It could be about a very dark and twisted situation where 'pain' is personified and is physically restraining or harming'sakura' in some way. Maybe it's a psychological horror story where sakura is a victim of some malevolent force represented by 'pain'.
Well, it could be that there are other characters in the background. Maybe there's a character who will come to sakura's rescue. Or perhaps there's a character who is controlling 'pain' and making it do these things to sakura. But from the title, pain and sakura are the most prominent ones.
Well, it could be a story about a moment of intense emotion. Maybe Saskue is angry at Sakura for some reason and pins her to the wall in a fit of rage. But then it might turn into a moment of realization for both of them, leading to a deeper understanding of their relationship.
The main characters are clearly Saskue and Sakura. Saskue is likely to be a complex character in this fanfiction, with his own motives and emotions that lead him to pin Sakura to the wall. Sakura, on the other hand, is probably the recipient of Saskue's actions and will have her own reactions and responses to the situation.
One possible interpretation could be a display of power. Itachi is a very powerful character, and pinning Sakura to the wall might be a way to show his dominance in the fictional scenario. It could also be a moment of shock or conflict, perhaps in a situation where their paths cross in an unexpected and tense way.
In the original Naruto storyline, Itachi and Sakura don't have such direct and extreme interactions. This fanfiction clearly takes a departure by creating this intense physical encounter. It adds a new layer of relationship that doesn't exist in the source material.
Fanfiction is fictional stories written by fans. In this case, it might be about a scenario where Itachi pins Sakura's wrists. It could be part of an action - filled, or perhaps a more complex and dramatic story within the fan - created world of the relevant anime or manga.
I'm not sure if it's a particularly popular type. There are so many different kinds of Naruto fanfiction out there, focusing on various relationships and scenarios. While the idea of Itachi and Sakura interacting in this way might be interesting to some, it may not be as widespread as other more common pairings or plotlines.
In such a fanfiction scenario, it could be a very intense situation. Maybe Kidomaru uses his six arms to physically restrain Sakura. This could lead to a fight where Sakura has to use her medical ninjutsu skills in a more combat - oriented way to break free. For example, she might use her chakra enhanced strength to push Kidomaru's arms away.
I'm not sure specifically about 'itachi pins down and marks sakura' fanfictions being popular. Fanfiction is a vast world, and while there may be stories with such a plot, it's hard to say if they are widely popular without doing a thorough search through fanfiction platforms. There are so many different types of Naruto - related fanfictions that it could easily get lost among the masses.