Sherry at first didn't notice anything wrong, the Chronivac just displayed a progress bar slowing reaching 100% when she clicked the preset. She didn't actually read the preset, just clicked on one by chance.
"Huh, perhaps I'll go make a coffee while it's doing what ever it's doing." Sherry thought as she left the Chronivac running.
Getting a coffee and sitting on a couch in the living room, she sat their patiently waiting for the progress bar to complete. As the bar filled up however, changes already took effect.
At first, less notable changes. While sat on the couch, Sherry found her bra feeling minorly discomforting, but nothing alarming as of yet. Her breasts were slowly increasing in size, straining against her bra.
"Jeez, I think this bra is needs adjusting. I'll go to the bathroom to sort it out." Sherry thought as she put her coffee to one side.
Heading to the mirror in the bath room, Sherry took off her shirt and bra while stood in front of the mirror. She stood their slightly confused, as if something was amiss at her reflection.
"Was I always this big? And why do my breasts feel way more perky then usual, it sounds like something is sloshing inside them." Sherry mumbled to herself as she stared at her reflection. Some other things she though was peculiar were her large nipples and areolas, as well as seemingly being fatter then normal. Despite this, she didn't find herself quite alarmed at the moment. "I think I'll hit the gym. Pretty sure all that dessert on holiday is getting my belly bigger. I wonder if Bill would join me?"
Sherry laughed a little, as she decided to go to the gym in a few days. Trying, but failing, to get her bra back on, she gave up and just put her shirt back on while just putting her shirt back on. She went back to the couch where her coffee was and watched TV, forgetting about the Chronivac.
For the next 10 minutes, Sherry just waited and watched TV, not noticing her body change. Her breasts continued to get larger, while her nipples puffed up and lengthened. They reached about GG cup size while another pair of breasts began to form underneath her original pair. They looked identical to her upper pair, just a little lower down on her chest.
Fat began to build up all around her body, mostly in her chest, thighs and ass. Her added weight caused the couch she was sat on to begin creaking. Admittedly though, even with the ever more drastic changes, she didn't raise any alarms. It may be due to the fact that the Chronivac affecting Sherry's awareness temporarily as the changes were taking place. Sherry did however get alarmed when Bill came into the living room naked, causing Sherry to spit her coffee out.
"Bill! What are you doing? Your naked with the window open." Sherry screamed as Bill just looked at her absent-mindedly.
Bill didn't say a word as Sherry stared at him in shock. Perhaps the shock of him being naked, with people outside able to see him, made Sherry fail to realise that like her, he had changed too. Like herself, he had gotten plumper and more roundish then what he was previously. His body hair had grown a bit more and he lacked the shaven face he once had. His body was larger, and especially his penis and testicles her much bigger and hairy. Due to the Chronivac settings, Bill was not aware of the changes unlike Sherry (to a degree).
"Put some damn clothes on, your penis..." Sherry began to angrily shout until she looked at Bill's penis. Staring long at it, her subconscious thoughts changing due to the Chronivac. She did snap out of her trance as she saw the organ twitch, and Bill then urinate onto the carpet.
"Bill what the fuck? Why are you- wait the Chronivac!" Sherry realised as she remembered the Chronivac.
She ran, as best she could with her new body to the Chronivac. It dawned on her at this point that she had changed too, and cursed at the god forsaken machine that had done this to her. Failing at climbing to stairs bipedal, she had to resort to a quadrupedal stance, which somehow felt more natural then walking.
She got to the computer and looked at the screen, and got startled by what she saw. The present she clicked was dubbed 'Cow the human role swap' and the completion bar was only at 67% meaning that the changes weren't even close to being done. A new message soon popped up on the monitor, making her panic.
'Transporting User to suitable location. Please be prepared for special flux.' The screen read.
Sherry tried to reach the Chronivac in time, but found her surroundings spiralling away and leaving her in an open field with other quadrupedal humans, one of which was her husband and another was megan. Like her, megan now had two sets of breasts, long nipples, was fatter etc. The women in the field were like Sherry and Megan, while the men had bodies like Bill.
Sherry tired to scream and shout, but all that her mouth produced was a moo. She then went even to the edge of the field, and climb over the wooden fence that was their, but her hands weren't able to grab anything anymore. She was trapped in this field with no way out as far as she could tell.
Sherry looked around the field, seeing a barn way off in the distance, wondering if that could help her. She did see her husband just eating grass with out a second thought, and while disgusted, wondered if she could try to communicate with him to see if he had some awareness left.