How can the relationship between Natsu and Lucy in a family fanfiction be developed further?

They can develop their relationship by having small, everyday moments. For example, sharing breakfast together as a family, where they talk about their plans for the day. Natsu could show his love for Lucy by being more protective of her and their family in dangerous situations. Also, they could have inside jokes that only their family understands, which would strengthen their bond.

Lucy could give Aquarius more freedom outside of the key. Let her experience the human world more often. They could go on adventures that are not related to Fairy Tail's main quests, just the two of them. This would allow them to get to know each other on a more personal level. Aquarius could also teach Lucy more about celestial magic and its deeper secrets, which would bring them closer as they explore this knowledge together.

They could have flashbacks during the wedding planning of all the times they've saved each other. This would deepen their connection and show how far they've come. For example, when Natsu saved Lucy from the Phantom Lord attack.

Their relationship can be developed by having them share secrets. For example, Aslan could reveal to Lucy some of the deepest mysteries of Narnia that no one else knows. This would create a special bond between them.

Ichigo could start to take more interest in Orihime's hobbies and vice versa. This would show that they are not just a couple who love each other, but also friends who want to know each other better. For instance, if Orihime likes cooking, Ichigo could start to learn cooking from her and they could have some lovely family dinners together.

As they travel, their bond deepens. They start to rely on each other more. Natsu becomes more protective of Lucy, and Lucy begins to understand Natsu's impulsive nature better.

They could be given a task that requires them to rely on each other completely. Let's say they have to find a lost heirloom in a far - off land. Along the way, they share stories from their childhoods that they haven't told before. Rapunzel tells Flynn about her lonely days in the tower in more detail, and Flynn opens up about his early days as a thief. This deepens their bond.

Their relationship can be developed by having them share more personal stories about their past with the dragons. For example, Natsu could tell Wendy about Igneel's funny habits, and Wendy could share her memories of Grandeeney. This would strengthen their bond as siblings who share a common dragon - slayer heritage.

In fanfiction, their relationship can be developed by introducing cultural exchanges. Since Prince Caspian is from Narnia and Lucy is from England, they can teach each other about their respective cultures. Lucy can introduce Caspian to things like tea - time and proper English manners, while Caspian can show Lucy the unique traditions and magic of Narnia. This exchange of knowledge and experiences can bring them closer together and create a more complex and interesting relationship.

In fanfiction, their relationship can start with a simple conversation. For instance, they could be talking about their magic abilities. This initial exchange can lead to more interactions. They might start training together, and during these training sessions, they get to know each other better on a personal level.