A great topic would be their relationship development from a more emotional and psychological perspective. How they communicate their feelings, deal with their differences, and grow as a couple without involving sexual content.
You could write about their adventures together. For example, they could go on a quest to retrieve a powerful artifact that was lost long ago. This would show their skills as demigods and how they work as a team.
A great topic could be their adventures together. For example, exploring a new, uncharted area in their world and how they work as a team to overcome obstacles. This would stay true to their relationship in the original story as comrades and friends.
A great topic could be how they help each other grow as individuals. Maybe Gwen helps Ben understand his powers better, or Ben teaches Gwen some self - defense skills. It would be a story about friendship and mutual improvement.
You could write about their adventures in the hospital. For example, how they work together to solve a difficult medical case. This would show their professional relationship and how they complement each other in their work.
They could focus on their mentorship relationship. For example, Clary learning important skills from Luke like how to handle different magical situations or how to understand the world of shadowhunters better. This would be a positive and character - building exploration.
One popular Bella and Edward first time fanfic might be those that focus on their emotional connection deepening. For example, some fanfics might describe their first time as a very tender and loving moment, with a lot of dialogue about their feelings for each other. They might be in a secluded, beautiful place like a forest clearing. Another type could be where it's a more unexpected first time, perhaps during a moment of danger or high emotion when they realize how much they truly need each other.
You could write about their adventures together, like exploring new planets or solving mysteries in the Star Wars universe.
You could write about their daily life adventures, like how they go on a picnic together and share their dreams and stories during that time.
One could write about their adventures together. For example, how they team up to fight a powerful new villain that threatens their land. This would focus on their camaraderie and combat skills.
A great topic could be how they help the people of Arendelle during a difficult winter. They could use their skills and knowledge to find solutions to food shortages or keep the villagers warm. It would show their kindness and leadership qualities. Also, you could write about how they celebrate their wedding anniversary in a very sweet and romantic way, like having a special dinner with all their friends and family from Arendelle and the trolls.