A plotline might involve Sakura learning a new and dangerous medical jutsu from Tsunade. During the training, there are a lot of close calls and shared fears. As Sakura finally masters the jutsu, Tsunade is so proud that she impulsively kisses Sakura. Or perhaps in a parallel universe where the rules of the ninja world are different, Tsunade and Sakura are in a relationship, and the story could revolve around their daily lives and how they deal with the challenges of being in a relationship, with kisses being a natural part of their affectionate exchanges.
In some fanfiction, the plot could be set during a time of great unrest in the village. Tsunade and Sakura are working closely together to keep the village safe. As they face numerous threats and overcome them, their relationship deepens. There could be a moment when they think they might lose each other. In that moment of vulnerability, they kiss. It could also be that Sakura discovers a long - lost secret about Tsunade's past that makes her see Tsunade in a new light, leading to a kiss as a new aspect of their relationship begins to form.
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 plotline could be that they are in a dangerous situation together, and in a moment of relief after being saved, they share a spontaneous kiss. Another could be in an alternate universe where they are part of a different social structure and their relationship develops romantically over time, leading to a kiss. Maybe they are training together and a moment of intense emotion during training results in a kiss.
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 possible plotline could be a training arc. Tsunade could be training both Naruto and Sakura in a new and advanced form of combat or medical ninjutsu. This would involve a lot of character development as they struggle to master the new skills. For example, Naruto might have trouble with the precision required in a medical - related technique while Sakura helps him out, and Tsunade observes and gives tough love guidance.
A Tsunade - Sakura kiss in fanfiction could be a sign of a deep bond. It might represent a mentor - mentee relationship evolving into something more like a sisterly or mother - daughter - like affection. Maybe in the fanfic, Tsunade sees Sakura's growth and is proud, and the kiss is a way to show that.
A plotline could revolve around Sakura trying to understand Tsunade's past more deeply. Tsunade might be reluctant at first, but as they work together more closely, she starts to open up. This could lead to Sakura learning important life lessons from Tsunade's experiences, like how to deal with loss and keep going. They could also get into a situation where they have to use their combined medical and combat skills to save a group of injured ninjas.
Another plotline could involve Tsunade sharing her past experiences with Sakura. How she overcame difficulties in her early days as a ninja, her relationship with the previous Hokage, etc. This could inspire Sakura and lead to a deeper understanding between them. They could then use this new - found connection to better serve the Hidden Leaf Village, perhaps by coming up with new strategies for the village's defense or medical facilities improvement.
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.
One possible plotline could be that Naruto finally returns after a long and dangerous mission. Sakura, who has been worried sick, is so overjoyed to see him alive that she impulsively kisses him. Another could be in an alternate universe where Naruto and Sakura are forced to pretend to be a couple for a mission, and during the course of it, real feelings develop and they end up kissing.
One popular plotline is the 'what - if' scenario. For example, what if Naruto had realized his feelings for Sakura earlier? In this kind of fanfiction, Naruto might confess his love and then they share a kiss. Another is the 'danger - brings - them - closer' plot. Maybe they are in a life - threatening situation, and thinking they might not survive, they finally admit their feelings and kiss.
Well, one possible plotline could be that Tsunade gets into debt because of some bad gambling habits and then has to deal with the consequences. The 'lemon' part might involve some sort of romantic or steamy encounter as a result of her debt situation, perhaps with a character who helps her out but has certain demands. But this is just speculation as it's a very specific and rather unique concept for fanfiction.