Perhaps the baby has some unique powers that Bella and Edward have to figure out how to handle. It could be something like the ability to communicate telepathically with other vampires or werewolves at a very young age. This would create a whole new set of challenges and adventures for the family.
One idea could be exploring how Bella and Edward adjust to the new addition in their family. Maybe they struggle with protecting the baby from the vampire world's threats.
Another plot could revolve around Bella, Edward and Renesmee going on a journey to discover more about Renesmee's origins. They could meet other hybrids or ancient vampires who have knowledge about her kind. This would not only be an adventure but also a way for the family to bond more.
The baby would also be a significant character, even if it might start as a newborn. Its presence changes the dynamic between Bella and Edward and influences the actions and decisions they make throughout the fanfiction. And depending on the plot, other characters like Jacob or members of the Cullen family could also play important roles. For example, Carlisle might be involved in providing medical knowledge about the unique situation of the baby. Or Jacob could be there to offer protection from the werewolf side, given his connection to Bella and his pack's loyalty.
One idea could be that Edward is a criminal on the run and Bella, a journalist, is trying to expose his crimes but ends up falling in love with him. Another could be Edward as a criminal mastermind who recruits Bella into his world of crime. Maybe Edward is wrongly accused of a crime and Bella helps him prove his innocence while they face many dangerous situations together.
One interesting plot idea could be a love triangle where both Edward and Emmett are vying for Bella's attention in a more complex way than in the original story. Maybe there are external forces at play that make Bella question her feelings for both of them.
Well, perhaps in this fanfiction, the shower is a place where they find a magical or symbolic element. It could be that the water has some sort of special property that helps Edward control his thirst for Bella's blood in a new way. Or, the plot could revolve around them getting into an argument in the shower, which then leads to a passionate reconciliation as they realize how much they mean to each other and how they need to communicate better.
Perhaps in the fanfiction, Bella is also in prison for some unjust reason. Edward, being a vampire, has to use his special abilities secretly to protect her from the other inmates. He could be using his mind - reading skills to anticipate threats.
A plot could involve Renesmee's love life. Since she is a special being, finding a suitable partner would be difficult. It could be a story of her falling in love with a human who is initially afraid of her but gradually comes to accept her. Edward and Bella would be there to guide her through this new experience, while also being protective. Or perhaps a plot where Renesmee discovers a hidden power within herself that has been passed down from an ancient vampire ancestor, and she has to learn to control it with the help of Edward and Bella.
Maybe a plot where Renesmee has to face some sort of vampire - human conflict that her parents once faced, but in a different context. Since she is part - vampire and part - human, she could be a bridge between the two worlds and strive to bring peace. She could use her understanding of both sides to defuse tense situations.
Well, perhaps in the fanfiction, the baby project is a part of a bigger magical experiment. Fred and Hermione might find that the baby they are dealing with has a connection to an ancient prophecy. They then have to figure out how to raise the baby while also fulfilling the prophecy's requirements. This could lead to a lot of character development for both Fred and Hermione as they face challenges they never expected.
One possible plot could be about the challenges of raising a baby in the world of Jacob and Bella. Maybe the baby has some special powers that they have to protect it from the wrong people.