A question about emotional authenticity in that subgenre makes me think of 'comfortably predictable' as a faint insult. Too often, 'real wife' plots are just a setup for forbidden lust: the neighbor, the sister's friend. But the authentic tension, when done right, isn't about newness at all. It's about confronting a well-worn, deeply known intimacy with a suppressed truth.
The friction comes from the history shared. A couple with inside jokes, a mortgage, maybe kids—their relationship has a public shape. Introducing a fantasy cracks that shell. The tension is in the quiet moments after: brushing teeth while wondering if your partner just imagined you with someone else, or the unspoken question of whether sharing the fantasy will break the comfortable script you've both followed for years. It's not will-they-won't-they; it's can-we-say-this-out-loud-and-survive-it. That silence is heavier than any seduction scene.
I read one where the wife's fantasy wasn't even about another person, but about being watched by her husband in a specific, vulnerable way she'd never articulated. The entire emotional arc was her finding the language for a need within an otherwise happy marriage. The risk wasn't infidelity, but the exposure of a private self.