She might change her piercings because she's bored with the old ones. It's natural to want something new after a while. Also, if she's into a new subculture or group that has a particular piercing style, she could be influenced to change. For instance, if she joins a punk - rock inspired community, she may get more edgy piercings.
One reason could be a change in personal style. As people grow and evolve, their fashion sense changes too. So, she might want to update her look with new piercings. Another reason is for a special occasion. For example, if she's going to a formal event, she may choose more elegant piercings.
A wife may also get a piercing as a form of celebration or milestone. Let's say she just achieved a big career goal or completed a difficult fitness journey. She might decide to mark that moment by getting a piercing. It could be a way to feel a sense of accomplishment and give herself a new look. And sometimes, it can be just for the fun of it. To try something new and exciting in her life and see how it makes her feel.
One reason could be a change in self - identity. Maybe she wants to break away from the traditional image society has of a 'wife' and express her individuality more freely.
She might want a new look. Maybe she was bored with her old appearance.
Perhaps as a sign of rebellion. If Naruto has some issues with the established norms in his village or with the ninja system in general in the fanfiction, getting piercings could be his way of defying authority and showing that he won't be restricted by the traditional ways.
In such a story, she might consider a belly button piercing, especially if she wants to show off a new sense of style, perhaps for a beach vacation or a new fitness regime. Another possibility is a lip piercing, which can give a very edgy look. Also, a tongue piercing could be part of her makeover, though it might be a bit more extreme and can have some challenges like affecting speech initially.
One reason could be for comical purposes. It can create a really funny situation that lightens the mood in the relationship. Just like in the story where the wife crossdresses as her husband to surprise him when he comes home.
Loneliness is a big factor. When the husband is away on military duties for a long time, the wife may feel extremely alone and seek company elsewhere.
She may feel guilty. The weight of her unfaithful act has been too much for her to bear, so she decides to confess.
In some cases, it might be due to the husband's laid - back nature. He may not be too bothered about who makes the decisions as long as things work out well. So the wife steps in and dominates. Also, in modern society, women are more empowered and may have stronger opinions on various matters like child - rearing, home decor, etc. So they tend to dominate in these areas. For example, the wife may have a very specific vision for how the house should be decorated and she takes charge of that.
It could be for the sake of relationship growth. By feminizing her husband in certain ways, like getting him interested in home - making or nurturing activities, it can create a more balanced partnership. They can share responsibilities more evenly and understand each other's roles better.