Futination

Meet Serene Siren, a futanari mad scientist with a theory too wild to keep in the lab notebook. Her new test subject, the submissive Leana Lovings, is about to find out that science can be very hands-on. Serene's hypothesis? The right mix of nonstop stimulation and a little futa cum might trigger some spontaneous growth of a brand-new appendage. Serene sets Leana on a sex machine, sliding her panties aside so the toy can get to work. As the vibrations climb, Leana gets wetter and wetter, and her nipples even start lactating. Watching all this gets Serene so worked up that her cock stands at full attention, and she has Leana drop to a blowjob. When Serene finally unloads into Leana's mouth and Leana swallows, the experiment pays off: she sprouts a cock of her very own. Thrilled that her hypothesis holds up, Serene watches Leana stroke her fresh addition until it's big and hard. Then the two futanari beauties celebrate the successful transformation the only way that makes sense, with plenty of incredible sex. Call it a breakthrough, call it a growth spurt, either way the results speak for themselves. Behold, the power of science, peer review not required.