There might be. However, these kinds of very specific fanfics can be quite rare. The Naruto and Fairy Tail universes are both huge, and while there are a lot of crossovers, it's not guaranteed that there's a fanfic with Erza kissing Naruto's neck. You should use the search functions on fanfic platforms carefully, using relevant tags like 'Naruto', 'Fairy Tail', and 'crossover' to narrow down your search.
Maybe they are in a recording studio working on a song. The atmosphere is charged with unspoken feelings. Austin, caught up in the moment, kisses Ally on the neck. This surprises Ally at first, but then she realizes her own deep feelings for Austin and they start a new chapter in their relationship.
In some fanfictions, this might be a spontaneous act. Rachel could be overcome with emotion, perhaps realizing her true feelings for Ross in that instant and the neck kiss is a very intimate, yet somewhat impulsive gesture. It could be a turning point in their relationship within the fan - created story.
It could signify deep affection. In fanfiction, such a gesture might show that Percy is very comfortable and close to Annabeth, and it's a more intimate form of showing his love compared to a simple cheek or lip kiss.
Ally might be initially shocked as it's an unexpected display of affection. But then she could feel a rush of warmth and affection towards Austin. Austin, on the other hand, might be a bit nervous after the kiss, worried about how Ally will take it.
In a potential plot, Naruto could be accidentally transported to the Fairy Tail guild. Erza, being one of the more prominent members, is assigned to help him adjust. As they spend time together, Naruto's positive attitude and his own set of skills start to win Erza over. The neck - kissing could be a culmination of a slow - burning romance. It might be a very private moment that occurs after they've shared some deep conversations about their pasts, their goals, and their fears. This moment could then be a turning point in their relationship, leading to them having to deal with the implications of such an inter - universe relationship, like how it would affect their respective quests and the people around them.
One possible plot could be that Yusei and Akiza are in a dangerous situation. Yusei, to comfort Akiza, gives her a gentle kiss on the neck as a sign of his deep affection and his determination to protect her. It could be a moment of intense emotion before they face a great challenge together.
The writer could focus on the physical details. For instance, describe how Yusei's lips softly touch Akiza's neck, like a gentle caress. Maybe mention the warmth of his breath on her skin, creating a tingling sensation for Akiza.
In online literature, strangling a princess was a common plot. It was usually used to express the love and hate between characters, power struggles, and so on. In writing, one had to pay attention to the rationality of the plot and the emotional logic of the characters. One had to avoid excessive violence and bloody descriptions to avoid causing discomfort to the readers.
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Again, without knowing the actual story, it's difficult to say. But generally, his big neck could be a symbol of something unique about him, like his strength if it's a story about a warrior, or it could be a mark of his difference in a society that values uniformity.