The Airship:
The legends and myths of the anthro species tell of a time in the distant past, long before the Airship, when they lived with their Creators, the Humans, serving them as pets and companions.
"Those enlightened few species who found a place within the myriad homes of the Creators knew true happiness for many generations as their masters advanced as time went on. But there were those who did not join them in the embrace of Humanity; the Undomesticated; the Wild; the Prodigal.
Turning away from Humanity's offer of love and companionship, the Undomesticated surrendered to their instincts, becoming little more than beasts. Dismayed, Humanity tried to draw the Undomesticated into the fold, even as the Undomesticated began to dwindle in number, but it was no use. Eventually, only the Domesticated, this who had been faithful all along, remained. Both furious and depressed, the Creators turned their feelings on each other, accusing themselves of failing in their mission to preserve the lives of those that could one day have joined them.
The Creators, blinded by their anger and pain, allowed the resources sustaining their cities of steel and glass to run dry, and prepared their mighty armies to secure what they could.
And in the midst of the confusion, a small group of Creators, each a master of their discipline, began to construct the Airship, in the hope that some would survive the coming Armageddon. The forms of the Domesticated were fragile and weak, so they were improved, gifted with the sacred form of the Creators themselves. But even with their new bodies, the Domesticated lacked true intelligence. This too, was gifted to them by the Creators so that they could survive and prosper, and maintain the holy Airship.
And, joy of joys, some few Undomesticated had been saved! Their numbers partially restored, they too were gifted with the forms and intelligence of the Creators. But the Creators were sad, their companions both old and new would soon be leaving them.
"We do not want to go, Masters.", said the Enlightened, boundaries between the Domesticated and Undomesticated having been forgotten. "Please do not make us go. We love you." The Creators grew solemn. "We are sorry, our children, but you must go. There are those among us who would seek to destroy one another, and we must save you before they accomplish this goal. To guide you, we have prepared a set of rules for all Enlightened to follow:
You shall not kill.
You shall not steal.
You shall not lie.
You shall not damage the Airship.
You shall not return to the ground until one of us appears on the Airship, in person.
But we want you to be happy, children. There is enough food on the Airship to last forever, you shall not go hungry. There is enough water on the Airship to last forever, you shall not go thirsty. We have placed our books and our games and our plays and our movies and our music on the Airship, you shall not grow bored. We have changed your bodies in ways you cannot conceive, you shall not grow old and illnesses shall not touch you. We have placed machines that can replicate any of you from just a single drop of blood, you shall not become extinct.
We also have a request."
"We would do anything for you, masters!" the Enlightened replied.
"Remember us."
But then, it was time for the Enlightened to ascend. They entered the Airship, which was as large as one of the cities of the Creators, and found dwellings therein for every species. Every species had been turned into an Enlightened, an Anthro, every insect, every mammal, every reptile, every bird, every animal. And there was more than enough space for them all, from the horses who towered at heights of over ten feet, to the insects who were merely a few inches taller than the Creators, such was their ingenuity.
And the Airship climbed above the clouds, never to touch to ground until the Creators return."
Some quick notes about this reality:
The anthros range from roughly seven feet tall to twenty feet tall, depending on the size of the animal they are an anthro of. For example, an anthro insect would be the minimum height of seven feet tall, an anthro horse would be anywhere from eleven to seventeen feet tall, and the vast majority of anthro orcas would be the full twenty feet tall.
The anthros worship humans as gods. Expect any humans entering this reality to be bowed down to, even by the anthros so large that they are almost house-sized.
The Airship is completely self-sustainable, and has enough food and water to last for thousand of years.
Female anthros in this reality possess two breasts, regardless of how many teats the animal they come from had if they were a mammal, and regardless of the fact that non-mammalian animals do not have breasts.
Anthros can get rather huggy around humans. Expect physical displays of affection.
Anthros do not age once they become adults, and they can of become ill, no matter the circumstances, as their immune systems are just that strong.
So, do you want to go with this reality, or find another?