There are several interesting plotlines in such fanfiction. For example, a plotline where Renesmee and Jacob are separated by some external force, like a powerful enemy who wants to keep them apart. Then they have to fight against all odds to be together. Another plotline could be that they try to blend their two different worlds - the vampire world of Renesmee and the werewolf world of Jacob. They might start a new community or way of life that is inclusive of both species. Also, there could be a plotline where Renesmee's love for Jacob causes a rift within her own vampire family, and she has to navigate through family politics to be with him.
One interesting plotline could be them facing opposition from the vampire and werewolf communities. Another could be Renesmee struggling with her half - vampire nature while in love with Jacob. And there might be a plotline where they have to keep their relationship a secret at first.
Well, a great plotline might be that Renesmee discovers a new power within herself because of her love for Jacob. Or perhaps they go on a journey together to find a way to make their relationship acceptable to both their families. There could also be a plotline where Jacob has to prove himself to the vampires in order to be with Renesmee. In some fanfictions, they might also have to deal with a threat that is specifically targeting their relationship, which adds an exciting layer of drama.
One interesting plotline could be Renesmee's journey to understand her dual nature, with Jacob being her guide. He could help her come to terms with both her vampire and human - like sides, and in the process, their relationship deepens.
Another plot might involve Renesmee developing special powers that only Jacob can understand. Since he has his own unique connection to the werewolf world, he helps her control and master these powers. It could lead to a deep bond forming between them as they rely on each other in ways no one else can.
A common plotline could be Jacob teaching Renesmee about the wolf pack and their ways. Renesmee, being curious, wants to learn more about the world around her. Jacob takes on the role of teacher, sharing the traditions, values, and powers of the pack. This can lead to interesting adventures as Renesmee tries to understand and maybe even incorporate some of those elements into her own life.
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.
A possible plot is that Renesmee gets into trouble with some vampires who don't trust her because of her unique nature. Jacob steps in and tries to make peace between them. He uses his relationship with Renesmee and his standing among the Quileute to negotiate a truce, all while their bond grows stronger in the face of the conflict.
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.
One possible reason could be that Renesmee simply has different interests. Maybe she is more drawn to a different lifestyle or set of values that Jacob doesn't align with. For example, she might be interested in exploring the world in a more solitary way while Jacob is more about the pack and community.
One interesting story could be about their adventures together in the forest. They might discover a hidden magic within the woods that only they can access because of their unique bond. In this fanfiction, Renesmee's special powers could be enhanced by Jacob's wolf abilities, leading them to face and overcome some dark forces threatening their family and the vampire - werewolf peace.
One interesting plot idea could be Jacob teaching Renesmee about the werewolf culture. Since she's part vampire and part human, she might be curious about the werewolves. Jacob could show her how they communicate within the pack, their traditions, and how they protect their territory. This would create a unique bond between them as she learns more about his world.
Perhaps a story where Renesmee gets into some trouble with a group of vampires who don't accept her existence, and Jacob has to fight to protect her. This could involve some intense battles and also show the depth of Jacob's love for Renesmee as he risks his life for her.