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.
Issei would most likely become more protective. He'd be constantly by Rias' side, making sure she was comfortable and safe. He might also start training even harder to ensure he could defend his family when the baby arrives. His character would grow in the sense that he'd become more selfless and family - oriented, thinking about the future of his family rather than just his own growth as a fighter.
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.
The story could develop with Issei forming his own group. He might gather other characters who also feel left out or have similar goals. This new group could then become a rival to Rias' peerage, leading to interesting battles and power plays.
One possible reason could be a desire for self - discovery. Issei might feel that being in Rias' peerage limits his growth in certain ways. He may want to explore his powers and identity on his own terms.
Well, in a general sense, it might involve Issei using some sort of special power or situation to hypnotize Rias. The plot could then revolve around how this hypnotized state affects their relationship, perhaps leading to some unexpected interactions or adventures within the fanfiction's universe.
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.
One idea could be a story where Issei and Rias have to go on a special mission together in a parallel dimension. In this dimension, they lose their powers and have to rely on their wits and the bond they've developed. They face challenges that test their relationship and force them to understand each other on a deeper level.
In fanfiction, if Issei and Rias have a baby, it could be a story full of new adventures. The baby might inherit unique powers from both of them. For example, Issei's boosted gear power and Rias' devil abilities. Their friends would surely be excited and protective. The story could focus on how they raise the baby in a world full of different species like devils, angels and fallen angels. It would also show how they balance their duties as leaders and parents at the same time.
A Rias and Issei wedding fanfiction could be full of grandeur. There would be various characters from the Highschool DxD universe in attendance. The wedding might take place in a magnificent location, perhaps a grand cathedral-like place in the Underworld. Rias would look stunning in a traditional yet unique wedding dress, and Issei would be in a sharp suit. Their friends would give heartwarming speeches, and there would be a sense of celebration not just for the couple but for the unity of different factions in the story.
Well, it could be that Rias betrays Issei for power. Maybe she is offered something extremely tempting, like a high - ranking position in the devil hierarchy, which makes her turn her back on Issei. It could also be that she is forced to betray him under some sort of blackmail or threat.