: Decide if the feature is a content discovery tool (finding similar titles) or a utility (a tool for couples to communicate).

: Given the adult themes of the source material, ensure end-to-end encryption for any user-generated content.

To develop a feature around Ange Elle’s Envies libertines, nos couples se mélangent (Libertine Desires, Our Couples Mix), you could focus on an interactive storytelling or social discovery tool that mirrors the book's themes of exploring fantasies and shifting relationship dynamics. Potential Feature Concepts

: Use a "midnight" or "boudoir" design language—darker tones with elegant, minimalist typography to match the libertine genre.

: A guided "journaling" feature where users can privately explore and categorize their boundaries and desires, similar to how characters in libertine literature navigate new experiences.

: If this is for a reading app, a feature that allows users to swap perspectives between different characters in a "couple mix" scenario to see the same event through multiple eyes.

: A feature for storing sensitive creative writing or personal notes, reflecting the private nature of these fantasies. Development Steps