One possible plot twist could be that Naruto actually steals something from Kakashi that he thought was unimportant, but it turns out to be a key to a hidden jutsu or a secret mission. Another could be that Kakashi knew Naruto was going to pickpocket him all along and let it happen as part of a training exercise. Maybe Naruto pickpockets Kakashi, but then realizes he has to return the item quickly because it's something that Kakashi needs to save the village.
In this fanfiction, a plot twist could be that Naruto pickpockets Kakashi in order to get a special item to help a friend in need. But then he finds out that the item is cursed and starts causing trouble for him. Maybe the item he steals has the ability to control time, and Naruto has to figure out how to use it properly without causing chaos. Also, it could be that Kakashi was using the item as bait to catch a real thief in the village, and Naruto gets caught up in that whole situation.
Well, a plot twist might be that when Naruto pickpockets Kakashi, he discovers a note that reveals a dark secret about Kakashi's past. Or perhaps Naruto accidentally pickpockets a summoning scroll that summons a really strange and powerful creature that he has no idea how to deal with. It could also be that Kakashi has some sort of anti - pickpocketing jutsu that activates when Naruto tries, and it ends up teaching Naruto a valuable lesson about stealing.
Well, one possibility is that Naruto is forced into pickpocketing the ANBU due to some dire situation. Maybe he needs to steal a special item from them to save a friend. For example, if his friend is poisoned and the only antidote is in the possession of an ANBU member, Naruto might see pickpocketing as the only option.
One possible plot twist could be that they face opposition from the Hidden Leaf Village. Since same - sex relationships might not be as openly accepted in the traditional ninja world. Another twist could be that they have to go on a dangerous mission together right after getting married, which tests their new relationship. And perhaps there's a secret enemy who wants to break them apart because their union represents a new kind of hope in the village.
One possible plot twist could be that they discover their brotherhood in a very unexpected way. For example, during a dangerous mission, Kakashi might get severely injured and in a moment of delirium, he reveals a long - hidden memory that points to their relation. Naruto, being shocked at first, then realizes it explains some of the strange feelings of connection he had towards Kakashi all along.
Maybe Naruto adopts Kakashi in a post - war scenario where Kakashi has lost his purpose. Naruto, seeing Kakashi's lost state, decides to take him under his wing. As a result, Kakashi starts to learn new jutsus from Naruto and they develop a bond that is more like brothers. This would be a great opportunity to explore their characters in a different dynamic.
A really interesting plot twist could be that female Naruto is actually from an alternate dimension where she and Kakashi are already married. In this new world, things are different, and she has to figure out how to make their relationship work in this dimension too. Plus, there could be a character who is jealous of their union and tries to break them apart by spreading false rumors about Kakashi's past, which female Naruto has to deal with.
One possible plot twist could be that their relationship is initially opposed by the village elders. They might see it as unconventional or worry about how it could affect Naruto's role as a potential Hokage. Another twist could be that an old enemy resurfaces and targets Kakashi to get to Naruto, seeing their marriage as a weakness to exploit.
One possible plot twist could be that Naruto's love for Kakashi from the past disrupts the timeline. Maybe his feelings cause him to unknowingly change events that were supposed to happen. For example, he might prevent Kakashi from making a certain decision that was crucial in the original timeline.
One possible plot twist could be that Kakashi discovers Naruto has a hidden power that no one else is aware of. This could change the whole dynamic of their relationship. Maybe it's a new type of chakra that only Kakashi can help him control.
One possible plot twist could be that Kakashi, as a girl, has to deal with different social expectations in the ninja world. For example, she might face more restrictions in combat training because of her new gender. Another could be that she uses her new form to her advantage in undercover missions, fooling enemies who are less likely to suspect a female. Also, there could be a romantic plot twist where a character who previously saw Kakashi as a rival now has different feelings for her as a girl.
One possible plot twist could be that it's all a dream of Sakura's. Maybe she has a deep - seated longing for Kakashi, but she's been suppressing it. And the kiss in the fanfiction is her subconscious mind's way of expressing that hidden desire.