Imagine Kaneki and Gwen From Tokyo Ghoul but as a dark romance book

Okay, so for those who haven´t watched or read the manga here´s a short description of what Kaneki and Gwen are like:

Think of a shy, innocent male lead the kind of boy who blushes when someone looks at him catching the attention of an older, silent, observant FMC who studies him like a character in her favorite book. She’s the dangerous one. He’s the soft one. And the story spirals from there!