One common theme could be family dynamics. Since it involves a brother - sister relationship, even if one is an oc (original character), exploring how they interact within the family context can be a theme. For example, how they support or conflict with each other.
Romance - related themes might also be common. The 'lemon' aspect might imply a more romantic or even sensual undertone in their relationship, which could explore themes like forbidden love or the discovery of new feelings between them. However, this can be a controversial theme as it involves a brother - sister relationship in a non - traditional way. Another theme could be self - discovery. The characters might be on a journey to understand themselves better through their relationship with each other.
One common theme is family bond. Since Bella and Lemon are siblings, stories often focus on how they support and care for each other through different situations, like dealing with school problems or helping around the house.
I'm not sure about specific 'bella and her oc brother lemon fanfiction' but you can try searching on fanfiction websites like Archive of Our Own. They usually have a wide range of fan - created stories that might include what you're looking for.
One common theme is friendship. Many fanfictions explore how an OC can become a true friend to Bella. Another is adventure. The OC often gets involved in the exciting events that Bella experiences in the Twilight universe.
Love is a very common theme. It's about the deep, passionate love that develops between Bella and her oc wolf mate. Another theme is loyalty. The wolf mate is often shown to be extremely loyal to Bella. And there's also the theme of the supernatural. Since it involves a wolf mate, there are elements of the supernatural world like special powers or abilities that the wolf mate might have.
Friendship is a common theme. In many 'bella and lemon fanfiction' stories, Bella and Lemon form a strong bond that helps them get through various challenges. For example, they might support each other during a difficult time at school or in their family lives.
Family loyalty is a common theme. The brother will often go to great lengths to protect Bella, showing the strong bond of family. For example, he might face off against her enemies without hesitation.
One common theme is friendship. The OC often forms a unique bond with Bella, either helping her through tough times or just being a great friend. Another theme is the exploration of the supernatural world. Since the Twilight series has a lot of supernatural elements, the OC usually gets involved in that aspect too, like dealing with vampires and werewolves.
One common theme is friendship turning into something more. For example, they start as friends who support each other through difficult times in the story world, and then gradually develop romantic feelings.
Power struggles are also quite common. Lucifer and his brother often have different levels of power, and in the oc (original character) fanfictions, the oc might get involved in these power dynamics, either trying to balance them or being affected by them. For example, the oc could be a mediator between the two brothers in a power struggle. And sometimes, there are themes of redemption, where either Lucifer or his brother is on a journey to redeem themselves, and the oc plays a role in that journey.
Well, family is a huge theme. The OC brother becomes part of the Winchester family in a way. They go through the same struggles as a real family, like protecting each other from demons and other supernatural threats. Also, discovery is a theme. The OC discovers his own powers or his place in the world of the Winchesters. For example, in some fanfictions, the OC brother realizes he has a special ability that can help in their hunts, and it's all about how he comes to terms with it and uses it for the good of the group.