Tender Is the Flesh by María, Bazterrica, Agu

Marcos is in the business of slaughtering humans - only no one calls them that. He works with numbers, consignments, processing. One day, he's given a specimen of the finest quality. He leaves her tied up in an outhouse, a problem to be disposed of later. But she haunts Marcos. Her trembling body, and watchful gaze, seem to understand. And soon, he becomes tortured by what has been lost - and what might still be saved.