Carmilla

Carmilla is an 1872 Gothic novella by Irish author Sheridan Le Fanu and one of the early works of vampire fiction, predating Bram Stoker's Dracula (1897) by 26 years. First published as a serial in The Dark Blue (1871-72), the story is narrated by a young woman preyed upon by a female vampire named Carmilla, later revealed to be Mircalla, Countess Karnstein (Carmilla is an anagram of Mircalla). The character is a prototypical example of the lesbian vampire, expressing romantic desires toward the protagonist. The novella notably never acknowledges homosexuality as an antagonistic trait, leaving it subtle and morally ambiguous. The story is often anthologised, and has been adapted many times in film and other media.

Carmilla, the title character, is the original prototype for a legion of female and lesbian vampires. Although Le Fanu portrays his vampire's sexuality with the circumspection that one would expect for his time, lesbian attraction evidently is the main dynamic between Carmilla and the narrator of the story:
Sometimes after an hour of apathy, my strange and beautiful companion would take my hand and hold it with a fond pressure, renewed again and again; blushing softly, gazing in my face with languid and burning eyes, and breathing so fast that her dress rose and fell with the tumultuous respiration. It was like the ardour of a lover; it embarrassed me; it was hateful and yet overpowering; and with gloating eyes she drew me to her, and her hot lips travelled along my cheek in kisses; and she would whisper, almost in sobs, "You are mine, you shall be mine, and you and I are one for ever." (Carmilla, Chapter 4).
When compared to other literary vampires of the 19th century, Carmilla is a similar product of a culture with strict sexual mores and tangible religious fear. While Carmilla selected exclusively female victims, she only becomes emotionally involved with a few. Carmilla had nocturnal habits, but was not confined to the darkness. She had unearthly beauty, and was able to change her form and to pass through solid walls. Her animal alter ego was a monstrous black cat, not a large dog as in Dracula. She did, however, sleep in a coffin. Carmilla works as a Gothic horror story because her victims are portrayed as succumbing to a perverse and unholy temptation that has severe metaphysical consequences for them.
Some critics, among them William Veeder, suggest that Carmilla, notably in its outlandish use of narrative frames, was an important influence on Henry James' The Turn of the Screw (1898).

Le Fanu's work has been noted as an influence on Bram Stoker's masterwork of the genre, Dracula:
Both stories are told in the first person. Dracula expands on the idea of a first person account by creating a series of journal entries and logs of different persons and creating a plausible background story for their having been compiled.
Both authors indulge the air of mystery, though Stoker takes it further than Le Fanu by allowing the characters to solve the enigma of the vampire along with the reader.
The descriptions of the title character in Carmilla and of Lucy in Dracula are similar. Additionally, both women sleepwalk.
Stoker's Dr. Abraham Van Helsing is similar to Le Fanu's vampire expert Baron Vordenburg: both characters investigate and catalyze actions in opposition to the vampire.
The symptoms described in Carmilla and Dracula are highly comparable. ... (wikipedia.org)