Such Exquisite Calamity by Sydnie Beaupré
Spencer and Cayden have always known that they were different from each of their parents, but when Spencer saves Cayden from a stab wound using only her tears and sheer willpower, they find out exactly what they are: the only two of their kind, born under a prophecy. Not Caster, not Familiar, but an impossible combination of both known as The Two, or The Lovers.Stumbling through the new world of Casters, Familiars and Demigods together proves dangerous for the pair, and unwanted enemies arise as emotions between them become more and more complicated.