He was born to inherit a kingdom built on sin.
His professor was never supposed to become his weakness.
At twenty-three, Lorenzo Castellano is the kind of man people fear before they even know his name: brilliant, controlled, and raised inside an empire that rewards cruelty and calls it legacy. He’s a mafia heir with a polished smile, a ruthless family, and a future already written for him—until conscience becomes louder than comfort, and one decision threatens to burn everything down.
At forty, Gabriel Ashworth has built his life around rules: reputation, discipline, distance. An ethics professor at Columbia University, he teaches morality like it’s a map—clear, structured, safe. Then Lorenzo walks into his classroom and turns every principle into a temptation. A forbidden teacher-student attraction. An age-gap MM romance where power, desire, and ethics collide.
What begins as intellectual tension becomes a dangerous proximity—late-night arguments, loaded silences, the kind of chemistry that makes “wrong” feel inevitable. And when Lorenzo’s world starts collapsing under the weight of crime, loyalty, and family control, Gabriel is pulled into a moral war he never trained for: help the student he shouldn’t want… or watch him become the monster he’s trying not to be.
Set between New York City and Milão, Sinful Lessons is a dark academia romance with romantic suspense, morally gray characters, and high-stakes redemption—a story about choosing love over fear, conscience over comfort, and the price of becoming someone new.
Tropes & keywords readers search for:
MM dark romance, dark academia, professor student romance, forbidden romance, age gap romance, mafia heir, morally grey MMC, power and control, ethical dilemma, romantic suspense, slow burn tension, obsessive attraction, high society crime family, redemption arc, forbidden love, emotional intensity, psychological romance, New York romance, Milan romance, enemies-to-something-worse-then-better vibes, high stakes love story.
Book One of The Ethics of Sin Trilogy.
For mature readers.
