Forget romantasy, what about romantorror?

Romantasy, or romantic fantasy, is huge nowadays. The bookish part of the internet is flooded by posts showcasing books by Sarah J. Maas, Rebecca Yarros, and others. Last year, Romantasy even became a category in the Goodreads Choice Awards. (The winner, not surprisingly, was Fourth Wing by Rebecca Yarros.)

The popularity of this genre that mixes romance with fantasy made me wonder if I've been missing the boat on other genres that are combined with romance? What about romance and horror (romanto...