Maybe you got bored with the novel in the workbook. Sometimes the plot or the writing style just doesn't hold your interest anymore.
Think about why you put it down in the first place. If it was because it was boring, try to look at it from a different perspective. Maybe skim through the next few pages to see if the plot picks up. If it was due to distractions, remove those distractions and set a specific time to read, like 15 - 20 minutes just focused on the workbook novel.
One reason could be a physical illness. For example, if someone has a severe urinary tract infection that affects their ability to control their bladder, they might be put back in diapers.
One possible reason could be that she wants to feel confident and attractive for herself. Sometimes, wearing something sexy can boost a woman's self - esteem.
Perhaps the mom is trying to teach him about gender equality. By putting him in dresses, she's showing that clothing doesn't have a gender and that he should be open - minded about different ways of dressing. She might be influenced by modern ideas of breaking down gender barriers in all aspects of life including fashion.
One possible reason could be that he's being held captive by an enemy who sees him as a threat. Maybe a powerful villain has managed to overpower Naruto and locked him in a cage to prevent him from interfering with their evil plans.
One reason could be the saturation of the market. There are so many Naruto fanfictions out there that it's hard for new ones to stand out. Another factor might be the decline in the overall popularity of the Naruto franchise over time, leading to less interest in its fan - created content.
She might be tired. After a long day of doing housework, taking care of kids or working outside, sitting down is a way to rest her weary body.
One reason could be a medical issue. For example, if someone has bladder or bowel control problems due to an illness or injury. Another reason might be for comfort. Some people with certain disabilities find diapers more comfortable and convenient. It could also be part of a role - playing or fetish thing in some very specific and consensual adult scenarios, but we'll assume a more general non - adult context here.
One reason could be that the girl has started wetting the bed again. This might be due to stress, such as problems at school or with friends.
One possible reason could be that he's framed for a crime he didn't commit. Maybe someone powerful wants to get rid of him and plants false evidence. For example, they could make it seem like he attacked a village ally when in fact he was defending it from a hidden enemy.