"All hail Emperor John XVI!" A hall full of female voices chant as you step forward in your ceremonial robes of office. It was some cycles (Earth years becoming antiquated in 2485) ago that you were born, you father's genetic modification sensing his bodies fading vitality issuing the only male child of his 211 cycle reign.
Your father's father's father, John XIII, was the first emperor after the purge. The purge wiped out all male life in the galaxy, apart from the emperor. Genetic modifications performed on the emperor in that time assured a number of things for the future of mankind.
Each emperor would have only one male child, conceived as their eternal genetic controls sensed their demise. The male child would be conceived the six standard cycles (One cycle representing about three earth years) before the child would reach maturity and the previous emperor would die.
The emperor's genetic code is fluctuating and complex, mutating frequently as evolutionary simulators enhance the intelligence and lifespan of each emperor at an expanded rate. This prevents incestuous breeding from leading to defects and continuing advancement of the species.
The emperor's genetic material was advanced to the point where his body produced an excess of semen and allowed him to breed well over once a minute, should he ever wish to. Emperor John XIV had done just this for fourteen straight days after a plague decimated the planets of Hoozach and Phelius VII.
The women in the hall facing you are all your half sisters ranging in age but all sexually mature and fertile. The emperor is always attended by a fertile woman should he desire to breed at any moment. (The women cycled into his service to achieve fertility)
The women too were augmented through genetic modification. Each of the women in this large hall is attuned to your body's pheremones. Your sexual excitement stimulates their sexual excitement. It is known that when the emperor cums, the world cums with him for each woman within a mile of the emperor will not be immune to his powerful emotions.
Your mother stands at your side wearing the honorable robes of the queen mother. (A hooded cape lined with fur. Beneath the cape, the queen mother is always naked though she herself is no longer fertile.)
The assembled women are arranged into several castes.
The Warrior Caste: Taller strongly built women dressed in plasta-steel armor. The armor has the appearance of a skin tight one-piece leotard that has been designed crotch-less to allow imperial access.
The Care Caste: These smaller lithe creatures are the artisans and servants. They are dancers, artists, poets, singers, cooks, bakers and all creative elements of society. They are dressed in gauzy cowls that cover almost none of their bodies as they move about gracefully.
The Scientific Caste: Are the most prominent and covered of the women. They are in charge of all the technical enhancements of the universe. These sisters of yours are all noted for their intelligence and they wear tightly fitting pants with official jackets. This clothing is easily torn away but for them the breeding is rarely as public as with the others.
Yet in front of the assembly are several girls of your age. These are girls who have not yet been selected for their castes. They were born on the same date as you and this being your coronation they are for you to spend your combined virginity on.
The first girl looks at you with sympathetic eyes. She is small and petite, her body still hairless in the style that many of your older sisters have adopted. Her long (To her ankles) blond hair is straight and pale on her head and her sweet smile reminds you of a gentle summer day on Relus II.
She second girl is tall and firm with defined feminine muscles. Her brown hair braided to a sensible shoulder length and her face is concentrated. She looks above all things eager to serve you as you can with your growing erection that each of the women in the hall are eager to serve you.
The third girl stares at you with eyes full of defiance. Her body longs for you but her mind seems unwilling to submit to this custom. Her body is shockingly pale, and her red hair tied back into a tight bun. Her pubic region the same bright red, is shaved into a perfect "V".
The hall stands eagerly for you to pick your sister and begin your reign as brood emperor. All that remains is for you to select the sister you wish.
Your mother intones, "Emperor John XVI of the Imperial House Doe. These three sisters share a birth with you and each stands fertile to bear the first of your many daughters. Choose and begin your reign. May it be long and fruitful."