It might change her relationship with Ron. He could be initially shocked but then grow to like the new look, seeing it as a sign of Hermione's independence. Or it could cause some tension if he preferred her old look.
One possible reason could be a symbol of a new beginning. Maybe she's had a major life change, like starting a new chapter in her relationship or in her studies at Hogwarts. It could also be a sign of rebellion against the traditional image others have of her. In some fanfictions, she might cut her hair to fit in with a different group or to show that she's breaking free from her old self.
It could be a story of self-transformation and finding new love. Maybe the girl cutting her hair symbolizes a fresh start and catches the attention of a special someone.
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.
One way to depict it is that her parents are overprotective. They worry about her getting hurt during ninja training. But Sakura is determined to prove to them that she can take care of herself. This creates some tension in the family but also shows her strong - willed nature from a young age.
There could be the patients, of course. Each patient might have their own unique backstory and personality. Maybe there's a young patient who is dealing with trauma, and Sakura has to find a way to reach out to them.
One possible fanfiction could be about Sakura Haruno encountering a mysterious monster in the forest. Maybe the monster is initially seen as a threat, but as the story progresses, Sakura discovers that the monster has a tragic past that led it to become what it is. She then tries to help the monster find peace and redemption.
I'm not sure if there is a specific 'sakura haruno seduce fanfic' readily available. You could try searching on fanfic platforms like FanFiction.net or Archive of Our Own, but keep in mind that the content should be appropriate and in line with the platform's rules.
One great 'sakura haruno fanfiction' is 'A New Beginning for Sakura'. It shows Sakura in a different light, with her exploring new jutsu and relationships outside of the main Naruto storyline.