Bryan ultimately decides on changing the zoo animals and the staff into anthro versions of themselves. But he wants it to be slow and gradual. By the morning of each day of the coming week, the physical and mental changes will have progressed in a random way. For some, their ears will change. For others, tails will grow. They will only progress while the staff and animals sleep. The longer they sleep, the more changes that happen to them. Some of the staff will notice changes in others and the animals, and some will not notice any of the changes. In any case they will all be oblivious to their own changes as well as anyone else's changes that reflect theirs. By the end of the week, they will think everything is normal.
At the end of the week, the whole staff, including himself, and the zoo animals will be anthropomorphic adults. They will be able to speak like humans and as animals, will be completely naked, have much higher sex drives, have some animal-like behaviors, and will be completely and 100% sexually attracted to any gender or species. They may have various qualities they prefer, like preferring men more than women or mammals more than birds. Sex will not result in pregnancies. Any animal that would be considered a child would grow up to become an adult.
The zoo would gradually become less welcoming to human outsiders before completely preventing them entry into the neighborhood that the zoo becomes. The anthros, regardless of initial species, would live in the zoo.
Bryan goes to click "Save", but then had another idea. He decides to temporarily forget about the Chronivac's existence and the changes that were to come. He also makes it so that the Chronivac would still exist on a computer wherever he ended up living. He would then experience the changes as if he had no knowledge of what was happening, while gradually finding it more and more normal. At the end of the week, his memory would return, and he'll be able to decide what to do next. He clicks "Save" and...
Bryan spaced out for a moment and took a step back from his work computer. He needed to get out of this office. Not that he didn't enjoy his job, it was just too predictable these days. What he would give for something unpredictable to happen sometime. He sighed and left the office, oblivious to what was coming for him in the week ahead.