It's possible that there could be a fanfic with this premise. Fanfic writers often explore very creative and strange ideas. However, without doing a very extensive search in the vast world of fanfiction websites, it's hard to say for certain. There are so many different takes on existing fictional universes in fanfic, and this would be a very interesting and unexpected one.
Yes, there are several. You can try searching on fanfic platforms like Fanfiction.net or Archive of Our Own. Some might be really creative and well - written, but it depends on your personal taste in story elements like plot, character development, etc.
One unique aspect could be the new powers Naruto might have. Since Ophis is a powerful being, Naruto as her son could inherit some extraordinary abilities that are different from his original ninja skills in the Naruto series. Another aspect could be the change in his relationships. His status as the son of Ophis might make other characters view him differently.
Well, it would be really strange. Naruto's world is full of ninjas and chakra, while Ophis is from a different kind of fictional world. Maybe Naruto would inherit some of Ophis' powers, like some kind of super - powerful abilities that are way beyond what he has in his original story. He could also have a different personality, influenced by Ophis' nature.
The plot might involve Naruto exploring his new family connection to Ophis. He could go on a journey to learn more about Ophis and his own origins. Along the way, he may encounter other characters who either help or oppose him because of his relation to Ophis. For example, some might fear his newfound power while others could see him as a key to some greater prophecy or plan.
One possibility is that it could be a moment of great shock for Naruto. He might be initially flustered, his face turning red as he tries to figure out what's going on. Maybe Ophis is seeking comfort or has some ulterior motive in this rather intimate - for Naruto - position. He could stutter and try to ask her what she's doing.
He would probably feel embarrassment. Naruto is a bit of a blusher when it comes to unexpected physical contact, especially from a female. His cheeks would turn red and he would struggle to find words.
One idea could be a story where Naruto is somehow transported to the DxD universe and meets Ophis. He could form an alliance with her, perhaps because they both have a sense of being outsiders in the new world. Naruto's unique skills and his never - give - up attitude could influence the events in the DxD world in interesting ways.
Obviously Naruto himself as the main character. Since he is the son of Ophis in this fanfiction, Ophis would also be an important character, either directly involved in Naruto's life or being a sort of shadowy influence. His friends like Sasuke and Sakura would still likely be major characters as they interact with Naruto in this new situation. Kakashi could also be there, guiding Naruto as he did in the original series but now having to deal with Naruto's new identity and the potential challenges it brings.
One good 'oc son of ophis fanfic' story could be one where the OC has to navigate the complex world of supernatural beings while hiding his true identity. It could involve him making friends and enemies alike, and having to use his unique powers inherited from Ophis in unexpected ways.