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A scientist named Serene Siren conducts an experiment with her submissive subject, Leana Lovings, in a lab. Serene's theory is that with consistent sexual stimulation and futa semen, she can induce new limb growth in Leana, essentially causing her to undergo a futanari change. Serene seats Leana on a sex machine, exposing her genitals for the machine's phallus penetration. As the machine's movements escalate, Leana's arousal increases, leading to wetness in her vagina and even nipple discharge. Serene becomes aroused as well, resulting in an erect phallus, and she instructs Leana to perform oral sex on her. Subsequently, Serene ejaculates into Leana's mouth, and post-ingestion of the futa semen, Leana sprouts her own phallus. Serene is thrilled with the successful outcome of her experiment, and Leana eagerly stimulates her newly acquired phallus until it becomes fully erect. The two futanari individuals commemorate Leana's transformation by engaging in passionate intimate acts. Witness the influence of scientific exploration!