Perhaps Anko is trapped in a genjutsu and Naruto uses his own experience with breaking free from illusions to save her. He could sense her distress and use his chakra to disrupt the genjutsu, freeing Anko. This would show Naruto's growth and his ability to help those in need, even a more experienced ninja like Anko.
One possibility is that Anko is poisoned during a mission. Naruto, having learned some medical ninjutsu from Tsunade, uses his skills to find an antidote and save her. He might have to search far and wide, facing various challenges along the way.
In a 'naruto saves anko' fanfiction, Naruto might find Anko in a dangerous situation like being trapped in a genjutsu by a rogue ninja. Naruto, with his strong will and Uzumaki chakra, could break the genjutsu and save her. He'd then comfort her and they might form a stronger bond, leading to Anko having more faith in the new generation of ninja.
It could be a rogue ninja from Orochimaru's former experiments. This ninja might hold a grudge against Anko for betraying Orochimaru and decides to target her. Naruto would then have to face this powerful and vengeful enemy to save Anko.
Often, they focus on the relationship between Naruto and Anko. The 'lemon' aspect usually means there are some romantic or sexual undertones in the story. For example, they might describe the characters' physical attraction to each other in a more explicit way compared to regular fanfiction.
Naruto's character could develop a sense of protectiveness towards Kurenai and Anko. He might become more mature in his decision - making, as saving them would require careful planning and not just brute force.
There are some really interesting ones out there. For example, there might be fanfictions where Naruto teams up with Tayuya and Anko in some sort of mission involving a 'lemon' - which could be a code name for something or an actual lemon - like a rare fruit that has some magical properties in the story's universe. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for the characters' names and see what pops up.
There's also 'Hana's Unusual Encounter'. This one focuses more on Hana's perspective. The lemon parts are tastefully done and not too explicit. It weaves a story that includes adventure along with the relationship dynamics. The story builds up the connection between the characters gradually, which makes it more believable.
These fanfictions can be special because they often deviate from the main plot of Naruto in a creative way. For example, they might explore different time periods or alternate universes where Anko and Hana's relationship can develop in unique ways. They also give more screen time, so to speak, to characters who might not have had as much focus in the original series. The lemon elements can enhance the chemistry between the characters and make the story more captivating.
One possible scenario could be that the Anbu arrives just in time as Anko is about to use a dangerous jutsu on Naruto. The Anbu might use their superior speed and stealth to disarm Anko and rescue Naruto. Another scenario could be that the Anbu has been secretly observing Anko's actions towards Naruto, suspecting her of having some malicious intent. So they step in when they see Anko cornering Naruto. Maybe the Anbu uses some special ninjutsu to create a diversion and then whisks Naruto away to safety.