The curse mark can change their physical abilities. For Sasuke, it might enhance his speed and strength, but also make him more prone to losing control. Naruto, on the other hand, might develop new chakra - related powers because of his exposure to Sasuke's curse mark. For example, he could gain the ability to sense the curse mark's energy better.
Well, in many fanfictions, Sasuke's curse seal form often represents a more primal and uncontrollable side of him. So, it might make his actions towards Sakura more aggressive or unpredictable. He could be less rational and more driven by the power of the curse seal, which might lead to him restraining Sakura in a way that is more forceful than his normal self would be.
One theme that pops up often is protection. Sakura wants to protect Sasuke from the negative effects of the Curse Mark, while Sasuke, in some stories, tries to protect Sakura from himself when the Curse Mark takes over. Also, there's the theme of growth. Through their experiences with the Curse Mark situation, both characters grow. Sasuke learns to control the mark better, and Sakura becomes stronger in her resolve to be with him.
In some fanfictions, the curse mark can be a source of tension. If Sasuke's curse mark makes him more aggressive or unpredictable, Sakura might be worried about him. For example, he could accidentally lash out at her during a training session. This would put a strain on their relationship as she tries to help him and he tries to keep his distance to protect her from the curse mark's influence.
One great fanfiction could be where the curse mark on Sasuke or Sakura gives them unique powers that they have to learn to control. It might involve them training together to master these new abilities. For example, if Sakura has a curse mark that enhances her strength but also has a dark side, Sasuke could help her control it using his own experiences with the curse mark. This kind of fanfiction often explores their relationship in a deeper way, as they rely on each other more.
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 Maybe it makes him more withdrawn and Sakura has to find new ways to reach out to him.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.
One possibility could be that Sasuke is under a curse level 2 which affects his chakra flow. Sakura, being a skilled medical ninja, tries to find a cure. She has to face many challenges as the curse has some dark magic involved. Maybe she has to go on a journey to find rare herbs while also protecting Sasuke from those who want to use his cursed state for their own gain.
One interesting plot could be how the curse mark affects their relationship. Maybe Sasuke's curse mark starts to make him more aggressive towards Naruto, but Naruto is determined to save him from its dark influence. This could lead to some intense battles and emotional moments between them.
Their relationship could develop as Sakura becomes more protective of Sasuke due to the curse. Sasuke, in his vulnerable state, starts to see Sakura in a new light. He realizes how much she truly cares for him.
Obviously, Sakura and Sasuke are the main characters. Sakura is the one struggling, and Sasuke is the one whose grip is part of the situation, likely due to a curse.