Perhaps Sakura leaves Konoha because she is disillusioned with the shinobi system. She may have witnessed some unjust practices and decides she can no longer be a part of it. In the fanfiction, this could lead to her becoming a rogue ninja. Sasuke, who has his own history with being a rogue, could either help her adapt to this new life or try to convince her to return to Konoha. The story could then focus on their relationship development in this new context.
Another plotline could be that Sakura leaves Konoha to find Sasuke and bring him back once and for all. However, on her journey, she faces many challenges that make her question her own strength and purpose. She might meet new allies and enemies. When she finally does find Sasuke, he could be in a situation that she never expected, like being held captive by a powerful new enemy. The fanfiction could then revolve around how they both escape and what it means for their relationship.
One possible plotline could be that Sakura leaves Konoha due to a personal quest for self - discovery. She might feel that she has outgrown the village or that there are things she can't achieve while staying there. For example, she could be in search of a new medical ninjutsu technique that can only be found in a far - off land. Along the way, Sasuke might cross her path, and they could either have a moment of reconciliation or further conflict depending on their respective states of mind.
Sasuke might initially be shocked. He has always seen Sakura as someone connected to Konoha, so her leaving would be unexpected. He could be concerned about her safety, especially if she leaves without proper preparation or protection.
One possible plotline could be Naruto leaving Konoha due to feeling out of place because of the harem situation. Maybe he's overwhelmed by the attention of multiple characters interested in him romantically and decides to seek solitude or a new path outside the village.
One possible plotline could be that they leave to seek a new form of power. Maybe they've discovered a threat that the Hidden Leaf isn't aware of, and they believe they can find a solution outside. Another could be that they're on a journey of self - discovery. Sakura has always been in Sasuke's shadow to some extent, and this could be her chance to truly find herself while being with him. Also, perhaps they leave due to some political unrest in Konoha that they don't want to be a part of.
A simple plot could be that Sakura gets pregnant and Sasuke is overjoyed. They start making plans for their future in Konoha. They look for a new house and start decorating a nursery. The whole village is happy for them.
A possible plotline could be that Sakura is from a secret organization against Konoha. She is sent as a spy, but as she lives in Konoha, she starts to question her loyalty and falls in love with the village and its people.
One possible plotline could be Sasuke and Sakura adjusting to the news. Sasuke might initially be shocked but then become overprotective. They could face challenges like dealing with the village's reactions. Maybe some people would be overjoyed while others might be skeptical. Another plotline could involve Sakura's pregnancy affecting her ninja duties. She might have to take a break, and Sasuke would step up more in their joint missions.
Love is a very common theme. The sakura leaves often symbolize the love between Sasuke and Sakura. For example, in many fanfictions, the characters might have a special moment under the sakura tree with the leaves falling around them, which represents the growth and beauty of their relationship.
One possibility is that Sakura leaves Konoha to seek stronger medical ninjutsu training elsewhere. Maybe she's heard of a hidden village with advanced medical techniques and decides to leave her home to master them. This could lead to her facing new challenges, making new friends, and coming back to Konoha as an even more powerful and knowledgeable medical ninja.
In terms of her character development, Sakura would likely become more of an anti - hero. She would be in a morally grey area. On one hand, she is with a group that is seen as villains by most of the ninja world. On the other hand, she might still have her own reasons for joining, like seeking power to protect something or someone. This new path could make her more independent and force her to rely on her own skills and judgment rather than depending on the support system she had in Konoha.
The Sakura leaves can symbolize the fleeting yet beautiful nature of Sasusaku's relationship. Just as the leaves fall and are reborn each season, their relationship could face hardships but also renewal.