Unmasked By A Devil by Wendy Vella

The man who was loved by everyone… except her
Zachariel Deville knew what people thought of him. The youngest brother, all charm, and no substance. He knew better. His serious side came out when he performed his duties for the king or protected his family. He cared nothing about how others perceived him. Except her, of course. He cared very much about that.
The thorn in Zach’s existence was Mary Blake. She got under his skin, and to his horror, he’d just realized the reason. He was attracted to her. Add to that, she was hiding something from him, and suddenly the life he’d always known had been turned on its head.