In this fanfiction, it could be that a prophecy foretold of a child born from Naruto and Konan that would bring great change. So, they are brought together by fate. Konan's pregnancy then becomes a journey of hope and fear. The Akatsuki may try to interfere as they have their own agendas regarding such a powerful union. Naruto, on the other hand, would call upon his friends for help and protection, leading to some interesting alliances and battles.
One possible plot could be that they accidentally get caught in a jutsu that causes Konan to become pregnant. Naruto, being the responsible person he is, decides to support her fully. They might face challenges from their respective villages as their relationship was unexpected. Konan may have to deal with the physical and emotional changes during pregnancy while Naruto tries to protect her from any harm.
One possible plot could be that they meet at a young age during a shinobi training event. Since they are the same age, they might form a friendly rivalry. They could compete in various skills like ninjutsu or stealth. As they grow up, this rivalry might turn into a deep respect for each other's abilities.
One possible plot could be that it's an alternate universe where Naruto and Tenten end up together in a situation that leads to pregnancy. Maybe they were on a mission together and some strange magic or jutsu affected them, causing Tenten to become pregnant. They then have to deal with the reactions of their friends and the challenges of impending parenthood.
The plot could be that Naruto and Mei are in a secret relationship. When Mei gets pregnant, they try to keep it a secret at first. However, as the pregnancy progresses, it becomes harder to hide. Mei starts to show signs of a special chakra within her womb, which makes some villains target her. Naruto has to fight off these villains while also dealing with his own insecurities about becoming a father. They finally decide to reveal their relationship and Mei's pregnancy to their closest friends and allies, who then rally around them to protect them and the unborn child.
One possible plot could be that Naruto and Cana are from different worlds that somehow collide. They meet and fall in love. When Cana discovers she is pregnant, they face challenges from their respective communities. Naruto's ninja world might be against the union due to Cana being from a different realm, and Cana's side might have issues with Naruto's ninja lifestyle.
One possible plot could be that Naruto and Shion's relationship develops gradually. Shion discovers she's pregnant and they face challenges together. For example, they might have to deal with the reactions of their friends and the village. Naruto would be protective, using his skills to keep Shion and the unborn child safe from any threats.
Perhaps in this fanfiction, an evil force has a plan that involves Azula getting pregnant with Naruto's child. The two initially don't get along but as the pregnancy progresses, they start to understand each other better. Naruto teaches Azula about his ninja values like friendship and hard work, while Azula shows Naruto some of the strategic skills from her world. And they work together to protect their unborn child from the evil force.
Another plot twist might be in Naruto's relationships. With Konan as his caregiver, he could have a different dynamic with the other Akatsuki members. For example, he might form an unexpected bond with Pain. Konan could act as a mediator between Naruto and Pain, leading to a situation where Naruto tries to understand Pain's ideology from a different perspective.
A plot could revolve around a prophecy that only Naruto and Konan together can fulfill. As they search for the meaning of the prophecy and how to complete it, they grow closer. The kiss might occur when they finally understand the true nature of the prophecy and their role in it. It could also be that there is a dark force trying to prevent them from fulfilling the prophecy, and their love, shown through the kiss, gives them the strength to overcome this obstacle.
A plot could involve Konan being sent on a mission to Konoha. There, she meets Naruto again (after previous encounters during the war). They start to exchange ideas about peace and how to achieve it in their respective villages. This interaction leads to a friendship that blossoms into love, and they decide to get married, uniting their villages in a new way.
In a 'Naruto son of Konan' fanfiction, perhaps Naruto's connection to Konan is kept a secret for a long time. But as he grows older, certain events start to unfold that make him suspect. For example, he might have an uncanny ability with paper, like Konan did. And when he finally finds out, he has to deal with the shock and also the implications it has on his relationships with his friends and the village.