Another theme is the growth of the relationship. The pregnancy can either strengthen or test the bond between Sirius and the OC. Sometimes it shows how they come closer together, learning about each other on a deeper level.
Themes of secrecy and discovery are also common. In the wizarding world, there could be reasons to keep the pregnancy a secret, and then the story might revolve around how that secret is either kept or eventually discovered. Additionally, themes of love and sacrifice might play a big part, as Sirius might have to make sacrifices for the well - being of the pregnant situation and the future of the child.
Love and friendship are also big themes. The OC and Sirius usually start as friends or strangers and then develop a deep romantic relationship. Their love story might be set against the backdrop of the wizarding world's turmoil, like the fight against Voldemort. It adds an element of danger and excitement to their relationship.
One common theme is forbidden love. Since Sirius has his own complex situation within the wizarding world, often the relationship with the OC is something that is not easily accepted. For example, in many stories, his family might oppose it.
Love and friendship are also common themes. The OC often forms a deep bond with Sirius, whether it's a romantic love or a strong friendship. This bond helps to develop both characters and drive the story forward. They might go through challenges together and their relationship grows stronger as a result.
One common theme is acceptance. Jacob has to accept the OC and the fact that she is pregnant. This could involve accepting her into his life, his pack if relevant, and the new responsibilities that come with it. Another theme is protection. Jacob is often portrayed as being very protective of the pregnant OC, shielding her from any threats, whether it's from other supernatural beings or just the normal difficulties of pregnancy in a sometimes hostile world.
Love is a very common theme. The love that develops between Sirius Black and the OC can range from a slow - burning romance to an instant attraction. Another common theme is redemption. Sirius may find redemption through his relationship with the OC.
One common theme is redemption. Often, Sirius has had a rough past, and the OC can play a role in his redemption. For example, in some fanfictions, the OC helps Sirius come to terms with his family issues and his time in Azkaban. Another theme is love and acceptance. The OC may be an outcast in some way, and Sirius and the OC find solace in each other's company, accepting each other's flaws.
Love and Romance are very common. Since it's about Sirius Black and an OC, the development of their relationship, from the first meeting to falling in love, is often a central theme.
The theme of freedom is quite important too. Sirius was locked up in Azkaban for a long time, and when he escaped, he was fighting for his freedom. Fanfictions often expand on this, showing his journey to fully regain his freedom and his place in the wizarding world, while also dealing with the prejudice against him because of his supposed crimes.
One common theme is the exploration of their relationship in a new light. With the pregnancy, they have to reevaluate their feelings and commitment to each other.