Perhaps in the fanfic, Sakura is forced into a situation where she has to kiss someone else to save a friend or loved one. This could lead to a complex web of emotions as she grapples with her feelings for the person she kissed and her existing relationships. For example, if she has a long - standing relationship with someone else, this unexpected kiss could cause jealousy and confusion all around.
One possible plot could be that Sakura is in an alternate universe where she has lost her memory and kisses someone else thinking they are her true love. Another could be that she is under a spell which makes her kiss someone else, and then she has to deal with the consequences of that action.
Maybe she kisses one of her rivals in a competition. This could be a way to throw the rival off - guard or perhaps it's a moment of sudden understanding between them that leads to the kiss. For instance, if they are in a magical competition and Sakura realizes that the rival has a side to them that she never noticed before, and in a moment of impulse, she kisses them.
Well, it could be a new character introduced in the fanfic. Maybe a mysterious stranger who has some special charm that attracts Sakura.
Maybe she falls in love with someone who truly understands her on a deeper level than her previous relationships. This person might be more attuned to her dreams and fears, and she decides to marry them for that deep emotional connection.
Another possibility is a civilian she has known for a long time in Konoha. Perhaps someone who has always admired her from afar, a merchant who supplies the hospital where she works. He might have shown his love and support for her over the years, and finally, Sakura realizes her feelings for him and decides to marry him.
It could be a jealous rival. Maybe there's another ninja who has feelings for Sakura and is trying to keep her away from Sasuke. So Sasuke has to catch her to prevent this rival from taking her away.
Well, in a 'mikan sakura betrayed fanfic', she could be betrayed by her family. Say her sister steals an important opportunity from her, like a chance to study abroad or participate in a big competition. It would be a huge betrayal as family is supposed to support each other. Also, in a magical or fantasy version, Mikan could be betrayed by her mentor in the art of magic. The mentor might use Mikan's trust to steal a powerful magical artifact that Mikan was supposed to protect.
Another plot could involve Sakura being forced to betray Naruto. Let's say an enemy captures someone she loves dearly, like her parents or Sasuke, and forces her to give information about Naruto in exchange for their safety. This would create a very complex and tragic situation for her.
Well, Naruto could be filled with a sense of pride for Sakura, like he's proud of who she is and how far she's come. The forehead kiss is his way of showing it. Sakura could be feeling a flutter of excitement. After all, a kiss on the forehead from someone as important as Naruto can stir up all kinds of emotions, and she may start to re - evaluate her feelings towards him in a more positive light.
Maybe the fanfic could be set in a post - war world. Sakura is tired of the constant fighting and death. She then encounters a kind - hearted artist. He shows her a different side of life, full of beauty and creativity. Their relationship develops slowly. However, Sasuke or Naruto might have some issues with her choice at first. But in the end, she follows her heart and marries the artist. The story could also include how she uses her ninja skills to protect the new peaceful life she has built with her new husband.
One possible plot could be that Leni and Lincoln are in a situation where they accidentally kiss during a game or a prank gone wrong. Then they have to deal with the awkwardness and figure out their feelings towards each other.