A creative reason could be a magical prank gone too far. The Marauders or some other mischievous students play a prank on Snape using a new, untested spell. The spell backfires and Snape ends up in a state where he needs to be diapered. This would lead to a story of revenge, forgiveness, or just chaos at Hogwarts.
Perhaps it could be a story about a young Snape. His family situation was not great, and if he was ill or had some sort of accident as a young child, he had to be put in diapers. This could be a very emotional and in - depth look at his early life, his relationship with his parents, and how these early experiences influenced the man he became at Hogwarts.
Sometimes, physical disabilities or developmental delays can be the cause. Children with certain conditions may not have full control over their bladder function. Diapers can provide a sense of security and cleanliness for them. Also, if a child is in a situation where they can't access a toilet easily, like during a long car journey or a sports event, diapers might be used as a precautionary measure.
One possible reason could be for medical reasons. For example, if someone has a serious illness or injury that affects their bladder or bowel control, they might need to be put back into diapers. Another reason could be for comfort. Some people with certain disabilities might find diapers more comfortable and convenient. It could also be a part of a role - playing or regression therapy in some cases, where the person is exploring their past experiences or emotions in a safe and controlled way.
Some girls may have developmental delays in terms of potty - training. If a girl is not progressing as expected in learning to use the toilet independently, the daycare may put her back in diapers. This is not to shame the child but to ensure that she stays clean and comfortable while the daycare and parents work together to help her improve her skills. For example, some children with certain disabilities or learning difficulties may need more time and support in this area.
One reason could be that the girl has some medical issues like incontinence. For example, if she has a urinary tract infection or a problem with her bladder control muscles, her mom might put her back in diapers for a while to manage the situation. Another reason could be during a long journey where access to toilets is difficult and diapers can be a practical solution.
Isolation. Snape is a lonely character. He doesn't have many friends, and he is constantly in a difficult position between the Death Eaters and the Order of the Phoenix. His feeling of being alone and not being fully understood by anyone can lead to crying in fanfiction.
A main reason could be regression. If a child has achieved a certain level of potty - training success and then suddenly starts pooping their pants, it might be due to a change in their environment, like a new sibling or a move to a new house. This can cause stress, and being put back in diapers can help ease that stress while they adjust.
One reason could be to add a shock factor. It completely changes the expected family relations in the original story. Another reason might be to explore Snape's character more deeply. If Harry is his son, it gives a new perspective on Snape's actions and emotions towards Harry throughout the series.
Accidents during travel, as in Lily's case, can be a reason. Long trips without easy access to toilets can result in 'accidents'. Also, in some cases, if there is a lack of proper supervision or reminders during the potty - training phase, a child might need to go back to diapers for a short period to re - establish good habits.
Well, sometimes it could be because the daycare has a policy for dealing with children who are not fully adapted to using the toilet independently. If a girl is constantly having 'accidents' and it's becoming a hygiene issue or disrupting the normal routine at daycare, they may put her back in diapers. It could also be that the girl is simply not ready developmentally for potty training, despite what her parents might think. So, the daycare is just taking a practical step to ensure her comfort and the smooth running of the daycare environment.