In these fanfictions, a recurring theme is the change in their relationship. The pregnancy can bring them closer together or create new tensions. Also, the theme of protecting the unborn child from potential threats in the wizarding world, whether it's dark wizards or the prejudiced views of others, is quite common. Additionally, there may be exploration of how Hermione's academic life is affected and how Sirius adapts to the idea of becoming a father, which are all interesting aspects that authors like to explore.
A big theme is the exploration of Hermione's character growth. With Sirius as her guardian, she might be exposed to different aspects of magic and life that she wouldn't have otherwise. For example, she could learn more about the darker side of magic and how to combat it. Also, the theme of loyalty often comes up, as Sirius is loyal to Hermione and she to him in return.
One common theme is redemption. Sirius has had a troubled past, and Hermione could be seen as the one to help him fully redeem himself. Another theme is the power of love across different generations. Since they are from different age groups in the original series, the fanfictions might explore how love can bridge that gap.
Some fanfictions might explore the magical world's reaction to such an unusual pairing. For example, how would the other characters like Harry or Ron react? Or what about the wizarding society's views on this relationship? This adds an extra layer of complexity and drama to the story, making it more interesting to read.
Protection is also a big theme. Given Sirius' nature, he feels a sense of responsibility to keep Hermione safe. This could be from dark wizards or from the general dangers that lurk in the wizarding world. Sometimes, it's about protecting her reputation or her place at Hogwarts too.
There are quite a few out there. Some might be found on popular fanfiction websites like Archive of Our Own. You can search for specific tags related to Sirius and Hermione and pregnancy to narrow down the results.
Often, there could be themes related to acceptance. Lucius may need to accept Hermione in a new light, and she may have to come to terms with the Veela side of things during the pregnancy. Also, there might be a theme of facing the judgment of the wizarding world. Their relationship is not a typical one, and with a pregnancy involved, they would likely face a lot of scrutiny from others.
One common theme is mentorship. Sirius can be seen as a mentor to Hermione, guiding her with his more worldly wizarding knowledge. Another theme is the idea of family. Since Sirius is an outsider in his own family, and Hermione has Muggle - born status, they form a kind of surrogate family for each other.
One common theme is the idea of mentorship. Sirius, being an older and more experienced wizard, can guide Hermione in different aspects of the wizarding world. For example, in many fanfics, he helps her understand the Marauders' era better.
One common theme is the exploration of an unconventional friendship. Sirius and Hermione come from different generations in the wizarding world, so their friendship defies the norms.
Family relationships are also a big theme. These fanfics usually show how Hermione and Sirius interact with their daughter, and how the family dynamic works. It could be a loving and nurturing environment or one filled with challenges as they try to protect her from the dangers of the wizarding world. Magic and power is another common theme. Their daughter is often depicted as having strong magical abilities, and the fanfics explore how she uses and controls her power.