Explore their family backgrounds. If Marianne learns about Colonel Brandon's difficult past, she might start to see him in a new light. And Colonel Brandon could understand Marianne's family - influenced behavior better. This mutual understanding would be a great way to develop their relationship further.
Another way is through family interactions. If Marianne's family invites Colonel Brandon for dinner, Marianne can observe how he behaves around her family members. If he is polite, engaging, and shows genuine interest in them, it would endear him to Marianne. And also, Colonel Brandon can get to know Marianne better by seeing her in a family environment, which can help in deepening their relationship.
One idea could be a story where Colonel Brandon and Marianne go on a journey together through the countryside. They could encounter various characters along the way and their relationship could deepen as they share new experiences.
Redemption is also a theme. Colonel Brandon might be shown redeeming himself further in the eyes of Marianne or the community around them. It could be about him overcoming past traumas or misunderstandings. For example, a fanfic might show how he deals with the lingering effects of his previous heartbreaks and how that affects his new relationship with Marianne.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including those related to Marianne and Colonel Brandon. Just search for their names in the search bar, and you'll get a list of relevant stories.
One idea could be that Colonel Brandon takes Marianne on a tour of his estate, showing her all the places that hold special meaning to him. As they walk through the gardens and old halls, Marianne begins to see him in a new light, realizing his depth of character and his true feelings for her.
Well, they would have to communicate more. Marianne might have different needs and concerns during her pregnancy, and Bog King would need to be more understanding. For example, if she has mood swings, he would have to be patient. And they would start making plans for the future, like how to raise the child in their unique world which has its own set of rules and challenges.
In a realistic 'Girl Meets World' Riley - Brandon fanfiction, they would have to deal with insecurities. Riley might be insecure about her looks or intelligence compared to other girls Brandon might be interested in. Brandon could be insecure about fitting in with Riley's group of friends. By being honest with each other about these insecurities and supporting one another, their relationship can grow in a believable way. They would also have to navigate the social hierarchies at school, which can sometimes put pressure on their relationship.
You can develop their relationship by exploring their different perspectives. Ahsoka is younger and more idealistic in some ways, while Anakin has seen more of the galaxy's harsh realities. By having them debate about Jedi teachings, or how to deal with the Sith, their relationship can grow as they learn from each other. For instance, Ahsoka might suggest a more peaceful solution to a problem, and Anakin could initially be skeptical but then come around to see her point.
Their relationship can be developed through shared experiences in the medical field. For example, they could work together on a difficult medical case that requires both of their skills. This would force them to communicate, trust each other, and learn from one another.
Their relationship can be developed through shared experiences like going on missions together. When they face difficulties side by side, they'll learn to trust and rely on each other more.