Author's note: We've had dogs, we've had horses, let's do cattle now.
Jeff had considered the possibilities of what he could do with the world changing package, it actually perplexed him on what he should ultimately do with it. It's like a situation of someone having so much variety of ice cream to choose from, so much so that it's impossible to choose. This situation right now was exactly that. There was so much he could do now that picking just one was difficult, so he continued to ponder about it.
A couple of things that crossed his mind were mass physical changes and societal changes. Like for instance having men and women swap gender roles and certain sexual characteristics where men develop large breasts and dainty figures while women are swole and strong. Other's are for where everything is hyper sexualised and things like sex is just as common to see in public as two people greeting each other. Other changes he had thought of related to testing it on animals and observing how they could be changed.
Eventually, his mind began to land on role swaps. Previous he though about men and women swapping gender roles, but then he considered other swaps. Changing fashion so that what would be considered baby clothes become more mature clothes and vice versa, or swapping roles between dogs and humans. The latter idea eventually spawned onto other idea with swaps with horses, pigs, birds, fish and all sorts of different animals before Jeff landed on one solid idea. Swapping with Cattle, with cows and bulls.
It was an interesting thought and one that got him quite excited. Humans being degraded into a slow minded species while cows and bulls end up dominating society and society is centered around them while he himself would be in a grassy field, mating with some random woman. The fact it played on Jeff's mind how society would be if humans and cows swapped roles got him really excited and he wanted to put the changes in. He'd be able to live and enjoy a life where he didn't need to stress about anything other then having offspring was a tempting offer.
Opening up the chronivac once again, Jeff inputted the changes into the display. He had to be slow about it and thing about certain things in this society that he wanted to guarantee. If he inputted a simple 'humans and cattle swap roles' then it may cause things he didn't want so he wanted to at least control some aspects of it. This, combined with plenty of time to himself, gave Jeff the time to write out the full changes that would happen.
*Humans and Cattle will swap roles.
Humans would become dairy animals and all things that are associated with cows and bulls, would now be associated with humans. This also applies vice versa with cattle, as cows and bulls would become the new dominant race and do things that humans used to do. For example, humans would live naked and walk on all fours while cows and bulls would wear clothes.
Biologically, humans would now gain more weight and fat that develops around their bellies and their asses. Their skeletons would adapt to life on all fours and their necks would have humans perpetually looking straight, with it also getting longer to allow human heads to reach the ground for grazing. This also ties into the fact that human legs and arms would lengthen and become equal in length., with human hands and feet ending in hooves. The human body becomes and lot more barrel shape and like cattle used to, humans would have a strictly vegetarian diet with four stomachs and teeth that adapt to this new change. For more gender specific changes, human males would develop larger penises and testicles that are enveloped in a sheath, while human females would develop even larger breasts, and even a secondary or tertiary pair of breasts; and nipples that are lengthy and look like teats from the old cows udders. Vaginas would also move closer to the anus like how old cow's would have their vaginas their to allow males to easily breed with females. Humans, both men and women, would also develop a lot more body hair.
On the other end of the spectrum, Cows and Bulls would now have more slim bodies and would develop hands and digits that make it easier to carry stuff. Proportionally, they would be the size that humans used to be, although on average slightly larger all around with the average height being a couple of inches bigger than the old average for humans. Society would mostly be similar to how the old human society looked, except things are now bovine instead of human. Horns that are developed by cattle would still exist but they are treated more like hair now, able to be stylised and such like humans used to be with their hair.
For biological changes, a lot of the changes are vice versa with humans. Sexually as well, bulls would have penises that go flaccid and erect without a sheath, while cows and their udders would develop more like how human breasts used to. Some differences though is that udders would still be connected between the two nipples, and cow nipples are short and not as lengthy as they used to be. Bras would even be adjusted to fit around the udders that are just about the crotch, instead of breasts situated around the chest.*
Finishing up with the changes Jeff wanted and letting the Chronivac fill in the rest, he hit enter and watched the (not literally) magic happen.
With Jeff's Change being implemented, who would be followed to see the changes unfold?