A Blade and an Iron. An Instructor and a Cadet. Brawn and Brains. Fire and Ice. Forbidden. At the Drexian Academy, there are few rules. As a Blade instructor, Kann prefers pushing limits to following regulations. But he knows better than to fall for a cadet. That's why he is only friends with Britta, a human cadet and brilliant engineer. It's also why he agrees to help her when she develops a crush on a visiting Taori scientist. He can't explore his feelings for her, but he can teach the bookish cadet everything he knows about the art of seduction. But with each tantalizing tip and sensual strategy, the line between practice and reality blurs. As much as he finds himself falling for Britta, she sees him as only a friend and teacher. Or does she? As they work together to protect the Drexian Academy and mount a rescue mission for a missing pilot, their secret lessons spark a fire that threatens to consume them both—and put the mission at risk. Will they break the rules or let themselves be broken apart? Obsession is the fourth book in Tana Stone’s Warriors of the Drexian Academy series, contains an HEA, and will leave you wanting more cunning Assassins, badass Blades, brilliant Irons, and daring Wings.