One possible plot could be that Arthur and Gwen face challenges in raising their baby in a world filled with political intrigue. Maybe there are those who see the baby as a threat or a tool for power. For example, some nobles might try to use the baby's influence to gain more land or favors. Arthur and Gwen would then have to protect their child while also ruling Camelot fairly.
Perhaps in the fanfiction, the birth of the baby is a symbol of hope for Camelot. The people of Camelot are overjoyed, and Arthur and Gwen have to deal with the public's high expectations. They also have to ensure the baby's safety from outside threats such as invasions or dark magic. At the same time, they are teaching the baby the values of justice and kindness that Camelot stands for.
In a fanfiction, it could be that an evil sorcerer casts a spell on Gwen and Arthur's unborn baby. The baby starts to show strange and dangerous symptoms. Merlin is the only one who can sense what's really wrong. He has to race against time to break the spell. He delves deep into his magic knowledge and also consults ancient magical texts. Along the way, he has to hide his actions from those in Camelot who still distrust magic, all while trying to save the baby and ensure the future of Camelot's royal family.
The antagonists could be forces of dark magic. They might sense the power within the baby and want to either corrupt it or use it for their own evil purposes. For example, there could be a sorcerer who wants to steal the baby and raise it to be his minion. Also, some neighboring kingdoms that see Camelot's new heir as a future threat might send spies or assassins to target the baby.
Well, it could be about how Ben and Gwen adjust to their new roles as parents. Maybe they face challenges like protecting the baby from villains who might want to use the baby's special powers (assuming in the fanfic world the baby has some).
The baby could be a key to uniting two warring factions in the Arthurian world. Arthur and Gwen would then have to navigate the political and social implications of this. They could have to protect the baby from those who would use it for their own gain. Or perhaps the baby has a unique connection to the magical elements of the land, like being able to make plants grow instantly or control the weather. This would attract the attention of both good and bad forces, and Arthur and Gwen would have to be vigilant.
In this type of fanfiction, it could start with Merlin having a prophetic dream where he sees himself kissing Arthur instead of Gwen. This dream haunts him and makes him realize his deeper, unacknowledged feelings for Arthur. As he tries to avoid this fate, circumstances keep pushing them together. Eventually, during a magical incident where emotions are heightened, Merlin accidentally kisses Arthur. This sets off a chain of events where they have to face the reactions of their friends and the court, and also explore their own feelings which they had previously buried deep inside.
Well, one possibility could be that the baby inherits some of Ben's alien powers in a really unique way. Maybe it's not as straightforward as having the Omnitrix, but has some latent abilities that start to show as it grows. And Gwen could be teaching the baby how to control any magical tendencies it might have, since she has her own magic skills.
The main plot could be about how Peter and Gwen adjust to their new life as parents. They might face challenges like protecting their baby from super - villains who could target their family. Also, they could be dealing with normal parenting issues such as sleepless nights and diaper changes while still being superheroes on the side.
Well, perhaps in the fanfiction, Peter and Gwen find an abandoned baby with some sort of special powers. They decide to take the baby in and raise it as their own. As they do so, they have to face various challenges. Enemies might be after the baby because of its powers. Peter uses his skills as Spider - Man to keep the baby safe, while Gwen provides the emotional support and care. They grow together as a family in the face of these difficulties.
One possibility is that the fanfiction focuses on the pregnancy journey. Gwen could be dealing with all the physical and emotional changes, while Trent is trying his best to support her. Then, when the baby arrives, it's all about the joys and fears of new parenthood.
The baby could have Ben's adventurous spirit. Since Ben is always eager to jump into action and explore new things, the baby might show signs of that same enthusiasm from a very young age. Maybe it would constantly be trying to reach for Ben's Omnitrix - like a shiny object that fascinates it.