In fanfiction, if Hinata is portrayed as cheating, it could be for shock value. Writers sometimes want to create a big stir in the story.
Another reason could be that the author wants to break the typical image of Hinata. By making her cheat, it forces readers to see her in a completely new light and re - evaluate her character. It might also be part of a more complex plot involving love triangles or relationship problems within the fan - created world.
Maybe the author is exploring a 'what - if' scenario where Hinata's relationship has some underlying issues that lead to such behavior. It could also be an attempt to show the darker side of human nature even in a character like Hinata.
Since it's a fanfiction, the idea of Hinata cheating could be a very unorthodox and out - of - character concept. It might be the result of the author wanting to create a controversial or alternative storyline. But in the official Naruto lore, Hinata is not associated with such behavior.
One possible reason could be her deep love for Naruto. Despite her actions, she realizes that Naruto is the one she truly wants. Cheating goes against her values and her feelings for him, so she regrets it as she understands the harm it has caused to their relationship.
One problem is that it goes against the positive image of Hinata. Hinata is often seen as a pure and likable character, and a 'cheating' plot twists her character in a negative way. Also, the 'lemon' aspect means it may contain inappropriate sexual content which is not suitable for all audiences.
I'm not sure if there is such specific fanfiction. Fanfiction can cover a wide range of wild and unexpected scenarios, but this one seems rather unethical considering the original relationships in the Naruto series. It's also not in line with the positive and loyal characters' personalities in the original work.
Well, there might be some very niche or non - canon fanfictions out there with such a plot, but it's not a common or widely - accepted idea in the Naruto fan community. Naruto and Hinata have a well - established relationship in the main series, and Neji is Hinata's cousin, which makes such a relationship in the context of cheating even more inappropriate and not in line with the general themes of the series.
There might be some fanfiction out there with such themes, but it's not in line with the healthy and positive representation of the Naruto characters. Sasuke and Hinata have their own established relationships in the canon, and creating such unethical scenarios in fanfiction is not a good practice.
One common theme could be exploring relationship breakdowns. It might show how Naruto reacts to such a betrayal, which can be a way to explore his character in a new light. Another theme could be the consequences for Hinata herself, like losing friends or facing social ostracism within the Naruto world's community.
You could look for fanfiction that focuses on their friendship or positive interactions within the Naruto universe. For example, stories about them teaming up for a mission or helping each other out in times of need.
One possible plotline could be that Naruto catches Hinata in a compromising situation that seems like cheating, but it's all a misunderstanding. Maybe she was helping a friend in secret and it looked bad. For example, she could be secretly training with another ninja to surprise Naruto with new skills, but he misinterprets it as something more inappropriate.
Honestly, I haven't come across a 'cheating Hinata' lemon fanfic. Fanfic writers usually explore a variety of themes, but the combination of 'cheating' and a 'lemon' (which implies sexual content) for a character like Hinata seems rather unappealing and not in line with the positive aspects of the character that most fans would like to see in fan works.