Another theme might be the exploration of Sasuke's character growth. His jealousy could be a sign of his changing emotions and his journey towards becoming more in touch with his feelings for Sakura. It can also show his possessiveness in a way, which is a complex aspect of his personality. In some fanfics, this jealousy might lead to conflicts between him and other characters who are close to Sakura.
I'm not sure about specific 'Sasuke watches Sakura jealousy' fanfics off the top of my head. You could try searching on popular fanfic websites like Archive of Our Own or Fanfiction.net. Just use those keywords in the search bar and you might find some interesting ones.
In the fanfic, Sasuke's jealousy could manifest in different ways. He could be secretly spying on Sakura and her arranged partner, fuming with anger inside. Maybe he would start training more vigorously to distract himself from his jealousy, but it would still seep through in his interactions with Sakura. For example, when they accidentally meet, he might say something sarcastic about her arranged marriage. Meanwhile, Sakura could be conflicted between her duty in the arranged marriage and her growing awareness of Sasuke's feelings, which could be a central conflict driving the plot forward.
A fanfiction could involve a situation where both Sakura and Sasuke are dealing with jealousy in different ways. Sakura is jealous of the attention Sasuke gives to his ninja goals, while Sasuke is jealous of the friendships Sakura has with other guys. This creates a lot of tension and drama between them.
One possible plot could be that Sasuke sees Sakura getting close to another male character. He starts to feel jealous but doesn't know how to handle it. So he just watches her from afar, his eyes filled with a mix of envy and longing.
In many Sasuke - Hinata - Sakura fanfictions, Sakura's jealousy can be a complex and interesting aspect. It might stem from her long - held feelings for Sasuke. For example, if Hinata starts to get closer to Sasuke, Sakura could feel threatened. She might start to act out in ways that are out of character for her. Maybe she'll become more snippy or try to interfere in their relationship. Fanfiction writers often explore this dynamic to add drama and depth to the story.
One interesting aspect could be the development of Sasuke's emotions. In fanfic, when he watches Sakura, it might show a side of him that is more in touch with his feelings towards her. Maybe he starts to notice little things about her that he didn't before, like the way she takes care of others or her determination in difficult situations.
A possible plot development is that Sasuke challenges the man Sakura is arranged to marry to a duel. If he wins, he demands that the arranged marriage be called off. Another is that Sakura, seeing Sasuke's jealousy, starts to have second thoughts about the arranged marriage herself.
Well, the plot could be that Sasuke has been away on a long mission. When he comes back, he sees Sakura has become very close to Naruto in a different way. Sasuke starts to feel this twinge of jealousy because he realizes he might have lost his chance with Sakura. He then has to decide whether to confront his feelings or keep them buried.
If Sasuke watches Sakura kiss in a fanfic, his reaction could vary greatly. Given his stoic nature, he might try to hide his true feelings. However, deep down, he may feel a sense of betrayal even though it's just a fan - created story. It could also make him re - evaluate his own feelings for Sakura. Maybe he would start to realize that he has stronger feelings for her than he previously thought, or it could push him further away if he doesn't like what he sees.