I find it hard to implement at the beginning of a project but I find it very easy to implement once I find a bug. Fixing bugs by starting with a failed test make it easy imo.
This is a simple use of the openAI Python Library that creates a narrative in the style of the classic Choose Your Own Adventure books from my childhood. To run locally you'll need an openai API key. Check the stories folder for examples of previous users' ai generated stories.