One possible aspect could be that in fanfiction, Kidomaru's six arms might be used in a very unique way in relation to the sakura. For example, he could use his multiple arms to perform some sort of special dance or ritual among the sakura trees. This could be a part of a cultural or spiritual event within the fan - created world. Maybe his six arms give him an advantage in collecting sakura petals for some magical purpose, like creating a powerful potion or a charm that is related to the beauty and transience of the sakura.
One possibility is that this encounter is a result of a misunderstanding. Kidomaru might mistake Sakura for someone else and pins her with his six arms. Sakura, in shock, has to quickly figure out how to communicate with him to clear the confusion.
The six arms could be used for combat in a sakura - themed setting. He might use them to swing from sakura branches, using the trees as a sort of battlefield advantage. His arms could also be used to grab and throw sakura - covered boulders or other objects at his enemies.
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.
Obviously, Sakura and Kidomaru are the main characters. Sakura, the strong - willed kunoichi from the Naruto series, and Kidomaru, one of the Sound Four members.
Perhaps the fanfiction focuses on Sakura's mental struggle as well. While in Kidomaru's arms, she might be thinking about her friends, her training, and how she can outwit him. She could be recalling all the jutsu she has learned and strategizing on how to turn the situation around. For example, if she has some knowledge of Kidomaru's weaknesses from previous battles or intel, she could be planning to use that to her advantage while still in his grasp.
I'm not sure specifically as I haven't read this exact fanfiction. But generally, it might involve Sakura facing various challenges or difficulties while in the situation related to Kidomaru's six arms. It could be about her trying to overcome physical battles or dealing with emotional turmoil in that particular fan - created scenario.
Obviously, Sakura and Kidomaru are the main characters. Sakura is the one who is struggling, and Kidomaru with his six arms is the source of the struggle.
Well, having six arms would give Naruto more options in combat. He could use multiple jutsus simultaneously. For example, he could form Rasengan in three hands while using shadow clones with the other three to distract his opponents. This would make him more unpredictable and powerful in battles.
Maybe it's some kind of experimental jutsu gone wrong. Some rogue ninja or a mad scientist - type character could have been experimenting on Naruto, and as a result, he ended up with six arms.