Well, perhaps in a fanfiction, there is a powerful magic that links the Naruto universe and the Fairy Tail universe where Lucy is from. Naruto is on a mission to understand this new magic when he meets Lucy. They initially have misunderstandings but as they learn about each other's worlds and goals, they start to fall for each other. The kiss could be a moment of realization of their feelings during a battle where they protect each other. This kind of plot would blend the elements of both universes in an exciting way.
One possible plot could be that Lucy, from another dimension or world, accidentally ends up in the Naruto universe. Naruto, being the curious and friendly ninja he is, befriends her. As they go on adventures together, they gradually develop feelings for each other and end up sharing a kiss. Maybe they have to face some common enemies or overcome cultural differences along the way.
One possible plot could be that Lucy has a sudden change of heart towards Charlie Brown. Maybe she realizes how kind and genuine he is after he helps her in some way. This new - found respect and admiration leads to a moment where they share a kiss.
The plot could involve Naruto being sent to Fiore as part of a diplomatic mission on behalf of the Hidden Leaf Village. There, he meets Lucy at the Fairy Tail guild. At first, the members of Fairy Tail are a bit skeptical of Naruto. But Naruto's determination and his cool ninja abilities start to win them over. Lucy and Naruto bond over their shared experiences of losing loved ones. They then go on an adventure together to stop a dark force that is threatening both their worlds.
Well, one possibility is that Naruto uses his ninja skills like shadow clones to distract the enemies that are after Lucy. He could then use his Rasengan to break through any barriers between Lucy and safety.
Yes, there are likely fanfictions with this concept. Naruto and Lucy are from different anime/manga universes, which makes for an interesting crossover in fanfiction. Some might explore a romantic relationship between them in unique and creative ways. For example, they could meet in a strange alternate dimension where their worlds collide, leading to that kiss. It really depends on the creativity of the fanfiction writer.
The plot could revolve around a magical or cursed situation. For instance, a spell has been cast that forces Naruto and Rogue to kiss as a way to break a greater curse. After the kiss, they start to share emotions and memories, which then drives them to figure out who cast the spell and why. Along the way, they learn about each other's cultures and powers, and a relationship gradually forms between them.
A plot could revolve around a prophecy that only Naruto and Konan together can fulfill. As they search for the meaning of the prophecy and how to complete it, they grow closer. The kiss might occur when they finally understand the true nature of the prophecy and their role in it. It could also be that there is a dark force trying to prevent them from fulfilling the prophecy, and their love, shown through the kiss, gives them the strength to overcome this obstacle.
Maybe Naruto is on a mission to a place that has some connection to Erza's world. They meet by accident and at first, they don't get along because of their different ways. But as they learn more about each other's pasts and struggles, they start to respect and like each other. Eventually, during a festival in a village they are passing through, they get caught up in the moment and kiss.
One possible plot could be that Naruto and Anko are on a mission together. They get separated from the rest of their team and end up in a dangerous place. As they rely on each other to survive, they start to see each other in a new light, and eventually, they share a kiss.
Well, it could start with Shizune being assigned to train Naruto in some aspect, like medical ninjutsu for self - preservation. As they spend time together, Naruto's charm and determination start to win Shizune over. They might have a moment of vulnerability, for example, when Naruto shares his insecurities about being Hokage. This emotional connection could build up to a kiss. And then the story could continue with how they deal with the consequences of this new relationship in the context of the Naruto world.