Orochimaru could be interested in Sakura's chakra. The curse mark might be a way to manipulate or study her chakra in some way. Also, he might want to use her as a pawn against Naruto or Sasuke, knowing that Sakura is close to them.
Well, getting the curse mark could make Sakura more determined. She might see it as a challenge to overcome. It could also make her more isolated as others might fear her new mark. This could lead to her relying more on her own strength and less on the support of her friends.
I'm not sure specifically as there could be many different takes on it. But generally, it might involve Sakura getting a curse mark which could lead to her facing new challenges, perhaps having to deal with dark powers within her, and it could change her relationships with other characters as they might view her differently or she might have to struggle to control this new aspect of herself.
One possible consequence is that Naruto might face internal struggles. The curse mark has Orochimaru's taint, so Naruto could battle with the dark influence it brings. He might also face distrust from some in the village who fear he'll turn bad because of it.
It could be the result of a dark wizard's experiment gone wrong. Maybe some dark wizard was trying to create a new form of dark magic, and Harry accidentally got caught in the crossfire and ended up with the curse mark.
A sakura curse mark fanfiction might center around a group of characters who all have different types of curse marks, but the sakura one is unique. It could be that the sakura curse mark is the key to unlocking a hidden power within the group. For instance, when all their curse marks combine in a certain way during a dangerous situation, the sakura curse mark activates a shield that protects them all. Some fanfictions may also explore how the appearance of the sakura curse mark changes as the character grows stronger or more in tune with their powers, like it starts off as a small pink mark and then spreads into a beautiful sakura - like pattern across their body.
One potential consequence is that Naruto could lose control. The curse mark has dark powers, and if he can't master it, he might end up harming his friends or himself. Another consequence is that he could be ostracized by the village. People might fear the power he now has and see him as a threat, just like they did with Sasuke when he got Orochimaru's power.
She might gain new and unpredictable powers. The curse mark could potentially enhance her strength in combat, like giving her more chakra or new jutsu abilities. However, it could also come with a price, such as being influenced by dark forces.
One great fanfiction could be where Sasuke's Curse Mark affects his relationship with Sakura in unexpected ways. Maybe it makes him more withdrawn and Sakura has to find new ways to reach out to him. For example, she might study more about the Curse Mark's origin to better understand what he's going through.
Sakura is the central figure here. However, depending on the direction of the fanfiction, there could be new characters introduced. Maybe an old sage or a mysterious healer who claims to know about the curse mark. But the mainstay characters from the Naruto universe such as Kakashi Sensei could also be involved, guiding Sakura through this difficult time and helping her understand what the curse mark means and how to handle it.
The 'sakura gets the curse mark fanfic' might focus on how Sakura's relationships change. Her friends could be worried about her. She may have to seek out ways to remove the curse mark, which could lead her on an adventure to find a cure. Along the way, she might discover secrets about the origin of the curse mark and its connection to some greater power in her world.