His Forbidden Princess by Emma Bray

She was never meant to be his. But he’s done pretending.
Princess Lirien has spent her life in a gilded cage, suffocating under royal expectations. When she slips away for one night of freedom—one reckless night to taste life beyond the palace walls—she never expects her shadow to follow. But he does. And when another man dares to touch her, her ruthless, possessive bodyguard snaps.
Dain Vorex has spent years keeping his distance, watching over his princess with silent, brutal devotion. But the moment she steps into the city, unprotected, his control shatters. He drags her away from prying eyes, his hands branding her, his mouth proving what she should have always known—she belongs to him.
Now, there’s no going back. Not when he’s had a taste. Not when the king announces her betrothal to another man. Not when Dain is willing to betray his kingdom, his honor, and his very soul to make her his.
He swore an oath to protect her.
But he’ll burn the world before he lets another man touch what’s his.