Love and affection are very common themes. Since their relationship in the original story had its ups and downs, in fluff fanfiction, it's all about showing their deep love for each other. For example, Sasuke doing small things like bringing Sakura her favorite flower just to see her smile.
Another common theme is domesticity. Writers often like to explore what their life would be like if they were a normal couple. So, there could be scenes of them cooking together or just relaxing at home, with Sasuke being more open and warm towards Sakura. It gives a sense of a peaceful, loving relationship that fans adore.
Overcoming past traumas together is also a theme. Both Sasuke and Sakura have had difficult pasts. In fluff fanfiction, they support each other through those memories. For instance, Sasuke sharing his feelings about his clan's massacre with Sakura, and she comforts him, strengthening their bond in the process.
Love and redemption are very common themes. Since Sasuke has a rather troubled past, many fanfictions explore how he can find redemption through his relationship with Sakura, who loves him unconditionally.
Common themes include the power of love. Sakura's love for Sasuke is so strong that it can break through his cold exterior. There are also themes related to forgiveness. Sasuke has made mistakes in the past, and Sakura has to forgive him. And in many fanfictions, the theme of building a future together is prominent, whether it's rebuilding the Uchiha clan or just living a happy life in the village.
One heartwarming moment could be when Sasuke finally shows his true feelings for Sakura. After years of him being distant, he might give her a small, sincere smile that is just for her. It would be a moment that Sakura has been waiting for, and it would show that Sasuke has truly let her into his heart.
One common theme is Sasuke's struggle to admit his feelings. When he's jealous, it shows that he actually cares more about Sakura than he lets on. Another theme could be misunderstandings. He might misinterpret Sakura's interactions with others as something more than friendship.
Love and redemption are common themes. Sasuke often has a lot to make up for in his relationship with Sakura, and the fanfictions explore how he tries to earn her forgiveness and love. For example, in some stories, he goes on dangerous missions to prove his worth to her.
Love and commitment are common themes. These fanfictions often explore how Sakura and Sasuke, who have a complex history, come to fully commit to each other in marriage. For instance, they might show how Sasuke overcomes his past traumas to be a loving husband.
Love and friendship are also big themes. Their relationship can start as friends or comrades and then develop into something more romantic. Fanfictions might explore how they overcome the barriers between them, like Sasuke's brooding nature or Sakura's insecurities.
A frequent theme is family. In these fanfictions, they often start a family together. There could be stories about how they raise their children, passing on their ninja skills and values. It's also common to see the theme of acceptance. The village accepts their relationship fully, and they become an example of a loving couple. Also, the exploration of their love story, how it developed from Sasuke's initial indifference to Sakura to deep love, is a common theme.
Love triangle is a very common theme. The complex relationship between Naruto, Sakura, and Sasuke, with Sakura's initial love for Sasuke and Naruto's unrequited love for Sakura, often forms the basis of many fanfictions. It creates a lot of drama and emotional tension.
One common theme is the rekindling of their relationship. At the party, they often have moments that bring them closer after all the hardships they've been through. Another theme is friendship, as their friends are usually part of the party too, and it shows how their relationships with others also impact their relationship with each other.