Definitely not. Fanfiction based on such a description often delves into sexual and mature topics. 'Highschool DxD' already has some elements that are not for general family viewing, and this type of fanfiction would take it further into inappropriate territory not suitable for a wide range of audiences.
In some fanfictions, it could be a misinterpretation or an extreme take on Issei's character. The author might want to deviate significantly from the source material in terms of his sexual aspects. This could also be influenced by the overall tone or genre the fanfiction is aiming for, such as a more comical or angsty take on the story.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own. These platforms usually have a large collection of fanfictions, including those related to Highschool DxD. Just use the search function and type in 'Highschool DxD Kuroka pregnant' to see if there are any relevant stories.
The theme of sacrifice also often appears. Characters may have to sacrifice their own desires or goals to accommodate the pregnancy. For instance, a character might have to give up a certain opportunity in school or in their personal life to focus on the pregnancy and the future of the baby.
It might be related to his Sacred Gear. If there is some sort of malfunction or unforeseen side - effect of his Sacred Gear, it could lead to this situation. For instance, if his power is growing in an uncontrolled way, it could disrupt his normal bodily functions including sexual ones. Fanfiction authors often play with such concepts to create interesting plot twists.
The relationships in Highschool DxD are complex. When Kuroka is pregnant in fanfiction, it can lead to interesting interactions with other characters. It can also explore themes like family, loyalty, and how the other characters in the Highschool DxD universe react to this big change in Kuroka's life. It gives the author a chance to really dig deep into the characters' personalities and relationships.
Well, 'Unexpected Blessing' is another. It focuses on the relationship between the main characters when a pregnancy occurs. The author does a great job of showing the emotional turmoil and also how the events affect the relationships with other characters in the story. It's really engaging to read.
I'm not sure if there is specifically such a fanfiction. There are a vast number of fanfictions out there for Highschool DxD, and while some might explore different relationship developments for Akeno, it's difficult to say for sure if there's one about her being pregnant. You could try searching on some popular fanfiction websites.
It could explore the reactions of the other characters. For example, how would Issei, her friend or love interest, react to the news? It might also look into how Akeno herself copes with the situation, given her character traits in the original series. Maybe it would show her becoming more protective or having new fears.
An OC (Original Character) in a Highschool DxD fanfiction having the Rinnegan could be an extremely powerful and unique addition. The Rinnegan, from the Naruto universe, brings a whole set of abilities like the Six Paths powers. In the context of Highschool DxD, this OC could use these powers in various ways. For example, the ability to see chakra could be translated into seeing the magical energy in the DxD world. They could use the gravitational powers of the Rinnegan to manipulate the environment during battles against devils, angels, or fallen angels. It would make for a very interesting and overpowered character in the Highschool DxD fanfiction setting.