Power is a major theme. Two Lucifers would bring a lot of power into one story, and it can be about who has more power or how they use their power together.
The story of the 300 has elements of truth but also likely contains some fictionalized or exaggerated parts to make it more compelling. After all, storytelling often involves a bit of both.
I recommend the book "Yehan Deep Drunk Thoughts". It was an ancient romance novel. The plot was heart-wrenching and the writing was beautiful. It was a story about a man and a woman who had suffered deeply but loved each other sincerely. Their love transcended time and space and obstacles, and they finally got married. The entire novel is full of aestheticism, and it's not transmigration. It meets your requirements. I hope you like this fairy's recommendation. Muah ~😗
In the world of 'lucifer meets lucifer fanfiction', a common plot could involve a clash of egos. When two such powerful and complex characters meet, there's bound to be conflict. Some stories may also explore a romantic or at least a deeply emotional connection between them, as they are essentially the same being in different forms, and this connection can be both fascinating and disturbing at the same time.
I'm not entirely sure specifically what 'lucifer fiction' refers to. It could potentially be a genre of fictional works that somehow involve the concept of Lucifer, perhaps in a religious, mythological, or even a more creative and fictionalized context.
Lucifer can be a good comic depending on your preferences. If you enjoy dark and mythical themes, it's likely to appeal to you. The character development is strong, and the world-building is immersive.