By having them go on adventures together. As they face perils like battles against dark creatures or solving mysteries in Narnia, they'll learn more about each other and their relationship can grow.
You could develop their relationship through shared secrets. For example, if they both discover a hidden prophecy that only they know about, they'll be bonded by this knowledge. They'll have to trust each other and rely on one another to figure out what the prophecy means and how to act on it. This will bring them closer and develop their relationship in a deeper way.
The relationship can be developed through shared adventures. For example, they could be on a mission to retrieve a lost magical artifact. During this journey, they rely on each other's skills and start to respect and admire one another more deeply.
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.
Their relationship can develop through shared experiences. For example, they can attend prenatal check - ups together in a Narnian - style way. This would bring them closer as they anticipate the arrival of their baby.
One possible fanfiction could be set in a magical forest. Caspian and Susan meet by chance while she is exploring. They start with a simple conversation, sharing their love for nature. As time passes, their connection deepens, and they go on adventures together, protecting the forest and its creatures. Their relationship blossoms as they face challenges side by side.
In many Prince Caspian fanfictions that don't involve the inappropriate pregnancy theme, they often focus on the adventures they could have together. Maybe they go on a quest to find a lost magical artifact. Their relationship can be portrayed as a deep friendship or a budding romantic connection. They might face challenges like dealing with new magical creatures or solving mysteries within Narnia.
One idea could be that Susan returns to Narnia during a time of great peril, and she and Prince Caspian have to team up to defeat a new, powerful enemy. They might discover hidden powers within themselves along the way.
One possible theme could be love and commitment. The pregnancy would force them to reevaluate their relationship and show how deeply they care for each other. Another theme might be the impact on Narnia. As Caspian is a prince, there could be political implications of this union and the upcoming child. Also, there could be a theme of sacrifice, like Susan might have to sacrifice some of her own desires or plans for the sake of the baby and Caspian.
One idea could be that Susan returns to Narnia in a time of great need, and she and Prince Caspian have to work together to defeat a new, powerful enemy. Maybe they discover an ancient magic that only they can unlock through their combined efforts.
In this fanfiction, they could go on a journey across Narnia to discover hidden secrets of the land. Since they are now married, they have a deeper connection and can communicate without words in some magical ways. Along the journey, they find ancient spells and artifacts that help them better understand the history of Narnia and how to protect it for future generations.
It could be a jealous sorcerer who was once in line for the throne of Narnia. Now that Prince Caspian has married Susan, he sees his chance of power slipping away. So he tries to create chaos and turn the Narnian people against the new couple.