A possible fanfiction could revolve around a festival in the Hidden Leaf Village. Hinata is wearing a traditional yukata that shows off her thighs a bit. Naruto, being Naruto, doesn't quite know how to react at first. But as the day goes on, they get into various adventures at the festival and Naruto starts to see Hinata in a new light, with her thighs being a part of her overall charm that he's now more aware of.
One idea could be exploring how Naruto's father, Minato, and Hinata's father, Hiashi, first met and their initial impressions of each other. Maybe they were involved in a joint mission and had to overcome differences in their clans' traditions to work together effectively.
One idea could be that the mate mark is a hidden seal that only reveals itself when they are in true danger. It serves as a connection that allows them to share chakra and strength, enhancing their abilities when they fight together.
One interesting plot could be a mission where Naruto, Hinata and Sasuke have to work together. During the mission, Hinata's shy nature starts to break as she has to communicate clearly with both Naruto and Sasuke. Maybe there's a powerful enemy that only their combined skills can defeat. Naruto uses his Rasengan, Sasuke his Chidori, and Hinata her Byakugan - based techniques in a coordinated attack.
One idea could be that during their training, Naruto discovers a new form of chakra control while Hinata helps him by using her Byakugan to analyze his flow. Another could be they train in a secret location filled with ancient ninja challenges that test both their physical and mental strength.
One idea could be Naruto finding out about Hinata being abused and vowing to protect her at all costs. He could train her to be stronger so she can defend herself in the future.
One plot idea could be that Naruto and Hinata are on a mission together. They encounter a powerful enemy who uses a strange jutsu that causes them both to faint. When they wake up, they find themselves in a strange, dream - like realm and have to find a way to escape while also dealing with their feelings for each other.
A plot could revolve around a mysterious threat in the village that only Hinata's Byakugan can detect. Naruto, being eager to protect the village, teams up with her. Along the way, they encounter various challenges and have to rely on each other's skills. Hinata's shy nature starts to fade as she works closely with Naruto, and they grow closer as friends or something more.
Another interesting plot could be that there is a prophecy about a Kitsune - human union (Hinata being part Kitsune and Naruto being human) that will save the ninja world from a new, powerful dark force. They initially don't believe it but as strange events start to unfold, they realize it might be true and must embrace their unique bond to face the threat.
A possible plot could be a story set in an alternate universe. Naruto is not the hero he is in the original story, but Hinata and Tenten believe in his potential. They work together to help Naruto find his true self and his powers. Along the way, they encounter old enemies who are now much more powerful, but through their combined efforts and friendship, they manage to grow stronger and face the challenges.
In a fanfiction, Naruto could manipulate Hinata's social interactions. He might notice that Hinata is often left out or too shy to join in with the other ninjas. So, Naruto starts to engineer group activities where Hinata is included. He could also manipulate how others perceive her by highlighting her strengths and kind nature, which would not only boost her confidence but also change the dynamics within the ninja community.