I'm not familiar with such a specific fanfic, so I can't really tell you the plot.
Since it involves a rather specific and perhaps unappealing topic to many, it probably has a relatively small following. However, in some very specific fan communities that are into unique or out - of - the - ordinary scenarios, it could have some popularity.
I'm not really sure about specific 'sakura haruno diaper fanfic' stories as it's not a very common or mainstream type of fanfic. However, you could try searching on some well - known fanfic websites like Archive of Our Own or FanFiction.net and use those keywords to see if any relevant stories pop up.
In general, fanfiction that involves diapers in relation to a character like Sakura Haruno might not be considered appropriate in the context of the original Naruto series, which is mainly about ninja adventures, growth, and relationships. It can seem out of place and may not adhere to the spirit of the source material.
First, you need to have a clear idea of the plot. Since it's about Sakura Haruno, you could incorporate her character traits. For example, her determination could play a role in the story even if it involves a rather unusual diaper concept. Start with an outline of the beginning, middle, and end.
I'm not sure specifically about Sakura Haruno diaper fanfiction as it might be a rather niche and not so common type of fanfiction. However, you could try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. They have a vast collection of Naruto - related fanfictions, and you might find something related to Sakura Haruno in their search results.
The plot could involve Sakura Haruno finding herself in a parallel universe where she has to take on the identity of Catwoman. She may struggle at first to understand the new world she's in, but then use her intelligence and strong will, which are traits she has as a character from Naruto, to make a name for herself as a new kind of Catwoman. Maybe she forms an alliance with other superheroes or anti - heroes in this universe.
The fanfic could involve Sakura Haruno suddenly being whisked away from her normal life in Konoha. As a lost princess, she might have special powers that start to emerge. She could meet characters who help her on her journey, such as an old sage who knows about her past. And she'd have to deal with the politics and intrigue of the kingdom she once belonged to.
The plot might involve Sakura Haruno being betrayed by someone close and then sold to the mafia. Once in the hands of the mafia, she could be forced to do various tasks against her will, like spying on other clans or stealing valuable information. She might also try to find a way to escape while dealing with the dangerous and often immoral members of the mafia.
One possible plot could be Sakura Haruno trying to still carry on with her ninja duties while on her period. She might struggle a bit with the physical discomfort but still show her determination and strength. For example, she could be on a mission and have to hide her condition from her teammates to avoid being seen as weak.
The plot could center around Sakura's transformation into an Arrancar being a result of a powerful experiment gone wrong. As an Arrancar, she could discover new abilities she never had in the Naruto world, like the use of Cero. She would then have to deal with the other Arrancars, some of whom might see her as an intruder. And she would also have to figure out how her medical skills from the Naruto world could be applied in this new, more dangerous setting.