A fanfic could explore a friendship between Boa Hancock and Domino. For instance, Domino visits Amazon Lily and is initially met with suspicion but through her interactions with Hancock, they develop a bond. They could exchange stories about their different experiences in the world.
It would be cool to include some of the other Shichibukai in a fanfic with Boa Hancock. Maybe Doflamingo, and the fanfic could explore the power dynamics and political intrigue between them as two powerful figures in the pirate world. Their different personalities and goals would make for an interesting story.
There may be such a fanfic, but it's not something that I can directly recommend. Fanfics are a very personal form of creative writing. Some people might write a 'Naruto Boa Hancock' fanfic with a lemon aspect to explore different relationships or scenarios. You could try using specific search terms on fanfic search engines. Also, check the reviews and ratings of the fanfics to get an idea of their quality and whether they are something you'd enjoy.
One idea could be a fanfic where Boa Hancock has to team up with her former enemies to face a greater threat. Maybe a powerful new pirate crew that is causing chaos in the Grand Line and she has to put aside her pride for the greater good.
A plot could be centered around a competition. There's a grand tournament in the One Piece world and both Boa Hancock and Domino enter. They compete against each other at first but then realize there's a bigger threat behind the tournament and decide to work together to overcome it. This would involve detailed descriptions of their battles during the tournament and their changing relationship.
The theme of self - discovery can also be present. Hancock might discover new sides of herself because of her relationship with Luffy. For example, she could become more open - minded or learn to trust others more, which is a big step for her as the empress of Amazon Lily.
A big theme is also about breaking barriers. Hancock is a proud and strong woman from Amazon Lily, and Luffy is a carefree pirate. Their relationship in fanfics often shows how they break cultural and social barriers between them. For example, Hancock's tribe has certain traditions and views about men, but with Luffy, she defies some of those. Also, friendship is a theme as Luffy values friendship highly and Hancock becomes part of his circle of friends in a special way.
I'm not sure if there are extremely popular ones specifically focused on this concept. However, there are likely some out there in the vast world of fanfiction. You might need to search on dedicated fanfic websites like Archive of Our Own or FanFiction.net and use specific search terms like 'boa hancock hypnosis' to find relevant stories.
In fanfiction, Boa Hancock is often depicted as still being extremely beautiful and powerful. Her love for Luffy may be further explored, with different scenarios of how she might express it. She could also be shown as having more complex relationships with her sisters, perhaps mending some past rifts or facing new challenges together.
Well, a fanfiction involving Naruto and Boa Hancock could be really interesting. It might explore how their different worlds collide. Naruto, from a world of ninjas, and Boa Hancock from the One Piece world. Maybe in the fanfic, Naruto could be on a journey that somehow leads him to Hancock's island. And they could form an unlikely alliance against a common enemy.