One possible plot could be that they are in a dangerous situation together, like facing a powerful enemy. In the heat of the moment, they realize their feelings for each other and share a kiss. Another plot could be that Tsunade is injured and Kakashi, while taking care of her, they have a tender moment and kiss.
Yes, there might be some out there. You can check fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Kakashi and Tsunade kiss' on those platforms and you may find relevant stories.
One possible plotline could be that Sakura is injured during a difficult battle. Tsunade, as the experienced healer and mentor, tends to her. In the process, they share a moment of intense emotion and end up kissing as a sign of their deep bond. Another could be that they are celebrating a great victory for the village and in the euphoria of the moment, they kiss. Maybe it starts as a friendly peck but then turns into something more meaningful.
One possible plot could be that they accidentally end up in a situation where Sakura becomes pregnant, and then they have to deal with the reactions of their friends and the ninja community. Another could be that it's part of a planned future for them, and the fanfiction focuses on their preparations for the baby.
For Sakura, it could be a sign of her growing confidence and equality with Tsunade. If she initiates the kiss, it shows that she has come a long way from being a shy apprentice. She is now bold enough to express her feelings, whether it's a platonic deep love or something more complex. For Tsunade, it might make her more vulnerable. She has always been seen as a tough leader, but this moment could show that she has a soft side that she only shows to a select few, like Sakura.
A plot might involve Kakashi getting injured severely on a mission, and Sakura, in the process of taking care of him, realizes her true feelings for him. They then decide to get married. However, Kakashi's past traumas start to surface and affect their relationship. Sakura has to use her medical and emotional skills to help him through it. And in the end, they emerge stronger as a couple. There could also be a plot where an outside force tries to break them apart because they see their combined strength as a threat. But they fight against it and prove that their love is stronger.
A possible plot could revolve around Kakashi's team members' reactions to Naruto being his son. For example, Obito's spirit (if it has any influence) might have mixed feelings. And in the story, Naruto might inherit some of Kakashi's unique abilities in a more natural way than in the original series. The fanfiction could also explore how the Akatsuki views Naruto differently, knowing he is Kakashi's son, and how that affects their plans to capture the nine - tailed beast within him.
In some fanfictions, there might be a plot where Kakashi's past traumas are related to Naruto's current challenges. For instance, Kakashi's experience with losing his comrades could be used to help Naruto deal with the potential loss of his friends. Or perhaps a plot where Kakashi's family secrets are revealed and they have a significant impact on Naruto's growth as a ninja. This could involve a hidden jutsu or a prophecy that ties them together.
One possible plot could be that Kirby and Scarfy are on an adventure together, and during a particularly difficult moment, they rely on each other so much that it leads to a kiss. Another could be that they are at a festival in their world, and the festive atmosphere makes them share a spontaneous kiss.
One possible plot could be that cyd and naldo are in a situation where they are forced to hide their feelings for each other in public, but in a moment of privacy, they share a passionate kiss. Maybe they are in a world where their relationship is not accepted by society or their families, so the kiss is a secret expression of their love.
One scenario could be that they are in a life - or - death situation. Maybe they are surrounded by enemies and think they won't make it out alive. In that moment of desperation and realization of their unspoken feelings, they kiss. Another could be in a dream - like sequence where Kakashi has a vision of a different future with Sakura and they kiss in that vision.