Perhaps it's a story where girls are sent back to a younger age mentally and physically, and being in diapers is just one aspect of the regression. It could explore how they adapt to this new state of being and the challenges they face.
It could be about girls who for some reason, like a magical event or a strange experiment, find themselves back in diapers. Maybe they have to relearn basic skills while in this situation.
One possible story could be about a girl who has a medical condition that causes her to need to go back to wearing diapers temporarily. For example, she might have had an accident or an illness that affected her bladder control. Her family and friends would then need to support her during this difficult time.
Maybe it's a story about a girl who has to go back to wearing diapers due to a medical condition. For example, she might have an illness that affects her bladder control, like a urinary tract infection that is difficult to treat immediately, so she has to rely on diapers temporarily.
Well, it could be a story where the Equestria Girls are magically turned into babies and have to wear diapers. They then go on a journey to find a way to reverse the spell while dealing with the challenges of being in a baby state, like learning to crawl and communicate in a more basic way.
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.
Maybe she has some medical issues like incontinence. For example, a urinary tract infection could cause problems with bladder control.
One reason could be for medical issues. For example, if she has a bladder or bowel problem that makes it difficult to control her functions. Another possibility is psychological stress. Maybe she's going through a tough time and unconsciously reverts to a more infantile state for comfort. It could also be part of a role - playing or regression therapy in some cases.
Medical reasons could be one cause. For example, if a girl has a bladder or bowel control issue due to an illness or an injury, being in diapers full - time might be necessary.
One possible theme could be regression. It might explore the idea of going back to a more innocent or dependent state, like infancy when diapers are used.
Well, perhaps in the 'girls in diapers at wedding story', it might be related to family circumstances. There could be a large age gap in the family, and the younger girls in diapers are part of the family celebration. They could be seen as a sign of the future of the family that is being formed through the wedding. It's like they are the new generation that will grow up within the family created by the marriage.
One possible reason could be for medical reasons. Maybe the girl has some medical issues that require her to use diapers again, like bladder control problems. Another reason could be part of a prank in a fictional story, where friends play a mean joke on her. However, this kind of prank is not acceptable in real life.