Well, it could be a way to show Tsunade's affection for Sakura in a very direct way. Maybe Tsunade has watched Sakura grow and develop, and the kiss is like a seal of approval. It's a way of saying that she's proud of Sakura.
In some fanfics, it might be a completely different take. It could be a moment of comfort. Sakura might be going through a tough time, and Tsunade, as a more experienced and motherly figure, gives her a kiss to console her. It adds a layer of emotional depth to their relationship.
Perhaps in a fanfiction, it could be a part of a bet. Tsunade, always the confident one, makes a bet with Sakura. If Sakura can master a really difficult medical jutsu within a short time, Tsunade will give her a special reward. Sakura manages to do it, and Tsunade, impressed and proud, gives her a congratulatory kiss. This would add an interesting dynamic to their relationship in the story.
Sakura Tsunade fanfics can be really interesting. They often explore the relationship between Sakura and Tsunade in different ways. Some might focus on Tsunade training Sakura, showing how Sakura grows under her guidance. It could also delve into their shared experiences as strong female characters in the Naruto universe.
One great Tsunade and Sakura fanfic I read focused on their mentor - mentee relationship. It showed how Tsunade passed on her medical ninjutsu skills to Sakura. The fanfic also added some interesting side stories about their adventures together in the Hidden Leaf Village.
It could symbolize protection. Naruto is a strong character, and by kissing Sakura's forehead, he's sort of pledging to keep her safe. It's like a knight protecting his lady in a way, but in the Naruto universe context.
One great Sakura Tsunade fanfic is 'The Healer's Legacy'. It shows how Tsunade trains Sakura to be an even better medical ninja. Another is 'Sakura's Mentor', which focuses on their day - to - day interactions during Sakura's training. 'Tsunade's Apprentice' is also worth reading as it delves deep into Sakura's growth under Tsunade's wing.
I would recommend 'Tsunade's Legacy: Sakura's Growth'. It beautifully portrays how Sakura evolves under Tsunade's guidance. It has great action scenes and also some heart - warming moments between the two.
Yes, it can be a somewhat common theme. In the Naruto series, both Tsunade and Sakura are strong female characters. Some fans might be interested in exploring a relationship between them in fanfiction, including a romantic or affectionate moment like a kiss. It allows fans to delve deeper into the characters' potential relationships that may not be explored in the original series.
One possible plot could be that Naruto, in a moment of extreme emotion and gratitude towards Tsunade, impulsively kisses her. Tsunade, initially shocked, might then realize Naruto's growth and the depth of his feelings not just for her as a leader but as a person. This could lead to a series of events where Tsunade starts to see Naruto in a new light, perhaps as a more mature and complex individual. And their relationship could shift from a purely mentor - student type to a more equal and understanding one.
Since lemon fics are often about romantic or sexual relationships in a more explicit way, a 'Tsunade and Sakura Lemon Fanfic' might focus on a romantic or sexual relationship between them. However, this goes against the original nature of their relationship in the Naruto series which is more about mentorship and comradeship. Such fics are also likely to be not suitable for all audiences due to their adult - themed nature.
There might be some 'Tsunade and Sakura Lemon Fanfic' out there in the vast world of fanfiction, but they are not really in line with the mainstream Naruto story. Moreover, a lot of such fics might not be well - written or might distort the characters. I would suggest focusing on the official manga and anime content instead. For example, the original Naruto series has amazing character development and story arcs for both Tsunade and Sakura that are much more engaging than most fan - made, potentially inappropriate fics.