One good example could be a story where Sasuke is getting a lot of attention from a new female character in the village. Sakura becomes jealous seeing them interact so often. In the fanfiction, Sakura might start to distance herself from Sasuke, which makes Sasuke wonder what's wrong. Eventually, he realizes it's because of his interactions with the other girl and has to work to regain Sakura's trust.
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.
A great fanfiction idea is that Sasuke is jealous when Sakura is chosen to go on a mission with a group of other ninjas, and he's not included. He secretly follows them and ends up saving the group from a dangerous situation. Sakura realizes that Sasuke's jealousy was actually his way of showing he cares about her, and this event brings them closer together.
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.
One good example could be a fanfic where Naruto accidentally spends more time with Ino during a mission, and Sakura gets jealous. In the story, Sakura might start to question her own feelings for Naruto. Another example could be a fanfic where Ino flirts with Naruto to make Sai jealous, but it backfires and makes Sakura jealous instead. There are also fanfics where Naruto has to choose between Ino and Sakura, and the jealousy of the unchosen one drives the plot.
A possible fanfiction could have Sakura and Gaara in a situation where they are part of a joint mission with other ninjas. There's a new male ninja on the team who is overly friendly with Sakura. Gaara notices Sakura blushing at the new guy's compliments. Gaara becomes jealous and starts to act more distant towards Sakura. Sakura, not understanding why, gets jealous herself when she sees Gaara spending time with another female ninja from the village who seems to be very interested in him. This creates a cycle of jealousy and misunderstandings between them.
One great example could be a story where Sasuke is a vampire who has been living in solitude for centuries. Sakura, a healer in her village, stumbles upon him injured one day. Their initial encounter is filled with mistrust, but as time passes, they start to fall in love. The fanfiction could explore how their relationship develops against the backdrop of the vampire world's rules and Sakura's human life.
One example could be when another character shows too much interest in Sakura. Sasuke might become jealous. For instance, if a new ninja in the village starts flirting with Sakura, Sasuke would feel a twinge of jealousy. He might not show it outwardly at first, but his actions would change. He could start being more protective of Sakura, like walking her home more often or making sure he's around when that other character is there.
In some fanfictions, Sakura becomes very successful in her medical ninja skills and many guys start to admire her. One of them is very bold and openly courts her. Sasuke, who has always taken Sakura for granted, suddenly feels jealous. He then has to figure out his true feelings for Sakura and how to deal with this new - found jealousy.
The plot could start with Sakura getting a lot of attention from other ninjas because of her new medical jutsu. Sasuke, who has always been reserved about his feelings for her, starts to feel jealous. One day, he sees her being praised by a group of ninjas and he can't take it anymore. He pulls her aside and gives her a sudden, jealous kiss. This kiss could be the turning point in their relationship, making them finally admit their feelings for each other.
One example could be a story where Sasuke gets extremely protective when other guys show interest in Sakura. He might glare at them or subtly put himself between Sakura and the potential suitors. In some fanfictions, Sasuke's possessiveness could lead to him being more open about his feelings for Sakura, like giving her special gifts or spending more time with her than he usually would.