Well, some fanfictions might center around Sasuke and Sakura's relationship evolution after a long time. It could start with Sasuke's return and how Sakura, who has become a more confident and skilled kunoichi, reacts to him. There could be a plot where they go on a journey together to help the village in some way, and during this journey, they have long conversations about their past, present, and future. Their relationship could gradually shift from just comrades to something more, as they rediscover each other after being separated for a significant amount of time.
There could be a fanfiction where Sasuke and Sakura meet 'been so long' and they start to train together again like in their younger days. This could bring back memories and they might start to see each other in a new light. It could also be a story where they are forced to confront their past feelings during a time of crisis in the village, after being apart for so long. Maybe they realize that they still care deeply for each other in ways they didn't expect.