Yes, it is a bit strange. Sasuke is not the type to engage in reading fanfics in general, let alone watching Sakura kiss in one. His focus has always been on his own goals and his relationship with his comrades in a more serious, non - fictional context.
On the other hand, Sasuke could be very stoic about it on the surface but internally be in turmoil. He might start to analyze his own actions and whether he had missed any signs from Sakura. He could also be the type to immediately start thinking of ways to win Sakura back if he realizes he can't stand the thought of her with someone else.
In a more complex scenario, Sasuke seeing Sakura kiss could be a turning point in their relationship within the fanfic's universe. If it's out of the blue for him, he could become angry or confused. He might question Sakura's loyalty or his own assumptions about their bond. It could also lead to him distancing himself from her, or conversely, finally realizing his true feelings and trying to win her back.
There's also 'The Unspoken Promise'. Here, the kiss is more of a spontaneous act in the midst of a dangerous situation. It shows how their relationship has evolved in the fanfic's unique universe.
A Sasuke Yandere x Sakura fanfic often explores a rather intense and possessive relationship. In such a fic, Sasuke's yandere traits would likely make him extremely protective of Sakura. He might go to great lengths to keep her all to himself, which could add a lot of drama to the story.
A lot of Sasuke x Sakura romance fanfic focuses on the emotional journey. There are the moments of jealousy, especially when other characters seem interested in either Sasuke or Sakura. The fanfics might also delve into how they communicate or rather struggle to communicate their feelings. Since Sasuke is not the most expressive, it creates a lot of tension and drama that makes the romance aspect more interesting. Some fanfics may also include flashbacks to their early days together in Team 7 to show how their relationship has evolved.
There's 'The Path to Redemption'. In this fanfic, Sasuke has to face the consequences of his past actions, and Sakura is there to support him. It's a well - written story that shows how their bond can grow stronger through hardships. It also has some interesting side characters that add depth to the plot.
One possible plot twist could be that Sasuke, after seeing Sakura kiss someone else in the fanfic, realizes his true feelings for her. Maybe he had been suppressing his emotions all along, but this event makes him confront them. It could lead to a journey of self - discovery for him, where he has to decide whether to fight for Sakura or let her go.
First, you need to establish the relationship between Sasuke and Sakura. Are they already in a relationship or still in the pining stage? If they're in a relationship, you can create a situation where an outsider threatens their bond. For example, a new ninja arrives in the village who has a similar personality to Sasuke and shows interest in Sakura. Then, describe Sakura's reaction. Will she be flattered or immediately reject the new person? For Sasuke, show how he notices Sakura's reaction and how it makes him feel jealous. You can also include internal monologues for both characters to really delve into their emotions.
One popular trope is the 'forbidden love' angle. Given Sasuke's past actions and his often - solitary path, their relationship can be seen as something that goes against the norm in the Naruto universe. Another is the 'reunion' trope. After Sasuke's long absences, fanfics often focus on the emotional and sometimes awkward reunions between him and Sakura.