A few more alterations

As John hovered he realized two things, one that those transformed would have a harder time dealing with the weight of their new growth and two he could also introduce some 'random' factors. First he made it so that any futa transformed that wasn't already strong enough to carry their new assets could but would not exceed their natural strength unless they exercised. Next he would add 'random growth' to them, that could consist of their lips growing to be bimbo lips, their pussies, their height, their hair, or all of the above. Next he also gave them extended youth, so that they would remain looking 24 until they turned 60 in which they would start physically aging. Also as they aged their endowments would rapidly start shrinking. Finally he decided to add something very special, the Marks. The marks would be a special tattoo like mark that would appear just above a futa's groin.

There were 4 Marks in total, the Hyper Mark, would mark those that could grow to hyper sizes, their dicks and balls would keep growing till they reached 30 years old, any partner they had during sex would be capable of stretching infinitely and they would have the strength to move during sex and normal life easily. But to make things easier, if they could manage to cover their sexual bits completely they would shrink to a more manageable size. As for the chance of having this mark 1 in 10,000 futa could have this mark.

The next Mark was the Breeder Mark, this mark would cause that have it to have their balls to rapidly enlarge so much so that they would need help carrying them with special clothing or even devices. The Breeder Mark would cause their balls to swell up till they turned 30. They would also become fertile, capable of both breeding and being bred and could impregnate and be impregnated forever. The chance of having this mark was 1 in 200,000, though the chances were 1 in 1,000 for futa in Israeli, Saudi Arabian, and Indian futanari. Similar to the Hyper Mark partners involved with futa with this mark would be capable of stretching infinitely.

Next was the Beast Mark, this mark could cause the carrier to turn into an animal girl, to be fair they would have animal-humanoid bodies, but maintain their facial features, and their hands. What animal they would turn into would vary depending on one of three conditions, 1. If they owned a pet, what pet they interacted the most with. 2. What animal they are near for large amounts of time. 3. If they fulfilled neither of these two conditions, then they would turn into a animal that best suited their personality. That being said their dick would stay human to keep it the same. This was a 1 in 1,000, chance of having.

The Final Mark was the Shifter Mark, this mark would give the user the ability to alter the size and shape of their body. They could not change their facial features, but everything else was fair game, their hair, eye color, they could also grow to a maximum of 8 feet tall, and their breasts and balls could grow to the size of a giant pumpkin, as could their butts, they could also grow their lips, lengthen their tongue, their dick, and make them also thicker too. This was very rare a 1 in 1,000,000,000,000,000 in fact it was so rare, that in today's society only 5 people had this mark. John thought on these changes and wondering if there was anything else to change but he felt pretty satisfied all he had to do was unleash the symptom to the world... or perhaps he should partake in it...?