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 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.
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.
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.
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.
Well, I also know a fanfiction called 'Sakura Leaves in the Wind'. This story is more of an adventure - Sasuke and Sakura are on a journey, and the sakura leaves seem to follow them everywhere. It's full of action and of course, the underlying romance between the two. The description of the sakura leaves in different scenes adds a lot of charm to the story.
Perhaps Naruto leaves because he wants his child to grow up away from the pressures and expectations that come with being in Konoha. He might feel that the outside world can offer a more peaceful and normal upbringing for his family.
Sasuke might be more understanding. Given his own experiences of leaving Konoha, he could respect Naruto's decision. However, he might also secretly plan to keep an eye on Naruto from afar to make sure he is safe.
One popular 'Sasusaku Sakura Saves Konoha' fanfic might be 'The Rose's Resilience'. In this fic, Sakura uses her medical skills and newfound combat abilities to fend off a major threat to Konoha. Another could be 'Sakura's Redemption in Konoha', where she has to overcome past mistakes and prove herself as a true savior of the village. There's also 'Sakura's Konoha Defense', which focuses on her strategic planning to protect the village from a powerful enemy.
For Naruto, it would be a big shock. He's always seen Sakura as an important part of the team. He would probably feel guilty, thinking he might have done something wrong. Sasuke might be more reserved in his reaction, but deep down, he would also feel the loss. Kakashi would be worried about her safety. The other ninja in Konoha might start to question the unity of the village if someone like Sakura, who was so well - known, left. And the young ninja who looked up to Sakura would be disappointed and might even lose some motivation in their training.