Well, one possibility is that Naruto helps Tora who might be in some sort of trouble in the village. Maybe Tora got lost outside its usual territory and Naruto uses his ninja skills to find it and bring it back safely. This could lead to a new friendship where Tora starts to follow Naruto around, much to the amusement of the villagers.
It could be a rogue ninja who has a vendetta against cats for some strange reason. This ninja might try to capture Tora to use it as bait for Naruto or just because he wants to harm it. So, he becomes the main obstacle in Naruto and Tora's friendship.
One possible plot could be that Naruto is assigned the task of taking care of Tora long - term. He tries to train Tora to be a ninja cat, teaching it basic stealth and combat skills. Along the way, they form an unbreakable bond and go on mini - adventures in the village, getting into all sorts of comical situations like chasing mice that are actually small summons gone astray.
Sasuke would probably be indifferent at first. He is more focused on his own goals of getting stronger. But if Tora somehow gets involved in a situation that affects Sasuke's plans or if Tora shows some useful skills, he might start to respect Naruto's decision to keep Tora. For example, if Tora helps them track an enemy ninja.
In such a fanfiction, Naruto might first encounter Tora while on a mission in the village. He could use his kind-hearted nature to gain Tora's trust. For example, Naruto might share his food with Tora, which is a simple yet effective way to start a friendship. Then, they could go on little adventures together around the village, like exploring hidden corners or chasing after little critters.
Maybe fem Tora is actually a transformed being, and Naruto discovers her secret. Instead of turning her in, he decides to help her control her powers. As they spend more time together, they fall in love. Their relationship is then tested when the village elders find out about fem Tora's true nature and try to separate them.
A non - lemon Naruto Tora fanfiction could be about Naruto befriending Tora. Maybe Naruto is on a mission to find Tora who has run away again, and during the search, he discovers some interesting things about Tora's habits or the places it likes to hide. It could also involve Naruto trying to train Tora to be a little ninja cat in a humorous way.
It could be that Tora is attracted to the unique characters in Naruto fanfiction. There are so many different personalities and powers that might be appealing to a cat's curious nature.
Some of Naruto's friends could be really enthusiastic about his new friendship with Tora. Choji might offer Tora some of his favorite snacks. Ino could try to dress Tora up in cute little outfits. However, Neji might be a bit skeptical at first, thinking that Tora could be a distraction for Naruto. But as he sees the positive impact on Naruto, he would come around.
One idea could be that the necromancer uses Tora's unique cat abilities in the afterlife to gain an edge in battles. Maybe Tora can move unseen in the spirit realm and spy on enemies for the necromancer. Another plot idea is that the necromancer brings back Tora not just as a normal cat, but as a powerful spirit guardian with special powers related to the nine - tailed fox's chakra, since Naruto has that connection. It could also be interesting if the necromancer's actions with Tora draw the attention of the hidden villages, causing both suspicion and curiosity.
One possible plot could be that Naruto, with his unwavering belief in redemption, tries to understand Madara's past grievances. He might start by finding common ground in their love for the Hidden Leaf, despite Madara's later turn against it. Naruto could use his talk - no - jutsu to gradually break down Madara's walls of hatred. They could then team up to face a new, greater threat that endangers the entire ninja world. This new threat would force them to combine their skills, Naruto's Rasengan and Madara's Susanoo for example, in unique ways to protect what they both once held dear.