A plotline could revolve around a love potion or some sort of magical spell. For instance, someone casts a spell on Naruto that makes him fall in love with Naruko, and the kiss is a result of that. But then, as the story progresses, they actually start to develop real feelings for each other. It could be a story of how they deal with these new - found emotions and the consequences of the initial spell.
Another plotline might be a parallel universe type of story. In this alternate world, Naruto and Naruko are from different clans that have a long - standing feud. But they meet secretly and fall in love. The kiss could be a moment of defiance against their families' wishes and the start of a journey to end the feud and be together. This would involve a lot of drama, action, and of course, the development of their relationship.
One possible plotline could be that Ryuuzetsu is on a mission and Naruto accidentally stumbles upon her. They initially have a misunderstanding but as they get to know each other better, feelings develop and lead to a kiss. Another could be that Ryuuzetsu is somehow related to a new threat in the Naruto world and Naruto has to work with her. During their time together, they find a connection and share a kiss. Maybe Ryuuzetsu has some unique power that Naruto needs to understand, and in the process of that discovery, they grow closer and kiss.
One possible plotline could be that Ino and Naruto are on a mission together. They get separated from the rest of the team and have to rely on each other. In the process, they grow closer and share a kiss as a sign of their new - found connection.
One possible plotline could be a situation where Naruto is split into two versions of himself, maybe by some sort of jutsu gone wrong. And as they get to know each other better, they end up kissing as a way to reunite or merge back into one. Another could be in a dream sequence where Naruto is exploring his self - worth and in this dream, he kisses his own reflection which then turns into another version of himself.
One possible plotline could be that Naruto and Ahsoka are somehow transported to a parallel dimension where they have to team up to face a common enemy. During their adventures, they develop feelings for each other and eventually share a kiss. Another could be that Ahsoka visits the Naruto universe and Naruto is assigned to be her guide. They bond over their shared experiences of being strong - willed fighters and that leads to a romantic moment.
One possible plotline could be that Naruto and Ino are on a mission together. They face many challenges and during a particularly tough moment, Ino gets injured. Naruto is worried sick and when she recovers, he impulsively kisses her out of relief and new - found feelings. Another plotline could be that Ino has always had a secret crush on Naruto, but he was oblivious. As they grow older and Naruto starts to notice Ino in a new light, they share a kiss at a village festival.
A possible plotline could be a time - travel story. Naruko and Yugito could be sent back in time and have to use their knowledge of the future to prevent a great disaster from happening in the past. They might meet younger versions of important characters and have to convince them to change certain actions.
One possible plotline could be that there is some sort of magical or dimensional rift that brings Naruto and Annabeth together. They initially misunderstand each other but as they start to work together to find a way back to their respective worlds, they develop feelings and end up kissing. Another could be that they are both summoned by a powerful being who forces them to compete in a series of challenges, during which they get to know each other better and share a kiss. Maybe there's a situation where Naruto's ninja skills and Annabeth's strategic thinking are needed to save a combined world, and their relationship blossoms from there.
One possible plotline could be that Cece and Gunther are friends who have secretly had feelings for each other for a long time. A series of events, like working together on a project or helping each other through a tough time, could lead to a moment where they finally kiss.
One possible plotline could be that they are in a dangerous situation together, and in a moment of relief after surviving, they share a kiss. For example, after fighting a particularly tough Akuma, the adrenaline and the realization that they care deeply for each other leads to that kiss.
Another plotline could involve a misunderstanding. Let's say there's a party or an event, and in the heat of the moment, they kiss. But then one of them thinks it was just a friendly gesture while the other has deeper feelings. This could lead to a series of comical or emotional events as they try to figure out what the kiss really meant. There could be miscommunications, jealousy, and eventually, a resolution where they both admit their true feelings.