Which story inspired a sub-genre of vampire films centered on lesbian themes?

The story that inspired a sub-genre of vampire films centered on lesbian themes is "Carmilla." Written by Joseph Sheridan Le Fanu in the 19th century, "Carmilla" features a female vampire who develops a romantic and sexual relationship with the protagonist, Laura. This narrative breaks from the traditional depictions of vampires, often dominated by male characters and heterosexual relationships, by placing female intimacy and desire at the forefront.

Carmilla's groundbreaking themes of female sexuality and the complexity of relationships between women have resonated through various adaptations, inspiring filmmakers and writers to explore similar themes in the horror genre. This has led to a rich sub-genre of vampire films that examine lesbian relationships, identity, and desire while also blending elements of horror. The influence of "Carmilla" can be seen in numerous contemporary works that seek to challenge or expand the traditional vampire mythos by incorporating LGBTQ+ perspectives and narratives.