I'm a librarian who loves anime, manga, and reading a wide variety of genres.
"There are books about it. There are stories in the paper all the time. Did you see that one about the vampire guy who kept dating all the girl descendants in this one family? Can you imagine being, like, 'Granny's ex sure is hot!'"
That would be so awkward.
And we still haven't addressed the issue of Francis being much, much older than Cathy. It's been mentioned, yes, but that's pretty much it. Are there laws about this sort of thing? Does Francis's physical age make the fact that he's dating a teen okay? And what happens if he and Cathy are still together once Cathy's legally an adult? Will he suddenly count as an adult then? Or does he count as both a teen and an adult right now?