Jessica was taken aback by the change in Nikki. But, once the shock had worn off, she discovered that she... kind of liked it. It was a sense of control she'd never had before, the ability to change another with just a click of a button. And Nikki would never even know! Nothing bad would happen (the reality change would make sure of that) and she'd be able to enjoy Nikki any way she liked.
And, if she was being honest, Nikki being this submissive pet was really quite hot.
But, Jessica was torn. On one hand, she was never really the dom in any of her relationships and enjoyed lovers who could overpower her. On the other hand, Nikki had begun her on a power trip, and she wanted to make the most of it. She hummed to herself until an idea popped into her head. Why not have the best of both worlds?
She went back to the Chronivac. She'd try a physical change this time. Adjusting the settings and parameters, she pressed start and quickly ran to the bedroom to peek in on Nikki.
As she ran, she could see the size of their apartment growing, ceilings becoming further away in a trippy effect that left her stumbling. She held onto the doorframe to right herself and drank in the sight of Nikki.
The submissive girl had begun to stretch out, growing taller with each passing second. She had surpassed 6'4 as she lay recovering from her orgasm and quickly reached 7 feet tall. But she was not skinny, no. Her body was packed with strong, powerful muscles that bulged out grotesquely against their leather confines, threatening to snap at any moment. Her chest heaved, bringing with it two slabs of pectoral muscle that would put Jessica's double ds to shame. A ten-pack of abs rose and fell just beneath, clenching and crushing its metal restraints within the superpowered muscle.
The 7'6 Amazon straightened as she snapped out of the afterglow, finding her stamina completely replenished. In fact, she could go again and again without tiring. Her smooth, ebony skin rippled as she simply ripped herself out of her handcuffs and stretched. Her breasts, now yoga balls attached to her chest - nipples impossibly long and hard, still pierced straight through and tugged to attention - stood perky and round, with no sign of sagging, nor implants. Her curly hair was pulled back into two space buns, and her face was slathered with slutty makeup. Her lips were two dark cushions that Jessica knew would feel like heaven pressed against her labia, and her tongue lolled out as a huge three-foot tentacle ready to send her to the heights of pleasure. Nikki turned and caught sight of her friend in the doorway.
"Mistress Jessica!" she called in surprise. Her entire face lit up as she quickly knelt before Jess, even though her body rippled with power and she could have easily torn the smaller girl in two. "Oh, did pet disappoint you? Did you not want your pet to relieve herself? Pet has been bad. Pet needs to be spanked. Or perhaps Pet's cock should be locked in a cage?"
Jessica blinked and looked down. Of course, her final change. At Nikki's crotch stood the most magnificent spire of man meat. Two feet of rock-hard ebony cock, twisted with veins and even the flattened head of a bull's cock. She certainly had the virility of one, if the cantaloupe-sized balls that rested on her thighs were anything to go by. It would be painful to get it all inside her, but god, did Jessica want to try.
Nikki was still looking at her expectantly. Jess cleared her throat. Right. "Yes, I think that my little pet does need to be punished. I think I'll try..."