Well, in fanfiction, anything can happen. Maybe a plot device like a prophecy forces Hermione and Draco together. They might start off hating each other but as they get to know each other better due to the prophecy's demands, they fall in love. And then, with the help of some fictional magic related to fertility in the wizarding world, they could give birth. It's a very common trope in fanfiction to take two unlikely characters and make them a couple with a family.
One common theme is the unexpected nature of their relationship leading to this moment. It often involves them overcoming their past differences. Another theme could be the challenges they face during the pregnancy, like how the wizarding world reacts to their union.
One possible plotline could be that Voldemort gives Hermione to Draco as a way to test Draco's loyalty. Draco, who has his own complex feelings towards Hermione, might initially be conflicted. He could be ordered to torture her for information, but instead, he tries to protect her in secret. This could lead to a series of events where they form an unlikely alliance against Voldemort.
There are some fanfictions out there. You could try looking on fanfiction.net. Search for the tags 'Draco', 'Hermione' and 'giving birth'. Some stories might be really well - written with interesting plot twists and character developments.
One possibility could be through some sort of time - traveling or alternate universe scenario in the fanfiction. Maybe a spell gone wrong sent Hermione back in time and through a series of complex events, she ended up in a situation where she was related to Draco in that way. It's a very creative and out - of - the - box concept that fanfiction often explores.
Perhaps Draco has been betrayed by those he thought were his friends or allies. They left him when they found out about his pregnancy, leaving him with no choice but to give birth alone. It could also be that Draco has some sort of unique magical ability related to his pregnancy that he doesn't want anyone to discover, so he isolates himself for the birth. In the story, his struggle during the birth could lead to self - discovery and newfound strength.
If we consider this fanfiction idea, it might also involve other characters' reactions. For example, his friends would be extremely shocked at first. They might try to find a way to reverse the situation. And Harry himself would have to go through a physical and emotional journey. He would need to adapt to the idea of giving birth, which is something completely alien to him, all while being in a world full of magic and mystery.
One possible plotline could be that Draco kidnaps Hermione due to some dark family obligation related to her birth. Maybe there's a prophecy that involves her and his family wants to control the situation. Another could be that he's misinformed about her birth and thinks she's a threat to the wizarding world as he knew it. So, he takes her to figure out the truth.
Common themes include the exploration of identity. Their child represents a new identity that combines the traits of both Hermione and Draco. It also questions the established norms of the wizarding world. Another theme could be the journey of self - discovery for both characters. As they enter into a relationship and have a child, they learn more about themselves. And sometimes, there is a theme of sacrifice. They might have to sacrifice their previous beliefs or relationships to be together and raise their child in the fanfiction.
There are also fanfictions that focus on Hermione's strength during childbirth. She might use her intelligence and knowledge of magic to make the process as smooth as possible. Her friends, like Harry and Ginny, could be there to offer their support and assistance throughout the whole experience.
I'm not sure if there is such a specific fanfiction. Fanfiction covers a wide range of ideas, but this combination seems rather unusual. It might exist in the vast realm of fan - created works, but it's not a common or well - known trope that I'm aware of.