One possible plotline could be the initial shock and confusion among the family and friends. They might struggle to accept the situation at first. Another could be George and Fred's journey in dealing with this unexpected event, perhaps with Fred stepping up to support George in every way. And there could also be a plotline about how they face the wizarding community's reactions, if it's set in a magical world like in the Harry Potter universe.
In this fanfiction, George would develop in many ways. Physically, he'd have to deal with the pregnancy symptoms which would make him more in tune with his body. Emotionally, he might experience mood swings which could affect his relationships. But through it all, he could become stronger. Fred would develop his caregiving skills. He'd be learning how to take care of a pregnant George, like cooking special meals or getting him comfortable. Their friends could also develop. For example, Hermione might use her knowledge to help with any magical or non - magical problems, and Ron could offer his loyalty and support, showing how they all grow and change in this unique situation.
I'm not sure specifically about a 'George pregnant with Fred baby' fanfiction. It's a rather unusual concept and might not be very common. You could try searching on major fanfiction websites like Archive of Our Own or FanFiction.net.
It would be a very strange and unique take. It might involve some sort of magical or alternate - universe scenario to make it possible. Maybe in a world where gender roles and biological functions are different in the context of that fictional universe.
One possible plotline could be that they accidentally end up in a situation where Hermione gets pregnant, and then they have to deal with the reactions of their friends and family. Maybe they initially keep it a secret and struggle with how to break the news.
There are likely some out there. You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. Just search for 'Fred and George pregnant' in their search bars and browse through the results. Some might be really well - written and capture the essence of the characters in an interesting pregnancy - related storyline.
One common theme could be the shock and adjustment of becoming fathers. Another might be the support they get from their family and friends. Also, the anticipation and excitement of the new arrival.
You can start by looking on fanfiction websites like Fanfiction.net or Archive of Our Own (AO3). Just search for 'baby Fred and George' in the search bar and you'll get a list of relevant fanfictions.
One great baby Fred and George fanfiction is 'The Twins' Early Adventures'. It shows their mischievous nature even as babies in a really cute way. Another one could be 'Baby Fred and George's Magic Pranks' which focuses on the little magical things they do that foreshadow their future as pranksters at Hogwarts.
Some fanfictions show that Hermione might be a bit worried about how this will affect her studies or her work in the wizarding world. George tries to reassure her by saying that they will figure it all out together. He often makes her laugh with his silly jokes to ease her concerns.