The Crown Prince's Hidden Lover by Angel Pena

The Crown Prince's Hidden Lover is a gay royal romance set in the fictional kingdom of Aldoria. Crown Prince Casimir Duval has spent five years hiding his love for Remy Delacroix, the palace's master of arms and a commoner. Their secret meetings during the "violet hour" are threatened when Casimir is ordered to marry Lady Clarisse Fabron to secure the succession.

As political pressure grows, Casimir decides he will no longer sacrifice the man he loves for the crown. His dying father secretly supports him, while Princess Lise and Colonel Bastien become unexpected allies. But Grand Duke Leopold Fabron is determined to use the prince's secret to strengthen his own political power. With spies watching the palace and the betrothal looming, Casimir and Remy must find a way to make their forbidden love survive the demands of the throne.