A plot idea could involve a time - travel fanfiction. Sasuke, Karin, and Sakura are sent back in time to when they were kids. Karin, who has always been on the outskirts, tries to befriend Sakura and Sasuke in this new timeline. Sakura, having the knowledge of what Karin was like in the future, is initially suspicious but then realizes Karin is just lonely. Meanwhile, Sasuke is oblivious to their complex relationship dynamics. This story could explore how their relationships might have been different if they had met under different circumstances.
One plot idea could be that Sasuke, Sakura and Karin are on a mission together. Along the way, they face a powerful enemy and have to rely on each other's skills. Sakura uses her medical ninjutsu to keep them all in good shape, Karin uses her sensing abilities to detect the enemy's movements, and Sasuke uses his combat skills to fight. Another could be a story where they have to solve a mystery in an ancient ninja village. They find old scrolls and artifacts that lead them on an adventure full of twists and turns.
A plot could be that Karin discovers a new chakra - related ability and Sasuke helps her master it. They train together and form a strong bond of friendship based on mutual respect for each other's skills.
One idea could be a story where Karin has to choose between her loyalty to Sasuke and her newfound friendship with Naruto. Maybe they are all on a mission together and face a powerful enemy that forces Karin to make this difficult decision.
How about a story where an unknown enemy creates clones of them? Naruto, Sasuke, and Sakura have to not only fight these clones but also figure out who the enemy is and why they are being targeted. Along the way, they might discover new powers within themselves and also learn more about their relationships with each other.
One plot idea could be that Sasuke is a vampire who has been secretly protecting Sakura from other dark forces in the vampire world. Another could be that Sakura discovers she has a special blood type that is very alluring to vampires, and Sasuke has to fight his instincts to protect her. Maybe they are both turned into vampires and have to navigate their new existence together.
One idea could be a highschool talent show where Sasuke is forced to participate by the school and Sakura helps him overcome his shyness about performing. Another could be a mystery in the highschool where Sasuke and Sakura team up to solve it, like a series of stolen textbooks. Or perhaps a sports competition where Sasuke is on the track team and Sakura is the team's medic, and they develop a deeper bond through the event.
One idea could be that Sasuke and Sakura are in the same college but in different majors. Sasuke is in a more solitary, academic major like theoretical physics, while Sakura is in pre - med. They meet in a general education class and initially clash because of their different personalities. But as they get paired for a group project, they start to understand each other more. Another plot could be that they are both part of a college sports team, say a martial arts club, and they compete for the top position in the club, which leads to a lot of tension and also a budding romance. A third idea is that they are in a college that has a mystery or a curse. Sasuke, with his natural inquisitiveness, and Sakura, with her determination, team up to solve the mystery, and during this process, their relationship deepens.
A possible plot is that the child is born with a unique power that neither Sasuke nor Sakura have. This power could attract the wrong kind of attention, and the child has to learn to control it while also hiding it from those who would misuse it. The story could also involve the child making friends with kids from different ninja clans and trying to bridge the gaps between the clans, just like their parents did in a way. Also, the child might have to deal with the pressure of being the heir to two very powerful ninja legacies.
Well, perhaps in the fanfiction, Sakura is a mermaid princess and Sasuke is a warrior from a nearby underwater kingdom. They meet during a battle between their kingdoms. Instead of fighting each other, they are intrigued by one another. Sakura's beauty and kindness make Sasuke question his loyalty to his own kingdom, and they start a secret relationship while trying to end the war between their people.
One idea could be exploring Sasuke's journey through puberty while dealing with his complex feelings for Sakura. Maybe his newfound hormonal changes make him more aware of his attraction to her, but he's conflicted because of his goals. Another could be Sakura noticing Sasuke's changes during puberty and it making her more determined to get closer to him, but she has to overcome her own insecurities.