He'd done it. He'd finally done it. After years of searching, he'd found the Wishing Rock. Now he could make any one wish he wanted, no matter how ludicrous, long-winded, or specific it was. Then, the Wishing Rock would vanish for 100 years to recharge its phenomenal cosmic power. This unknown man, this enigmatic entity, he made his wish. A wish that would reverberate around the entire world, changing it to fit his perverted, sexual ideals.
Slowly, all around the world, people were starting to thicken. At first it wasn't all that noticeable. A few tight pants here, a few uncomfortable bras there. Then, one woman ended up with boobs, butt cheeks, and thighs the size of beach balls or yoga balls in the blink of an eye. Then, another nearby woman developed similar hyper sized assets. Then another. Then another! Then several at a time! Much panic began as these hyper expansions began to spread, but the thickened women didn't seem all that troubled. In fact, they seemed perfectly fine with their hyper hourglass proportions, although they did feel a lot more horny.
Then, something happened to the men. One by one by several at a time, they suddenly started turning thick and feminine. Their own asses and thighs blew up like beach balls, and their dicks became meter long girthy behemoths. As the thickening spread, these shemales too became incredibly horny. It was quickly discovered that their monstrous cocks could miraculously fit inside any vagina or anus like a glove, and that they could produce gallons of semen at a time. Everyone's bodies had also become accommodatingly stretchy to handle practical swimming pools' worth of cum!
Thus began a long era of casual, polyamorous hyper sex. It wasn't uncommon to see two women with blimp-like assets scissoring in an alleyway, or to see a shemale pump another girl until her belly looked like an overinflated balloon. Life became a sordid porno, and everyone was absolutely okay with it.