The implications would be significant. First, it would change the entire perception of the characters. Jacob and Renesmee's relationship has certain boundaries in the original. This fanfiction concept would break those boundaries and create a whole new set of relationships and family dynamics. It might also face a lot of criticism from the fan community for straying too far from the source material. Additionally, it could raise ethical questions about the nature of the relationship depicted in the fanfiction, as Renesmee has a unique origin in the original story.
I'm not sure if there is a specific 'Jacob gets Renesmee pregnant' fanfiction. Fanfiction can cover a vast range of ideas, but this is a rather controversial and unusual plot. It might exist in some corners of the fanfiction world, but it also goes against some of the original concepts in the source material. You would need to search through various fanfiction platforms like Archive of Our Own or FanFiction.net to find out for sure.
One possible plot could be the challenges they face in their relationship due to the unexpected pregnancy. For example, how they deal with the reactions from their families and friends in the Twilight universe. Another plot might involve the preparations for the new life, like finding a safe place to stay.
It could include how the other characters react. For example, Bella and Edward might have mixed feelings. Also, it could show how Jacob and Renesmee prepare for the new arrival. Maybe they would have to deal with the differences between their species while raising a child.
One possible plot could be the challenges they face as a young couple expecting a baby. Maybe they struggle with telling their families, especially considering the unique nature of their relationship in the fanfiction world. Another could be how they prepare for the baby, like finding a place to live and getting things ready for the new arrival.
If such a fanfiction existed, it would likely stir up a lot of controversy among fans. Some might see it as a creative exploration of the characters' relationship, while others would think it's completely out of character and against the essence of the original story.
It would be a very strange and unique take. Given their different natures in the 'Twilight' world, it would require a lot of creative liberties. Maybe it could involve some sort of magic or supernatural force that overrides their normal biological limitations. But overall, it would be a very different kind of story from the original series.
Another reason could be to protect her from a prophecy. In the world of fanfiction, there could be a prophecy that foretells Renesmee's doom if she stays with the Cullens. So Jacob, thinking he's doing the right thing, kidnaps her to keep her away from that fate.
One of the main supporting characters could be Bella. As Renesmee's mother, she would likely be very involved in the pregnancy, offering advice and support. Another could be Edward. He might have some concerns about the situation but also be there to help protect the family. Alice could also be a key supporting character, perhaps using her gift to foresee any potential problems during the pregnancy.
The implications would be quite complex. Firstly, in the context of the Bleach world, where there are strict social structures and hierarchies, this would be a major scandal. Byakuya, being a noble, would have his reputation at stake. Rukia, too, would face a lot of scrutiny. Emotionally, it would add a whole new layer to their relationship. They would have to navigate not only their existing feelings of respect and family - like connection but also the new dynamic of being about to have a child together. This could also lead to changes in their relationships with other characters. For instance, Renji might have a very different reaction compared to Ichigo, and the Soul Society as a whole would have to deal with this unexpected development.
The plot could take a very different turn. If Harry gets Narcissa pregnant, it might change the power dynamics in the wizarding world. The Malfoy family's reputation would be forever altered. And Harry, being the father, would have new responsibilities. He might face opposition from those who oppose any form of 'forbidden' relationships. There could be a lot of secrecy involved at first, with the two trying to figure out how to handle this unexpected situation.