Well, it could be that Sasuke is kidnapped by a group who wants to force him to join their side. They might believe that with Sasuke's power, they can take over the ninja world. Kakashi, being Sasuke's former teacher, feels a strong sense of responsibility. He first tries to gather intelligence on the kidnappers' location. Once he has an idea, he sets out alone, relying on his stealth and combat skills. Along the way, he might face some moral dilemmas, like whether to sacrifice the safety of some innocents in order to save Sasuke quickly.
In a fanfiction, Sasuke could be kidnapped by a mysterious organization that is interested in his unique genetic makeup as an Uchiha. Kakashi would immediately start his investigation. He'd recall Sasuke's past enemies and possible motives. He might discover that the kidnappers are planning to extract Sasuke's chakra or use his body for some sort of experiment. Kakashi would then have to infiltrate their hideout, which could be filled with dangerous jutsu - based security measures.
A plotline where Sasuke and Kakashi are forced to team up against a new and powerful enemy that neither of them can face alone. They have to put aside their differences and combine their unique skills. For instance, Sasuke's Sharingan and Kakashi's Sharingan - related techniques could be combined in a creative way to defeat the foe. This would involve a lot of strategizing and character development as they learn to trust each other more.
One way could be through words of wisdom. Kakashi has a lot of life experience and could share his insights with Sasuke, like how to deal with his inner turmoil and the path he should choose. For example, he might tell Sasuke that revenge isn't always the answer and that there are other ways to find peace.
Kakashi would be deeply concerned. Given his relationship with Sasuke, he'd feel a strong sense of duty to save him. He'd use his extensive network of contacts within the ninja world to try and find out where Sasuke has been taken. He might also reflect on his past training with Sasuke and how he can use that knowledge to anticipate the kidnappers' moves. He'd be ready to face any danger or obstacle in his path to rescue Sasuke. And he'd be constantly thinking about Sasuke's safety and well - being during the whole process.
There could potentially be some really creative and out - of - the - box fanfictions with this concept. But finding one might be a challenge. You could try searching on specialized fanfiction websites and use specific search terms like 'Kakashi Sasuke non - traditional relationship fanfiction' and then look through the results to see if there are any that involve the idea of Sasuke being pregnant. But remember, this is a very unusual concept even for fanfiction.
Perhaps there's a mission where Kakashi and Sasuke are on opposite sides. Kakashi is following the orders of the village, and Sasuke is following his own path for revenge. In a confrontation, Kakashi uses his Sharingan - based techniques against Sasuke. Sasuke, not fully prepared to face Kakashi at that level, gets hurt. This would add more complexity to their relationship as teacher and student.
One possible plotline could be Kakashi teaching them unique ninja skills. Since he has his own set of diverse abilities, he could pass on some of his more unorthodox techniques to Naruto, Sasuke, and Sakura. For example, he might teach Naruto a more refined version of the Rasengan, or help Sasuke better control his Sharingan powers. And for Sakura, he could train her in some of his stealth and assassination techniques, which would add a new dimension to her combat skills. Another plotline could involve Kakashi helping them deal with their personal issues. He could be a mentor figure for Naruto in understanding his loneliness and the importance of his role as a Jinchuriki. For Sasuke, Kakashi could play a key role in his journey to avenge his clan while also guiding him to not be consumed by hatred. And for Sakura, he could assist her in growing more confident in her abilities and not being overshadowed by her teammates.
One possible fanfic could start with Sakura out on a solo mission in a forest. Sasuke, who has been misled by some dark force, sees this as an opportunity to get Sakura for some unknown reason. He uses his ninja skills to quickly subdue her and takes her to a hidden cave. Sakura is shocked and tries to reason with him, but Sasuke seems to be in a trance. Meanwhile, Naruto and the others start to search for her when they realize she's missing.
One possible plotline could be Sasuke discovers he's pregnant while on a solo mission. He then has to figure out how to deal with this situation while also hiding it from his enemies. Another could be that it's the result of some sort of magic or experimental jutsu gone wrong. He then has to face the reactions of his friends and family, especially Naruto, who might be shocked but also supportive.
A plotline could be that there is a powerful new enemy that specifically targets their bonds. This enemy uses illusions and mind - control to try and turn Sasuke against Naruto, or make Sakura distrust Kakashi. They have to fight not only the physical attacks of this enemy but also the mental and emotional turmoil it causes within their group. In the end, they realize the true strength of their relationships and are able to defeat the enemy.
One interesting plotline could be Kakashi struggling to control the new power. Since the Rinnegan is extremely powerful, he might initially have a hard time adjusting. For instance, he accidentally activates its powers during a simple sparring session and causes a huge commotion. Another plotline could be how the other ninja react to Kakashi having the Rinnegan. Some might be jealous, some might be afraid, and some might see it as a new hope for the village.