I found the romantic tension in 'The Cruel Prince' to be more about psychological warfare and charged power dynamics than what I'd typically call 'spicy' in a physical sense. The scenes between Jude and Cardan are intense, but the intensity comes from the dangerous game they're playing, the betrayal of trust, and the razor-sharp dialogue, rather than from detailed, steamy descriptions. Holly Black builds their connection through cruel taunts, fleeting touches loaded with meaning, and moments of vulnerable exposure that feel just as risky as any battlefield. The so-called 'spicy chapters' readers might discuss are probably those later in the series, particularly in 'The Queen of Nothing,' where the relationship evolves from hatred to a more complex, negotiated partnership. Even then, the writing stays true to the book's overall aesthetic—it's faerie romance, which means it's beguiling, unsettling, and often wrapped in thorns.
If you're coming from romantasy novels that feature very explicit, modern-sensibility intimate scenes, you might find this approach less overt. The chemistry is undeniable, but it's channeled through political maneuvering and the constant threat of violence. A kiss isn't just a kiss; it's a declaration of war or a temporary truce. For me, this made every moment between them far more gripping and memorable. The payoff feels earned precisely because it's been distilled through so much conflict and emotional ambiguity. So, while I wouldn't label it the spiciest book on the shelf, the romantic moments crackle with a unique, potent energy that sticks with you long after you finish reading.