willingly overwhelmed by devoted, insatiable men. No limits. No jealousy. Only dripping, obsessive pleasure.

In a world where the moon shattered and the strong devoured the weak, Neoma Solstice is nothing. A scentless Null. A ghost. A mistake. Until the day she saves a dying Lycan warrior with a touch, and her secret is revealed: she's Void-Born, the rarest mutation in existence. The same power that makes her invisible makes her invaluable—a living weapon that can cure the incurable Feral Rot plaguing the Lycan Ascendancy. Captured and collared, Neoma is forced to serve as "Tether" to Unit Vanguard: four elite soldiers on the brink of madness. Barzil, the ruthless Commander who sees her as a mission. Wolfy, the cold Tactician who sees her as a puzzle. Viggo, the feral Berserker who sees her as salvation. Guller, the fallen Priest who sees her as redemption. They own her contract. They control her life. They swear she's just a tool. But tools don't make their masters kneel. As Neoma's power grows, so does the threat she poses to the regime that enslaved her. When the prophesied Blood Moon rises, she'll have to choose: remain the Ascendancy's battery, or become the Void that devours them whole. Some bonds are forged in blood. Some in magic. Theirs was forged in desperation—and it might be the only thing strong enough to save a dying world. The Obsidian Covenant is a dark dystopian reverse harem romance featuring a morally gray FMC, four obsessive MLs, found family dynamics, enemies-to-lovers, rejected mate redemption, and a slow-burn that explodes into high heat. Perfect for fans of The Cruel Prince meets Den of Vipers in a post-apocalyptic wasteland. No choosing. No apologies. No mercy.

Ruby Colton is unlike any other Omega you’ve ever seen. She’s bold, sassy, and has the smarts to keep her alive. Though she has no single strength or power because of her small wolf, she’s hard working enough to make up for her flaws with her quick wits and bright brilliance. Lucian Pierce, who is also known as the ‘Dark Devil’, has no place for troublemakers in his pack. But he contradicts this rule of his by himself when he usurps the Blue Sky pack where Ruby is from and gives the sly troublemaker a place in his pack. Ruby needs Lucian’s protection to live peacefully away from her psychotic adoptive brother who wants her gone. Lucian needs Ruby’s wisdom to keep his pack safe from an uprising of a dangerous new breed of rogues. Ruby and Lucian being together is a complex juxtaposition of contradictions. But what can they do when the universe wants them to be together and their fates are entwined? They have no choice but to be life companions in that case.

A she-wolf raised to believe she some day would be a rouge like her parents before her finds that fate has more in store.

Scarlet never believed in destiny—until she died. Now bound to a mysterious system, she awakens in the bodies of betrayed women across countless worlds. Her mission is clear: avenge the fallen, slap the traitors, and conquer the hearts of different untouchable men. From an academy ruled by gods in human form to kingdoms dripping in blood and betrayal to glittering cities where power is bought with desire—Scarlet must weave vengeance and temptation into every step she takes. She is no saint. She is no savior. She is the temptress who thrives on revenge, a woman whose charm is as lethal as her kiss. But with every world, every mission, and every heart she wins… Scarlet begins to wonder. Is she the player in this game of fate— Or the one being played?