Sunset is bitten by a bat that appears to just not exist in the human realm when she researches it. After the bite she's starting to experience some weird after symptoms, and has completely lost her appetite, but has a weird craving.
For the sex tag, there's no explicit sex just some suggestive scenes, and talk of it.
Insipred by one of my favourite stories on here, Sunlight by The Albinocorn. 100% check it out https://www.fimfiction.net/story/286605/sunlight