A possible plot could be that Carmilla and Laura are in a relationship, but Danny starts to feel left out. So, they all three sit down and talk about it. They then decide to include Danny more in their activities, which leads to some really fun and heartwarming adventures together.
It might be in a fanfic that takes place in a post-apocalyptic world where power struggles and chaos lead to Carmilla being abused. Such a setting could provide a unique backdrop for this theme.
Carmilla had indeed been resurrected in Dekai Ultraman. In the plot, Sfia collected the fragments of Carmilla and the fragments of the evil god Megarojee and fused the two together, allowing Carmilla to be revived. Carmilla's resurrection was unexpected because she had already disappeared into the sea in the previous plot. The resurrected Carmilla and Teliga were entangled again, and she participated in the battle with Sfiammegalogaea. Therefore, according to the information provided, Carmilla had indeed been resurrected.
One possible plot could be that Laura, as the Goddess of Death, has to deal with the vampire Carmilla in a world where the supernatural is not fully accepted. Laura might be on a mission to either bring order to the chaos that Carmilla's existence causes or to understand the vampire's place in the cycle of life and death.
You can try searching on popular fanfiction websites such as Archive of Our Own (AO3). It has a large collection of various fanfictions, and there's a good chance you'll find some related to Carmilla and Laura with the 'Goddess of Death' concept there.
The 'Carmilla' short story is a Gothic horror classic. It often features themes of female vampirism and the allure of the unknown. Carmilla herself is a complex character, with her charm and danger intertwined.
The novel 'Carmilla' is queer because it features elements such as forbidden love between women and subverts conventional notions of romance. It also plays with gender roles and expectations in a unique way.
I'd say Carmilla leans towards fantasy. The story usually involves elements like enchanted settings, mysterious spells, and otherworldly beings, which are common in fantasy works rather than science fiction.