I'm not sure of specific fanfiction pieces where Selene is pregnant in the 'Underworld' universe. However, you can try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. There might be some creative works there that explore this concept.
A plotline could involve Selene's pregnancy causing a rift in the vampire community. Some vampires might see the child as a threat to their traditional ways or a potential source of power. So, Selene has to deal with not only the physical and emotional aspects of pregnancy but also the political turmoil within her own kind.
One possible fanfiction could be that Selene and Michael's pregnancy is a sign of hope for the vampire and lycan clans. Their child could be seen as a symbol of unity, bringing an end to the long - standing feud. Maybe in the story, they have to face many challenges during the pregnancy, like threats from those who oppose the union of a vampire and a lycan.
You can also try Fanfiction.net. There might be some interesting Underworld Selene OC fanfictions. Look for ones with high ratings and lots of reviews. These are usually a good indication of quality. They might offer unique takes on Selene's character, perhaps with an OC that has a special power or a different background.
Some fanfictions could explore the idea of Selene teaching Naruto about the secrets of the Underworld. Naruto, in turn, could show Selene his ninja way and how determination and hard work can overcome great obstacles. This could lead to a series of adventures as they explore different regions of the Underworld together.
A common theme is the relationship between Selene and the OC. It could be a friendship, a mentorship, or even a romantic relationship. For example, the OC might be a new vampire that Selene takes under her wing.
There could also be original characters created specifically for the fanfiction. These characters could be hybrids of the Naruto and Selene universes, perhaps having a mix of ninja abilities and Underworld powers. They could add new dimensions to the story and help drive the plot forward, whether as friends or foes to Naruto and Selene.
First, you need to understand the Underworld universe. Know the rules about vampires, werewolves, and the whole power dynamic. For the OC, create a unique backstory. Maybe they're a human with a special connection to the supernatural world. Then, think about how Selene would react to this new character. Their first meeting should be impactful and set the tone for their relationship.
One plot idea could be a male character who is a werewolf but has been raised among vampires. He meets Selene and they have to team up to fight a common enemy, like a new breed of super - natural creatures that threaten both vampires and werewolves. This would create a lot of tension and also a chance for a slow - burn romance between them.
There's this great fanfiction called 'Percy and Selene: A New Beginning'. In this story, Percy discovers Selene in a rather unexpected situation, and from there, they embark on a journey that changes their destinies. It has some really interesting plot twists and character developments. And then there's 'Percy and Selene in the Underworld', where they must navigate the dangerous realm of the dead together.
First, you need to understand the characters. Selene is a strong, complex vampire, so you should keep her personality traits consistent. For the male reader character, decide on his background, whether he's human, vampire, or something else. Then, create a plot that brings them together. Maybe it's a shared mission or an accidental encounter.