The genre you're exploring often thrives in dedicated spaces online, though it's a niche that walks a fine line between the raw, morally complex narratives some readers seek and the more standardized offerings of mainstream platforms. For well-written stories that treat infidelity as a central plot device rather than just a shock element, I'd look towards subscription-based romance sites that allow for more explicit and layered content. Sites like Kindle Unlimited can be a starting point, as many independent authors publish there with significant creative freedom, but you'll need to filter carefully using tags like 'dark romance', 'marriage in crisis', or 'betrayal'. The key to finding the plot twists you want is to seek out authors who are known for psychological depth; their work tends to use the act of cheating as the catalyst for a much deeper unraveling of secrets, identity, or power dynamics, rather than it being the sole event.
Another avenue is specific online communities and forums built around sharing recommendations for adult-themed fiction. These can be goldmines because members often dissect exactly what they liked about a story's structure—the moment a loyal wife's actions are revealed as part of a long game, or the twist where the 'other man' is connected to her past in an unforeseen way. I've found that stories which successfully integrate a genuine plot twist often come from writers who treat all characters with a degree of complexity, making the wife's motivations understandable, if not condonable, which in turn makes the eventual revelation land with more impact. It's that emotional plausibility, paired with the illicit thrill, that separates a memorable read from a forgettable one.
Finally, don't overlook curated lists on book blogs or social media book clubs that specialize in steamy or taboo romance. Searching for phrases like 'unfaithful heroine redemption arc' or 'cheating wife suspense' might yield more targeted results than broader terms. The best examples I've encountered are those where the infidelity is the first domino in a chain of events, leading to consequences in other parts of the characters' lives—blackmail, financial ruin, or a shocking alliance—that the reader never sees coming. The satisfaction comes from the narrative treating its own premise with seriousness, building a world where actions have weight and twists feel earned, not just sensational.