A Kiss Of Immortal Blood. The Aegean Vampires, #1

Carissa Dumont-Beavois has always known who she is: a vampire, an heir, and a perfectionist determined to keep her heart firmly under lock and key. Love is messy. Dangerous. And absolutely not part of the plan. Then she meets Theo Blackwood. He's charming, infuriatingly magnetic-and a werewolf heir bound to a legacy just as heavy as her own. Their families share a blood-soaked history, sealed by an ancient curse that promises devastating consequences if a Beavois and a Blackwood ever fall in love.
What begins as a friendship quickly spirals into something far more dangerous. As forbidden feelings ignite and supernatural bonds awaken, Carissa is forced to confront a terrifying truth: loving Theo could cost her everything-her immortality, her family, and her future. With fate pulling them together and the curse threatening to tear them apart, Carissa must decide how much she's willing to sacrifice for a love that was never meant to exist.
Some kisses are irresistible. Some are deadly. And some change you forever.