Kyrie was mysteriously abandoned as a child when her people the Ouri fled the planet Sirene.  She's grown up among the planet’s ‘other’ race to become Mistress of Justice alongside Sirene’s dictatorial ruler Galen, but Kyrie’s unique biology dictates she must now find an Ourian to mate with or die. 

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Proteus returns to Sirene to rescue the child accidentally left behind, but through a trick of time, he finds a woman he is forbidden to mate with, even to save her life. And when Galen forces Proteus to sexually service Kyrie, Proteus uses every trick at his disposal - short of mating - all while plotting his and Kyrie's escape.

Galen and Proteus are desperate to save Kyrie's life for very different reasons – but they both know the fate of their planet depends on her survival.