Review: King of Sloth (Kings of Sin #4) by Ana Huang

Plot Summary

He'd never wanted anyone enough to chase them...until he met her.

Charming, easygoing, and rich beyond belief, Xavier Castillo has the world at his fingertips. 

He also has no interest in taking over his family’s empire (much to his father’s chagrin), but that hasn’t stopped women from throwing themselves at him…unless the woman in question is his publicist. 

Nothing brings him more joy than riling her up, but when a tragedy forces them closer than ever, he must grapple with the uncertainty of his future—and the realization that the only person immune to his charms is the only one he truly wants.  

***

Cool, intelligent, and ambitious, Sloane Kensington is a high-powered publicist who’s used to dealing with difficult clients. 

However, none infuriate—or tempt—her more than a certain billionaire heir, with his stupid dimples and laid-back attitude. 

She may be forced to work with him, but she’ll never fall for him…no matter how fast he makes her heart beat or how thoughtful he is beneath his party persona. 

He’s her client, and that’s all he’ll ever be. Right?

My Review

Rating: ★★★☆ ☆(3/5)

Ana Huang’s King of Sloth delivers a simmering slow-burn romance full of tension, vulnerability, and undeniable chemistry. The fourth installment in the Kings of Sin series, this book can easily be read as a standalone—but returning readers will appreciate the familiar glimpses of the world Huang has built.

At its heart, this is the story of two opposites who unexpectedly find solace in each other. Xavier Castillo is rich, charming, and effortlessly laid-back—a man used to getting what he wants without trying. But when it comes to Sloane Kensington, his high-powered publicist with a sharp tongue and even sharper wit, all of his usual tricks fall flat. She’s immune to his easy charm, and he’s fascinated by that.

What begins as playful antagonism soon transforms when a tragedy forces them into close proximity. Their slow-burning attraction is ignited not by grand gestures, but by the quiet, everyday moments: a shared glance, a late-night conversation, a moment of unexpected vulnerability. It’s in these small shifts that the romance truly comes alive.

Xavier’s journey from carefree playboy to emotionally grounded partner is deeply satisfying to witness. Beneath his laid-back exterior lies a thoughtful man grappling with grief, purpose, and the desire to be more than just a name in his powerful family. And Sloane—disciplined, self-possessed, and fiercely independent—slowly allows herself to trust, to feel, and to accept love without seeing it as a weakness.

Their relationship grows organically, full of crackling banter and gentle emotional unraveling. It’s a story about finding comfort in someone you least expect, and falling for them not in a rush—but in a steady, patient way that lingers long after the final page.

King of Sloth is a romance that doesn’t rely on flash or drama. Instead, it builds a deep connection rooted in emotional honesty and mutual growth. It’s thoughtful, steamy, and soft in all the right places.