Redemption is also a theme sometimes. Demetri may have a dark past in some fanfictions, and through his relationship with Bella, he tries to find a way to redeem himself. This can add a lot of depth to the story and make the characters more complex and interesting.
One common theme is the exploration of forbidden love. Since Demetri is from a different world in the Twilight universe, their relationship often goes against the norms. For example, in many stories, they have to face opposition from other vampires or werewolves.
Love and obsession are also prevalent themes. Demetri's possessiveness is often intertwined with his love for Bella, but it can border on obsession. The fanfictions explore how this love - obsession spectrum affects their relationship and the people around them. For example, it can cause friction with Bella's human friends or other vampires who don't understand Demetri's extreme feelings.
Common themes in 'bella and demetri true mates fanfiction' include love conquering all. Their relationship is often depicted as so strong that it can withstand any external forces. Also, the theme of self - discovery is present. Bella may discover new aspects of herself through her bond with Demetri, and Demetri might also learn more about his own emotions and desires. There's also the theme of loyalty, as they have to be loyal to each other in a world full of different vampire politics and rivalries.
One common theme is protection. Demetri's possessiveness often manifests as a strong need to protect Bella from all kinds of danger in the Twilight - inspired world.
One great Bella and Demetri completed fanfiction is 'A Different Path'. It explores an alternate universe where Bella has a different encounter with Demetri. The story is well - written, with vivid descriptions of their relationship development.
Power dynamics could also be a theme. The Volturi are powerful vampires, and Bella is a human. Their relationship would involve a complex power dynamic. Demetri would have to protect Bella from other threats, but also control his own vampire instincts. And Bella would have to find a way to assert herself in a relationship where she is physically weaker but perhaps emotionally stronger.
One common theme is love. Often, the OC falls in love with Demetri or vice versa, and the story revolves around their relationship. Another theme is power. Since Demetri is a vampire with certain powers, the OC might have powers too, and their powers interact. Also, there's the theme of belonging. The OC usually has to find their place in the Twilight world.
In some fanfictions, Bella could be turned into a vampire by Demetri in a rather unorthodox way. This new vampire Bella then has to navigate the complex vampire society with Demetri as her guide. He teaches her how to use her new abilities and they end up having a deep bond that is more than just a typical vampire - human relationship.
I'm not sure who the absolute best is, but there are many talented authors out there. Some might be well - known in the Twilight fanfiction community for their unique take on Bella and Demetri's relationship. You could look for authors who have a lot of positive reviews and high ratings on fanfiction websites.
They could also be rivals in a competition within the vampire community, like a battle of wits or a race to find a powerful vampire relic. This would add an element of excitement and competition to their relationship, rather than focusing on something inappropriate.
One popular Demetri and Bella mates fanfiction might be 'Demetri's Redemption'. In this story, Demetri discovers a different side to his relationship with Bella. It delves into how their bond forms in a world filled with vampire politics. Another could be 'Bella's Choice', where Bella has to navigate her feelings for Demetri while dealing with the Cullens. It shows a complex love triangle - like situation.