Well, it could be that Naruto discovers some secrets about Konan's past that make him see her in a new light. He starts to protect her from those who would use her past against her. As they spend more time together, they realize they have strong feelings for each other. Their marriage then becomes a symbol of hope for a new era of peace between the different ninja factions in the Naruto world. This could involve political intrigue as some oppose their union while others see it as a chance for a better future.
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.
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.
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.
Yes, there are some. You can try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'naruto marries konan' in their search bars, and you'll likely find several stories to explore.
One possible plot twist could be that Konan discovers a hidden power within Naruto that he's not even aware of himself. This newfound power could attract the wrong kind of attention from other ninja villages or even from some secret organization. Another twist could be that Konan's past catches up with her in a way that endangers their marriage. Maybe an old enemy resurfaces and tries to use Konan to get to Naruto. Or perhaps there's a prophecy that says their union will bring either great destruction or great peace, and they have to figure out which it will be.
One possible plot twist could be that Konan discovers a hidden power within Naruto that even he doesn't know about. Maybe it's a connection to an ancient and forgotten jutsu. This could change the whole dynamic of their relationship and the way she saves him. For example, she might have to protect him not just from physical harm but also from those who would want to use this power for evil.
One possible plot could be that Nagato and Konan, having had a change of heart after their past experiences, sense a great danger approaching Naruto. They use their unique abilities to fend off the enemies. Nagato with his Rinnegan powers could manipulate gravity and repel powerful attacks, while Konan, with her origami - like jutsu, creates barriers and distractions. Maybe they are trying to make up for their past wrongs by saving Naruto, who represents a new hope for the ninja world.
In a 'Naruto and Konan high school fanfiction', perhaps there's a high school where different ninja clans send their kids. Naruto, being from the Uzumaki clan, and Konan from the Akatsuki group's affiliated something (in this high school AU). There could be a school dance where Naruto asks Konan to be his partner and they start to see each other in a new light.
One common theme is the merging of two different worlds. Naruto is from a more optimistic and large - scale ninja village, while Konan has her roots in the darker, more secretive Amegakure. Their marriage often symbolizes the bringing together of these two aspects.
One possible plot could be that Naruto and Fuu meet during a mission. Fuu is initially intrigued by Naruto's determination. As they spend more time together, they discover they share a similar sense of humor. Eventually, Naruto realizes his feelings for Fuu are more than just friendship and he proposes. Their wedding would be a grand affair, with all of Naruto's friends from Konoha attending.
One possible plot could be that Haku survives her encounter with Naruto and his friends. As they continue on their journeys, they keep crossing paths and gradually develop feelings for each other. Eventually, they decide to get married to bring peace between their respective clans or groups.