Heart of the Hunted by Georgina Stancer

Taredd has been hunting humans for hundreds of years, slaying them like cattle without remorse. He’s a soulless demon, a creature who shows no mercy.
When Taredd and his friend makes a bet to see who can find a human first, Taredd sees it as an opportunity to prove he’s the better hunter. The most skilled killer. He just didn’t count on his prey being a feisty, sassy female with a body to boot.
Natalia is nothing like the other humans he’s encountered. There’s something about her that intrigues him, captivates him, urging him to save her life rather than take it.
With a desire that only seems to get stronger as he spends more time with the human female, Taredd is faced with a decision that will ultimately seal his own fate.
Will he stay true to his nature, killing every human he can find—including Natalia? Or will he go against everything he’s ever believed in and fight his own kind in order to save the woman who thawed his blackened heart?