One common theme is the struggle with their new identities as vampires. Since they are from the Naruto universe originally, becoming vampires changes a lot for them. Another theme is the relationship between Sasuke and Naruto, which often gets more intense and complex in these fanfictions.
Archive of Our Own (AO3) is also a great place. It has a well - organized tagging system. Look for the 'sasunaru' and 'vampire' tags, and you'll be presented with a bunch of relevant fanfictions. The site also has some quality control, so you're more likely to find well - written stories.
There's also 'Sasunaru: Blood Moon'. In this fanfiction, Sasuke is a powerful vampire lord and Naruto is a human who gets caught up in Sasuke's world. It's full of action, drama, and of course, the slow - burn relationship between the two. The author does a great job of creating a dark and alluring vampire - centric universe for the characters.
Love and acceptance are common themes. Sasuke and Naruto often have to deal with the fact that their relationship is different due to the vampire aspect and the mpreg situation. They need to accept each other fully and also face the judgment of others in their fictional world.
One common theme is the forbidden love. Since Sasuke is a vampire and Naruto is usually portrayed as a normal human or something different, their relationship goes against the norms of their world. It creates a lot of tension and drama.
One common theme is the power dynamics. Since Sasuke is often portrayed as a vampire, he has certain powers, and Naruto, as his mate, has to navigate that power difference. Another theme is the struggle for acceptance. Naruto might struggle to accept being a vampire's mate, or the vampire society might not easily accept their union.
One common theme is the forbidden love between Sasuke and Naruto. Since Sasuke is a vampire and Naruto is often a human or from a different 'world' in the fanfiction, their love is usually against some rules or norms in the vampire high school society.
Another one to check out is 'Sasunaru: Vampire's Destiny'. It explores how Sasuke, as a vampire, copes with Naruto's unexpected pregnancy. The story is quite engaging as it weaves together their love story, the vampire society's rules, and the anticipation of new life.
I also like 'Eternal Night, Sasunaru'. It portrays Naruto as a human who gets entangled with Sasuke, a powerful vampire. Their love story unfolds against the backdrop of a dark and gothic - like world. The fanfiction is really engaging as it combines the elements of the Naruto characters with vampire mythology.
There's also 'Vampire's Embrace'. In this fanfiction, Naruto is turned into a vampire and Sasuke has to help him adjust. It's interesting because it explores their characters in a different light. There are many emotional scenes and the author does a great job of building the world of vampires within the Naruto universe.