They could face challenges in terms of trust. Given Itachi's past of secrecy and Hinata's insecurities, it might take time for them to fully trust each other. There may also be external threats that target their relationship because of the power and influence their combined clans hold. For instance, enemy ninja might try to drive a wedge between them. And on a personal level, Hinata may struggle to keep up with Itachi's high - level ninja skills in some situations, which could lead to self - doubt and potential friction in their marriage.
One possible plot could be that Itachi, having returned from his past troubles in a way that allows him to start anew, meets Hinata. They initially bond over their shared experiences of being in powerful ninja clans with high expectations. Hinata's gentle nature softens Itachi's reserved self. Their marriage could be arranged by the clans for political reasons at first, but they gradually fall in love as they get to know each other better. They face challenges together, like dealing with the prejudices of some in the ninja community who question their union due to Itachi's past actions and Hinata's supposed meekness. But through their love and determination, they prove everyone wrong and build a happy life together.
First, understand the characters well. Itachi is a complex character with a tragic past, so you need to show how his relationship with Hinata is different from his other relationships. For the kiss, describe the emotions clearly. Is it a hesitant kiss at first? Then, for Hinata, capture her shyness and how she overcomes it. Set the scene carefully, whether it's a simple ceremony or a grand event. And don't forget to add some dialogue before or after the kiss to build up the tension and significance.
One challenge could be Sasuke's aggression. Since he is in a nightmare state, he might be extremely violent and not recognize Hinata as a friend. Hinata would have to be very careful not to get hurt while still trying to reach out to him.
I'm not sure about a specific 'itachi x hinata x sasuke fanfic' to recommend. You could try searching on fanfiction websites like Archive of Our Own. They usually have a wide variety of fanfics, and you might be able to find one that involves this particular pairing.
Maybe in the fanfic, Itachi returns from the dead in some sort of magical or mysterious way. Sasuke is initially conflicted about his brother's return, and Hinata, with her kind heart, tries to bridge the gap between the two Uchiha brothers. Along the way, feelings start to develop between all three characters, and they must navigate their new relationships while also dealing with threats to the Hidden Leaf Village.
One common theme is the exploration of an unlikely friendship. Given their different backgrounds and clans in the Naruto universe, a fanfic might focus on how they bridge the gap between them. Another theme could be redemption. Itachi has a lot of baggage in his past, and Hinata's kind nature could play a role in his journey towards redemption.
It could be a very tender moment. Itachi, with his usually stoic nature, might show a rare softness as he kisses Hinata. Hinata, being shy, would probably blush deeply. The kiss could symbolize the union of two very different yet equally complex characters. It might also be a moment of great significance in the fanfic's plot, perhaps sealing a new alliance or just a beautiful expression of their love for each other.
One challenge could be the high expectations from others. Just as Itachi had the weight of the Uchiha clan on his shoulders, Naruto might face the pressure of living up to the image of a prodigy. People would expect him to perform at a high level all the time.
One challenge could be their clan differences. The Uchiha and the Hyuga have their own traditions and expectations. Itachi might face opposition from his clan for getting involved with a Hyuga, and Hinata could face the same from hers. Another challenge would be Itachi's past actions. His role in certain events in the village might make Hinata question whether she can truly trust him. Also, Itachi's loyalty to the village might conflict with his love for Hinata at times, as he may have to make difficult choices that could put their relationship at risk.
Another type of fanfiction could be set in an alternate universe where the ninja clans have different alliances. Itachi and Hinata might be paired up on a mission together. During the mission, they discover new sides of each other. For example, Hinata might show her unexpected courage which Itachi admires.