Rabbit in the Moon

How do I go about working in a vampire subplot into a story about a malevolent AI?? I cannot figure it out. The two things are unrelated. I don’t know if I want to make new non-vampire characters for that comic (Rune Pandora is the tentative title) because it’s the one I have all the notes for and the plot is actually pretty good, if I do say so myself. The new story that I put the vampire characters in is relatively bare bones plot-wise. I just really don’t want to make them suddenly not vampires anymore. I am very averse to change. I don’t know what to do and I have no ideas for how to work in the vampire angle, someone please help me 😭