One idea could be that in a post - Dragon Cry adventure, Natsu and Lucy are sent on a mission to a hidden island where ancient dragon magic is said to be sealed. Along the way, they face various obstacles that test their bond, like a powerful sorcerer who tries to split them up. Another plot could involve Natsu losing his dragon slayer powers temporarily, and Lucy having to protect him while they search for a way to restore his powers using the knowledge from the Dragon Cry incident.
Their relationship could develop through shared danger. For example, if they are trapped in a magical maze as a result of the Dragon Cry's after - effects. Natsu's impulsive nature might get them into trouble, but Lucy's strategic thinking gets them out. This mutual reliance can deepen their bond. Also, if Natsu discovers a new side of Lucy, like her hidden strength or a special magical ability she has been suppressing, he may start to see her in a new light, which could lead to a more romantic development.
If Lucy never joined Fairy Tail, the friendships and relationships among the characters would form in a very different way. Also, many of the story arcs might not unfold as they do in the original plot.
In a 'Fairy Tail Lucy becomes a Dragon Slayer' fanfic, it could start with Lucy being in a life - threatening situation. To survive, she unknowingly absorbs the power of a dying dragon. This power starts to change her. At first, she is scared of the changes. But then, with the support of her friends, she decides to embrace it. She then begins a journey to master her new powers. She might learn that her Dragon Slayer magic is linked to a special type of celestial spirit that has dragon - like qualities, and she has to find and bond with this spirit to fully control her powers.
It could be a rogue Dragon Slayer who is jealous of Lucy's new - found powers. This character might have been exiled from their own guild for misusing their powers and now sees Lucy as an easy target to prove their superiority.
There is a fanfiction called 'Lucy in the Alternate Realm'. This one is interesting because it sends Lucy to an alternate realm where she has to find her way back. Along the way, she meets different versions of her friends and has to use her wits and magic to survive. It's a great read for any 'Fairy Tail' and Lucy fan.
Yes, there are many non - inappropriate 'Fairy Tail Lucy' fanfictions. For example, some focus on her adventures and growth within the Fairy Tail guild. They might explore her relationships with other guild members in a friendly and positive way, like her friendship with Natsu and how they support each other during quests.
I think it depends on how it's handled. If the 'naked' aspect is just a shock - value title and the actual fanfiction is more about exploring Lucy's character growth, relationships, or her adventures in a tasteful way, it could be okay. But more often than not, it gives the wrong impression and might not be suitable for the overall Fairy Tail community which values things like friendship, courage, and magic more than such potentially inappropriate themes.