A plot could be set in a wintery landscape. Natsu, being a fire - dragon slayer, is always warm. Lucy, on the other hand, is freezing. They find a hot lemon - scented spring. As they soak in it to warm up, they start sharing stories from their past. This leads to a deeper understanding of each other and the start of a romantic relationship.
Well, perhaps Natsu and Lucy enter a cooking competition in a magical world. They decide to make a special hot lemon dish. While preparing it, they get into all sorts of comical mishaps, like Natsu accidentally setting the kitchen on fire with his dragon breath. But through all this, they grow closer and realize their love for each other, much to the delight of their friends who are watching the competition.
One possible plot could be that Natsu and Lucy go on a dangerous mission together. In the middle of it, they find a mysterious lemon - like magical item. As they study it, they start to feel a strange warmth between them. They then have to overcome their initial shyness and admit their feelings for each other while dealing with the power of this strange item.
A possible plot could be that their married life is disrupted by a mysterious force that is causing chaos in the magical world. Natsu and Lucy, being the strong couple they are, set out to find the source of this problem. As they journey, they discover secrets about their own powers and how their union might be the key to saving the world. There could be moments of doubt and fear, but their love for each other always pulls them through.
The main characters are clearly Natsu and Lucy. Natsu is a powerful dragon slayer with a fiery personality. He's impulsive and brave. Lucy is a celestial wizard. She's smart and kind - hearted. Together, they form an interesting pair in the fanfic.
In the fanfiction, the lemon hot spring could be a place of peace for Natsu and Lucy. The lemon essence in the water could have a rejuvenating effect on them. Natsu could show his protective side towards Lucy in this setting. For example, if there were any small creatures around that seemed threatening, he would be on guard. And Lucy, in turn, could share her thoughts on the beauty of the place with Natsu, deepening their friendship.
A simple plot could be that Natsu and Lucy are exploring a new area and stumble upon a hidden lemon hot spring. They decide to take a dip. While in the hot spring, they notice some strange glowing fish in the water. Natsu wants to catch one, but Lucy warns him not to. Of course, Natsu being Natsu, he tries anyway and ends up causing a bit of chaos in the hot spring.
One good story could be 'Natsu and Lucy's Adventure in the Lemon Grove'. In this fanfiction, Natsu and Lucy find themselves in a magical lemon grove where they have to solve a mystery related to the hot lemons. It has a lot of sweet and adventurous moments between them.
Well, one possible plot could be that Natsu and Lucy's relationship evolves from friendship to something more romantic. Then, an unexpected pregnancy occurs which throws their lives into chaos. They might have to face the reactions of their friends and deal with their own fears and insecurities about becoming parents.
I'm not sure specifically as I haven't read this particular fanfiction. But generally, it might involve Natsu and Lucy having some sort of adventure or interaction at a lemon spa. Maybe they go there to relax after a tough mission and something unexpected occurs during their time at the spa.
In a fanfiction scenario, they could be at the lemon - scented hot spring alone, and Natsu discovers that the hot spring has some sort of magical property that makes him more in touch with his emotions. He then starts to confess to Lucy how much he values her as a teammate and friend, but in a more heartfelt way than usual. Lucy is touched and they have a really sweet moment together.
In this fanfiction scenario, Natsu and Lucy might have a relaxing time in the lemon - scented hot spring. They could start with some light banter, Natsu being his usual energetic self while Lucy is a bit more reserved at first. Maybe they share stories about their recent quests and gradually grow closer in this serene setting.
A good one has well - developed characters. Natsu and Lucy should be in - character, with their personalities intact from the original series. For example, Natsu's impulsiveness and Lucy's determination. The 'lemon' part should be tastefully done, not just gratuitous. It should add to the relationship development between them.