The Chronivac simply displayed the progress bar of the transformation as Jeff simply watched it slowly move. He had no clue what kind of animal he would, all he knew he would become the pet of some kind. At the time he pressed enter, he didn't think of how the Chronivac would do its work. Not every house already had a pet around. But now, he grew bored waiting.
Jeff's house had only one other human home, his younger sister, who was something of a brat. Their mother was out running errands and their father was still at work. Much as he liked furries, his parents wouldn't let him or his sister have any pets that could run around. The nearest dog he knew of belonged to the neighbor. He didn't have a pet of his own, not after the goldfish incident, but his sister did.
He headed downstairs to get himself a snack, figuring it didn't really matter where he waited for the changes to occur. On the way down the hall, he peeked into his sister's room,. He hadn't thought about what she might become, focusing only on himself...or even if they'd end up the same species.
He looked inside, not seeing there...wondering where she was...had she already changed? What was taking so long? Suddenly, he stumbled back...as the room seemed to grow to gigantic proportions...or maybe it was him shrinking. He suddenly was standing there, totally naked, inside a pile of his clothes. He struggled out of them and stood there, looking up at the bed, which felt as tall as a house to him.