Guardians Series by Maureen Child

He was a Guardian. An immortal fighter of evil. The sexy, sword-wielding stranger standing before Julie Carpenter claimed he was out to destroy a demon and that she was its next target. As he whisked her away to his fortresslike mansion high in the Hollywood hills, she could only hope "Kieran" was not the true danger. For centuries Kieran had heard the legend of Destined Mates...but he never believed until now. He could read Julie's thoughts, sense her deepest desires... moreHe was a Guardian. An immortal fighter of evil. The sexy, sword-wielding stranger standing before Julie Carpenter claimed he was out to destroy a demon and that she was its next target. As he whisked her away to his fortresslike mansion high in the Hollywood hills, she could only hope "Kieran" was not the true danger. For centuries Kieran had heard the legend of Destined Mates...but he never believed until now. He could read Julie's thoughts, sense her deepest desires. And he knew she wanted him just as he knew joining with her would make him strong enough to defeat any demon from hell. But the cost might be losing the woman who was his true salvation. less

Reborn moments after Queen Isabella of Spain ordered her lover's death, Santos accepted eternal life in exchange for protecting humanity. For centuries, he's kept himself secluded in a hillside mansion. But all that changes one night when he takes in a woman who claims to have seen him in a vision. A dire prediction has convinced Erin Brady she will be murdered on her thirtieth birthday--and that Santos is the only man who can help her... moreReborn moments after Queen Isabella of Spain ordered her lover's death, Santos accepted eternal life in exchange for protecting humanity. For centuries, he's kept himself secluded in a hillside mansion. But all that changes one night when he takes in a woman who claims to have seen him in a vision. A dire prediction has convinced Erin Brady she will be murdered on her thirtieth birthday--and that Santos is the only man who can help her. Unwittingly drawn to the beauty who can read his thoughts and heart like no one ever has, Santos realizes she is his Destined Mate. And with the threat of her imminent extinction ticking like a time bomb, Santos suddenly has something worth dying...and worth living for. less

Forever fated to defend humanity against demons, immortal Guardian Rogan Butler has given up all hope of finding peace. But when a beautiful American unexpectedly appears, with all her self-assurance and charm, the winds of danger--and a soul-deep recognition--reawaken the warrior's long-buried desire....Alison Blair came to Ireland duty-bound to tell Rogan of a sinister premonition, only to be rebuffed... moreForever fated to defend humanity against demons, immortal Guardian Rogan Butler has given up all hope of finding peace. But when a beautiful American unexpectedly appears, with all her self-assurance and charm, the winds of danger--and a soul-deep recognition--reawaken the warrior's long-buried desire....Alison Blair came to Ireland duty-bound to tell Rogan of a sinister premonition, only to be rebuffed. Then evil strikes when her sister mysteriously disappears, and only Rogan can protect Aly from a fate worse than death. Can this brooding warrior be her Destined Mate--the key to a forgotten past, and to her future? less