Their relationship would likely become more intense. With a baby on the way, they'd have to rely on each other more. Gale might become more protective of Katniss, and Katniss would have to trust Gale in new ways.
I'm not entirely sure if there is a specific 'Katniss and Gale make love' fanfiction. Fanfiction is a vast world with countless stories. Some might focus on their friendship, while others might explore a romantic aspect. It's possible that there are some stories that take their relationship to that level, but you'd have to search through popular fanfiction platforms to know for sure.
Another theme is the struggle with their different worldviews. Gale is more radical in his approach to the Capitol, while Katniss has her own way of dealing with things. Fanfictions often play with this contrast.
It would likely be a very emotional and complex story. Given their history and the difficult world they live in. It might start with the build - up of their long - standing relationship, the unspoken feelings they've had for each other. Then it could explore how such an intimate moment would change their dynamic, especially considering the political and social unrest in their world.
One plot idea could be that Gale and Katniss find out about the pregnancy during a time of relative peace in District 12. They then face the challenges of preparing for a new life while also dealing with the memories of the Hunger Games and the trauma they've endured. They might worry about how to protect their child from the potential threats that still lurk in Panem.
One great Katniss and Gale fanfiction is 'The Unspoken Bond' which delves deeper into their pre - Hunger Games relationship. It shows how they supported each other in the Seam and how their bond was more than just friendship at times.
In the fanfiction, if Gale and Katniss had a baby, it could be a symbol of hope. Their relationship, which was always complex, would evolve in new ways. Gale, who has always been a fighter, would now be fighting for his family. Katniss, with her motherly instincts, would be teaching the baby about survival and the importance of love in a world that has seen so much destruction.
There's also 'Gale's Hope in Katniss'. It explores how Gale holds on to his love for Katniss throughout all the chaos and hardships they face. It's a beautifully written fanfic that gives a different perspective on their relationship compared to what we see in the main series.
He may interact as an uncle - like figure. Teach the kid things like how to make a proper bowstring or how to find water sources in the wild. He would be respectful of Katniss and Peeta's parenting style and only offer advice when asked. He would also be a source of adventure for the kid, taking them on short hikes in the woods and showing them the secrets of the forest. This would help the kid develop a sense of independence and self - reliance.
The wedding ceremony could be described as a simple yet deeply meaningful affair. Set in the woods that they both love, with the trees as their natural cathedral. Katniss might wear a simple white dress, made from the finest fabric they could find in the district. Gale would be in his best hunting gear, looking strong and handsome. Their friends and family would gather around, and there would be a sense of both joy and solemnity in the air as they exchange vows under the open sky.