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Kael Morozov is the anomaly the Spire has been waiting for—a man who grows with every orgasm, who produces a flood of seed with no refractory pause. The receptionist on the ground floor already hungers for it, but on the highest floor, the succubus Lilith Vane will demand every drop he can give. If he survives the climb, he'll find out what happens when a human body is pushed past its limits by a monster's appetite.