Another plot might be that Wendy gets lost in a mysterious forest, and Natsu goes in to find her. In the forest, they discover an ancient magic that they have to figure out how to control together, which strengthens their bond as friends and comrades in the Fairy Tail guild.
A third plot could be that a new and powerful enemy targets Wendy because of her unique healing magic. Natsu vows to protect her, and they embark on a journey to make Wendy strong enough to defend herself. This journey involves training sessions, where Natsu teaches Wendy some of his more aggressive combat techniques, and Wendy in turn shows Natsu how to better control his own magic in a more refined way.
One interesting plot could be that Natsu and Wendy travel back in time to the era when dragons were still abundant. They could learn powerful dragon - slaying magic directly from the dragons, which would not only enhance their powers but also give them a deeper understanding of their own abilities and the history of dragon slayers. This could lead to new friendships with the dragons and change the course of future events in their original timeline.
One interesting plot could be Natsu going back in time to prevent a great disaster that happened in the past of his world. For example, he might try to stop the initial attack of a powerful dark guild that had long - lasting negative impacts. Another plot could involve Natsu traveling back to his own childhood and having to deal with his past self, which could lead to some comical and heartwarming moments as he tries to impart some of his current wisdom.
Since we should avoid adult - related content, there are many great non - adult Natsu and Wendy stories out there. You could search for ones that focus on their growth as characters within the Fairy Tail universe. For example, stories about them going on quests together and developing their magical abilities side by side.
One interesting storyline could be Natsu and Wendy going on a special mission together. Maybe they have to find a rare magical item that can save the guild. Along the way, Natsu's impulsiveness gets them into some trouble, but Wendy's healing magic and calm nature help them get out of it.
One interesting plot could be Wendy and Chelia going on an adventure together to find a rare magical artifact. They face various challenges along the way and their friendship grows stronger through it.
One possible plot could be that the kidnappers are from a rival guild who want to use Natsu as leverage against Fairy Tail. Gray could then embark on a solo mission to rescue Natsu, facing various traps and enemies along the way. He might have to use his ice - make magic in creative ways to overcome obstacles.
Perhaps in the fanfiction, Wendy is kidnapped by a group of pirates who mistake her for someone else. Peter Pan, with his flying ability and knowledge of Neverland, tracks them down. He uses his charm and cleverness to outwit the pirates and save Wendy. This could involve a lot of sword - fighting and narrow escapes on the high seas within Neverland.
One interesting plot could be their journey of getting to know each other on a deeper level before the marriage. Maybe they go on adventures together and face challenges that strengthen their bond. Another could be how their friends in the guild react to their relationship and upcoming marriage, with some being overly excited and others being a bit more cautious.
Another plot could be a story set in a different time period. They are transported to the past and have to adapt to the old ways while also trying to find a way back to their own time. In this journey, they rely on each other a great deal and their bond becomes unbreakable.
Another plot could be centered around their fears and hopes. Lucy might be worried about being a good mother, considering her own upbringing. Natsu, on the other hand, could be full of hope that their child will be as strong as him, but also a bit scared that he won't be a good enough father. He then decides to go on a journey to learn from other dads in the guild.