Bloodchild
By Octavia Butler, first published in Asimov's Science Fiction
An alien race uses humans to host their parasitic offspring. After a human boy witnesses the birth of these parasites, he is horrified by the symbiotic agreement and realizes why the alien has nourished him so much better than his siblings all his life.
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The human Gan is wrapped in Gatoi's several, undulating limbs when the alien creature hands him an entire egg of hers to have to himself, while she gives one egg for the rest of the family to share.
Gan's mother, Lein, looks at him with worry, but he gladly empties the contents of the nutritious egg into his mouth. While his mother lets the children eat, she refuses to have any until the alien Gatoi forces her to eat the remainder of Gan's egg. When they were younger, Lein and Gatoi had been close, growing up alongside each other. In exchange for protecting Lein, Gatoi was promised one of her children. Gatoi's alien race uses humans as breeding grounds for their parasitic offspring, and though long ago, there was much bloodshed disputing this fate for humans, eventually a compromise was reached. Now, creatures like Gatoi would live with a family, protecting and nourishing them, and in exchange, one person could be used to host their offspring when the time came. Though Gan has known this information all his life, he's never given much thought to who in their family would host the alien's eggs. Hearing commotion outside, Gatoi discovers a man who clearly has had the parasites inserted into him, though his companion creature is nowhere to be found. Performing emergency birth on him, Gatoi paralyzes him using her stinger, cuts him open, and begins removing the worm creatures from his abdomen one at a time, before they eat their way out of him. Gan is horrified by the ordeal, now understanding exactly what he was being nourished to do. After the horror of the alien birth, Gan brings a gun to his head, fearing the fate that will be expected of him soon. Gatoi reasons with him, saying that if he doesn't host her young, one of his siblings will. He lowers the gun, resigning himself to suffer so that his siblings don't have to. Gatoi uses her stinger to administer a pain reliever to him, then begins moving her young into his bloodstream, promising to take care of him so that he won't suffer the same fate as the man with the ill-timed birth.
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