First, you need to establish the relationship between Sasuke and Sakura. Are they already in a relationship or still in the pining stage? If they're in a relationship, you can create a situation where an outsider threatens their bond. For example, a new ninja arrives in the village who has a similar personality to Sasuke and shows interest in Sakura. Then, describe Sakura's reaction. Will she be flattered or immediately reject the new person? For Sasuke, show how he notices Sakura's reaction and how it makes him feel jealous. You can also include internal monologues for both characters to really delve into their emotions.
One great example could be a fanfic where Sakura gets jealous when a new female character shows interest in Sasuke. The writer might explore Sakura's insecurities and how she deals with her jealousy. Maybe she tries to prove herself more worthy of Sasuke's attention. Another example could be Sasuke getting jealous when he sees Sakura being too friendly with another male ninja. This could lead to some interesting confrontations and revelations about his true feelings for Sakura.
Sakura might directly confront her boyfriend. She could tell him that he has no reason to be jealous of Sasuke. For example, she could say that her feelings for her boyfriend are completely different from any admiration she has for Sasuke.
Well, Sasuke being jealous in this arranged marriage fanfic could lead to some intense moments. He could start training more vigorously to prove his worth to Sakura. Since he has a prideful nature, he wouldn't easily admit his jealousy. But his actions would speak louder. He might get into arguments with the elders who arranged the marriage if he feels they are not considering Sakura's feelings or his own connection with her.
One reason could be that Sasuke is very popular and has a lot of fangirls. In the fanfic, Sakura's boyfriend might feel insecure because Sasuke has this charm that attracts everyone. Maybe Sasuke is always achieving great things and getting a lot of attention, which makes the boyfriend jealous as he might feel he can't compete with Sasuke in terms of popularity and achievements.
A Sasuke Yandere x Sakura fanfic often explores a rather intense and possessive relationship. In such a fic, Sasuke's yandere traits would likely make him extremely protective of Sakura. He might go to great lengths to keep her all to himself, which could add a lot of drama to the story.
A lot of Sasuke x Sakura romance fanfic focuses on the emotional journey. There are the moments of jealousy, especially when other characters seem interested in either Sasuke or Sakura. The fanfics might also delve into how they communicate or rather struggle to communicate their feelings. Since Sasuke is not the most expressive, it creates a lot of tension and drama that makes the romance aspect more interesting. Some fanfics may also include flashbacks to their early days together in Team 7 to show how their relationship has evolved.
There's 'The Path to Redemption'. In this fanfic, Sasuke has to face the consequences of his past actions, and Sakura is there to support him. It's a well - written story that shows how their bond can grow stronger through hardships. It also has some interesting side characters that add depth to the plot.
Sasuke's jealousy can initially create turmoil. He may act out in ways that Sakura doesn't understand. This could cause friction between them. However, as they communicate more about his jealousy, it could lead to a deeper understanding. They might start to open up about their true feelings for each other. In the long run, this jealousy could be the catalyst that breaks down the barriers between them in the context of the arranged marriage.
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.