You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of fanfics there. Just use the search function and type in 'Jacob x Rosalie' to see the available stories.
One common theme is the exploration of their relationship in an alternative universe. Since they are from different 'sides' in the Twilight series, fanfics often create scenarios where they can interact more freely.
You can try fanfiction websites such as Archive of Our Own (AO3). It has a vast collection of Twilight fanfictions, and you can easily search for Jacob and Rosalie - related ones using the search bar. Just type in 'Jacob and Rosalie Twilight' and you'll get a list of relevant stories.
I really like 'A New Dawn for Jacob and Rosalie' in the world of jacob black and rosalie hale fanfiction. It starts with a very interesting premise where Jacob and Rosalie are forced to work together on a mission that could save their respective clans. As they spend more time together, their relationship evolves in a very engaging way. There's also 'Moonlit Meetings' which is full of intense emotions and great character development for both of them.
Perhaps a plot where Jacob and Rosalie are forced to go on a journey together. During this journey, they face various challenges that test their limits. They might have to rely on each other's unique abilities to survive. For instance, Rosalie's super strength and speed could help in some situations, while Jacob's ability to transform into a wolf gives them an edge in others. Along the way, they develop a friendship that was unthinkable at the start.
Their relationship could start off rocky. Jacob has always had a bit of a temper, and Rosalie is not one to back down easily. But as they interact more, they might find common ground. Maybe it begins with a grudging respect for each other's loyalty to their own kind. As time passes, they could start to see the good in each other beyond their species differences. For example, Jacob might admire Rosalie's fierce protectiveness of her family, and Rosalie could come to appreciate Jacob's straightforwardness.
One interesting fanfiction could be about Jacob and Rosalie forming an unlikely alliance to protect the Cullen family from a new threat. They put aside their differences and use their unique abilities to fend off the danger.
Jacob's family might be initially shocked, especially if it was unexpected. But they would likely come around and be supportive. His parents might offer their wisdom on raising a child. Rosalie's family, depending on their nature in the fanfiction, could be either overjoyed or a bit more reserved. If they are more traditional, they might have concerns about the relationship between Jacob and Rosalie.
One great Rosalie Hale pregnant fanfiction could be 'Rosalie's New Beginning'. It focuses on how Rosalie deals with her pregnancy in the vampire world. The story beautifully portrays her fears and hopes.
One great Emmett and Rosalie pregnant fanfiction is 'A New Beginning'. It beautifully portrays their journey into impending parenthood, exploring their fears and joys. Another one could be 'Expecting Miracles' which focuses on how the Cullen family reacts to the news of their pregnancy.
You can start by looking on fanfiction.net. It has a large collection of fanfictions, and you're likely to find many stories about Jacob Black and Rosalie Hale there. Another good place is Archive of Our Own (AO3). It has a very user - friendly interface and a wide range of fan - created content, including some great pieces involving these two characters.