Maybe Castle realizes he can't live without Beckett and confesses his love at the last minute, which stops the wedding. For example, he could show up with some big revelation about their relationship that makes Beckett question going through with the wedding.
The main characters are Castle and Beckett, obviously. Castle is likely to be the one who intervenes in Beckett's wedding. Beckett is the one whose wedding is being stopped.
A Castle and Beckett baby fanfic could be about their journey into parenthood. It might explore how they adjust to having a baby in their lives. For example, Castle could be super excited and start writing new stories inspired by his new family experience, while Beckett might be a bit more cautious and protective.
In a fanfic where they have a baby, their relationship would shift. They would now be partners not only in crime - solving but also in parenting. Castle would likely become more domesticated, helping with diaper changes and midnight feedings. Beckett would have to learn to let Castle in more on the parenting front, and they would communicate more about family - related matters. This new aspect of their relationship would add a different layer of complexity and closeness to their bond.
Esposito and Ryan are very likely to be involved. They are Castle's friends and colleagues, and they would probably be there to support the couple. They might offer their own brand of humor and help out in practical ways, like throwing a baby shower for Beckett and Castle. Also, Martha, Castle's mother, would surely be a central figure. She could offer her wisdom on pregnancy and child - rearing, and add some comical moments with her unique personality.
There could be. The Castle fandom is quite creative, and a pregnancy plot for Beckett is a popular trope in fanfiction. Some fanfics might focus on the romantic aspect of it, with Castle being over - the - moon and taking extra care of Beckett. Others might explore the more practical and challenging sides, such as Beckett still trying to solve cases while dealing with pregnancy symptoms.
He could react with anger. After all, if he has feelings for Beckett, seeing her with someone else like Vaughn might make him furious. He might lash out at both Beckett and Vaughn without really understanding the situation.
One great fanfiction could be one where Beckett discovers Castle's pregnancy and they navigate the challenges together. It might explore how their relationship changes as they prepare for a new addition to their family.
One possible fanfiction could be about Castle and Beckett finding out they are having a baby girl. It might start with Beckett suspecting she's pregnant and taking a test. Then Castle's over - the - top excitement when he finds out. They could start planning the nursery, with Castle having all these wild, creative ideas and Beckett trying to rein him in a bit. Their friends would also be super excited, and there could be some comical moments as they all offer their parenting advice.