A Magical Imperative - Edith Pawlicki - Bog

One binding destroyed her family; could another save it?

At thirty-six-years-old, history professor Aurelie is resigned to a childless existence. It's not her age - it's the absence of male Unseen. Her species has been so desperate to hide among humans that it is quietly dying out. Now her family is broken; eager to leave behind a painful past, Aurelie accepts a teaching position in Nara, Japan. But she's unprepared for the future she finds...

Twenty-two-year-old Kazuki is the favored son of the Hayashi family - a clan of Unseen that has not only survived in Japan, but thrived. Though he knows hundreds of Unseen, he's unprepared for Aurelie and the overwhelming attraction he feels for her, a biological imperative to mate.
Or perhaps a magical one because, as Kazuki and Aurelie grow closer, the reasons for hiding come out.

And they are hungry.