I haveeeeeeeeee multiple ideas.
yeetus-ok-letsa go-
basically is vampire boi who meets human with very yummi blood. They keep running into each other and eventually Vampi boi, drawn to hooman, asks him out. They go out for a little while before Vampy boi finally breaks down and does the omnom, telling hooman the truth after. Human's honestly surprisingly chill with it and even agrees to let vampi boi drink his blood whenever he needs. They get closer and closer to each other, but Vampy boi starts to notice that something's becoming more and more wrong with human...