Well, it could be due to a disruption in the chakra control. If the character who performed the female henge loses focus or gets distracted, the chakra maintaining the transformation might falter and cause the henge to disappear. For example, if they are suddenly attacked or startled during the henge.
One possible reason could be for stealth. By using a female henge, Naruto might be trying to blend into a group where females are less likely to be suspected. For example, if he's infiltrating an enemy base that is more vigilant against male intruders.
One possible plot could be that Naruto accidentally uses a new type of henge that makes him disappear not just visually but also from the ninja world's chakra detection. His friends then go on a quest to find him. They might face various challenges and encounter old enemies who are taking advantage of Naruto's disappearance. In the end, they find a way to reverse the henge and bring Naruto back.
His enemies could be thrown off - guard. If they are looking for Naruto, a male ninja, they won't expect him to be in a female form and disappear. This could give Naruto an advantage in future encounters as his enemies will be more cautious and less certain about his whereabouts. The female henge might also make some of his enemies underestimate him, thinking it's just a random girl and not realizing it's Naruto until it's too late.
His friends would be in shock. Kakashi would take charge of the situation. He would gather all the information about what Naruto was doing before he disappeared. Naruto's friends like Choji and Ino would use their respective skills to help in the search. Ino could try to use her mind - reading jutsu on people who were around Naruto before he disappeared. They would all be determined to find Naruto because he is an important part of their team and the village.
In general, fanfiction that involves characters sneaking into a female bathhouse through transformation (henge) is inappropriate and goes against the respectful portrayal of characters. It often objectifies female characters and violates the boundaries of proper storytelling.
In a fanfiction, the female henge into a bikini - clad character might lead to some interesting character development. For example, Naruto could learn more about how female characters are perceived in the ninja world. His friends' reactions, like Sasuke being a bit flustered or Sakura being jealous of the 'new girl', could add depth to the story.
A simple story could be that Naruto accidentally uses the female henge in front of his friends while wearing a bikini - like getup. His friends are shocked at first but then burst into laughter. It could be a light - hearted, one - shot fanfiction.
One possible fanfiction idea could be Naruto using his henge technique to transform into someone wearing a really cool swimsuit. Maybe he does it for a mission at a beach resort where he has to blend in with the tourists. He could transform into a famous surfer and use his skills to gather information.
No. Creating or promoting fanfiction involving inappropriate scenarios in a bathhouse is unethical. It objectifies characters and goes against the respectful treatment of the Naruto franchise and its characters.