The fanfiction could center around the cultural differences between Issei and Serafall. Since they come from different backgrounds in the supernatural realm, there could be humorous and touching moments as they try to blend their cultures, for example, in their wedding preparations. Serafall might introduce Issei to her unique magical traditions, and Issei could share his human - like values with her.
In this fanfiction, their marriage could be a political move in the supernatural world. Issei, being a unique character, and Serafall, with her own status, might marry to unite different factions. However, as they spend time together, they develop real feelings for each other. They face opposition from some who don't approve of their union, but they fight for their love and in the process, change the views of many in the supernatural community.
Issei would likely become more confident and responsible. Marrying Serafall, a powerful figure, would force him to step up. He might learn new magical abilities or gain more respect in the supernatural hierarchy. For Serafall, she could become more in - touch with the human side of things through Issei. She may soften her more flamboyant and sometimes self - centered ways.
One possibility is that there would be a great deal of conflict within the story's world. Other characters might be shocked and try to interfere. For example, some might think it goes against the natural order or the rules of their society.
They could have a very unique honeymoon. Maybe they would travel to different realms within their supernatural world. Issei would be excited to explore new places with Rias by his side. It could be a time for them to strengthen their bond further away from all the chaos and politics of their normal lives.
Well, the plot could involve Issei having to overcome many challenges to prove himself worthy of Sona. Maybe he has to battle powerful demons who oppose their union. He might also need to gain the approval of Sona's family or her peerage. It could also include some sweet moments of them getting to know each other better on a more personal level, like sharing their dreams and fears.
The pregnancy in the fanfiction could also bring about a new era for their group. It could be a symbol of hope and new beginnings. Issei and Rias' relationship could become an example for other characters. The story could explore how they prepare for the baby, like setting up a nursery in their supernatural abode. There might be a time when Rias' powers are affected by the pregnancy, and Issei has to step up even more to protect her. And as the due date approaches, the excitement and nervousness among the entire group would be palpable.
I haven't actually read a specific fanfiction with this plot. However, if such a fanfiction exists, it would likely involve a lot of creativity in terms of how the relationship between Issei and Serafall developed to that point. It could explore different aspects of their personalities and how they would handle the situation of a pregnancy, which might be quite different from the original storylines of their respective characters.
One possible storyline could be that Naruto realizes his feelings for Ino later in life. Maybe after all the chaos and battles, he sees Ino in a new light. They start off as friends who have always been there for each other during the tough times in Konoha. Ino, with her strong - willed and confident personality, helps Naruto deal with the pressures of being a hero. As they spend more time together, their relationship deepens and they eventually fall in love and get married. It could also involve their friends' reactions, like Sakura being a bit surprised at first but then being happy for them.
In a Naruto marries Tsunami fanfiction, perhaps there is a prophecy that Naruto's union with Tsunami will bring great peace. Naruto initially dismisses it, but as he gets to know Tsunami better, he realizes she has qualities he admires. Tsunami, who has seen Naruto's heroics, falls for him. They get married in a grand ceremony attended by all the ninja villages as a symbol of unity and hope for a more peaceful future in the ninja world.
One possible storyline could be that Hermione meets a Muggle through her work in the wizarding - Muggle relations department. They start as friends, with the Muggle being intrigued by her intelligence and her unique world. As they spend more time together, they fall in love. Hermione has to navigate the challenges of introducing her wizarding life to him while also dealing with the reactions of her wizarding friends, who might be skeptical at first. But in the end, they get married and she finds a new way to blend her two worlds.
One popular one might be those that explore their unique relationship dynamic in the context of the High School DxD universe. For example, some fanfictions focus on how Issei's pervy nature interacts with Serafall's more flamboyant and powerful self. It could lead to some really interesting and comical situations, like when Issei accidentally makes a fool of himself in front of Serafall and she teases him mercilessly.