>>11330341Semi related, but I've had this idea for a while of how a pure futanari/woman world could work for a while.
Basically, futanari evolved so that if a futa "claims" another by releasing cum into their mouth, then the claimed futa slowly becomes more and more like a normal woman, eventually losing their dick. This was an evolutionary adaptation so that fighting between futas was minimized. This can only really happen from the ages of 15-20 because once puberty is done the effects don't change much.
I imagined a prime futa, tall, broad, muscular, and her best friend who was secretly a futa. The best friend is jealous of all the attention that the prime futa is getting and starts spiking drinks with her cum. Once the process is near the end the prime futa is a full foot shorter, with wider hips and almost no dick anymore. The best friend claims the former futa and cements the process by coming inside of her womb.