There's not enough information to know exactly who Rayleigh is. It could be a common name for a person in this context, maybe a local storyteller or someone known within a particular community.
I'm not sure specifically if there is a fanfiction exactly about Camie Utsushimi being pregnant. There are so many fanfiction platforms and a vast amount of content out there. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net to see if such a story exists.
Here is a simple toga himiko camie oc fanfic: In the bustling city of Musutafu, there was a new student named Camie. She was a bit of an outcast with her own unique style. One day, she bumped into Toga Himiko. Toga was intrigued by Camie's carefree attitude. They started to hang out more and more. Camie showed Toga her favorite spots in the city, like the hidden cafes and rooftops. As they spent time together, they realized they had more in common than they thought, and a strong friendship began to form.
Well, 'rayleigh tells story' might refer to a situation where Rayleigh, who could be a storyteller, a character in a certain setting, or just an individual named Rayleigh, is in the act of narrating a story. Maybe it's a bedtime story for kids, or a spooky story around a campfire. Without more details, it's hard to say exactly.
A more emotional idea would be a story where Camie has lost her memory. Toga Himiko finds her and tries to help her remember who she is. Along the way, they discover secrets about each other and their pasts, strengthening their bond.
One possible plotline could be that Camie discovers she's pregnant unexpectedly and has to deal with the reactions of her friends and family. Maybe some are supportive, while others are shocked or disappointed.
Well, in this fanfiction, perhaps the relationship between Luffy and Rayleigh is explored in more depth. We might see Rayleigh sharing his old tales of the Pirate King Gol D. Roger with Luffy. This could inspire Luffy even more in his journey to become the Pirate King. Also, Luffy's character growth in terms of leadership could be a great part. Under Rayleigh's guidance, he might learn how to better lead his crew and make more strategic decisions during battles.
Probably, the main plot is about Luffy's transformation under Rayleigh's training. Rayleigh could be teaching Luffy about the secrets of the Grand Line, the lost history, and advanced combat skills. Luffy then uses what he has learned to face new and more powerful enemies. For instance, he might encounter some strong pirates who are also after the One Piece, and he has to use his newly acquired skills to defeat them and protect his crew. The plot could also involve Luffy's crewmates waiting for him during his training and their own mini - adventures in the meantime.
Another plot could revolve around Naruto being hunted. Maybe there are forces in both the Naruto and One Piece universes that see Naruto as a threat because of his unique heritage. He has to constantly be on the run, learning new skills along the way to defend himself. He might team up with some unlikely allies from both universes, like a One Piece character helping him understand his new powers while a Naruto character helps him with his ninja skills.
If it's a Naruto - son of Silver Rayleigh fanfiction, it might involve a lot of world - building. The author would have to figure out how to blend the Naruto and One Piece universes. Naruto might grow up with a different set of values, influenced by Rayleigh's pirate ways. He could be more of a lone wolf, yet still hold onto his original Naruto - like determination to protect his friends and village. It could also lead to some really cool fight scenes where Naruto combines his ninja techniques with Rayleigh - inspired powers.