Christine and Thomas were really close friends, actually, friends with benefits, with Thomas obeying Christine's orders as she was the dominant one, coming with kinky and weird ideas.
Then one day they discovered ANIMALIA INC and its transformation services, they didn't doubt a single thing and immediately talked about it, knowing what their transformations would be after some minutes. Christine wanted to go for a light-blue anthro kitsune, she loved the elegance of Japanese culture as the dominant appearance of a fox woman with many tails. Thomas on the other side wanted to be a red kobold, a species known as anthropomorphic dragon of small sizes, but he wanted to go even further, as the transformation center indicated that you could modify your age he wanted to be 2 inches tall, which actually was Christine's idea.
Now in the transformation center the couple explained their situation and details to one of the employees dressed as a nurse. "Oh! Some pet play right?" Christine nodded as Thomas blushed, "sure, you're not the first ones to do this, before we start the first phase I'll need you to sign this" the employee gave Thomas a sheet of paper having to sign it at the end, it stated the he would legally become Christine's pet, he gladly did it as Christine grinned while observing. "Everything done, now follow me"
Both were guided to a private room where they needed to take off all their clothes, the woman attending them appeared with two syringes, one with a female fox icon printed on it and the other a male kobold, the kobold one seemed to have a bit of extra liquid as it was mixed with an extra size change chemical.
"You should know a few things, first there no coming back after this" the nurse-like woman explained, Christine and Thomas nodded. "And second I noticed that one of you will shrink to a really small size, you should know that doing some stuff like prolonged vore of any kind, digestion or anything involving one of you inside the other's body for long periods of time could end in some unexpected results."
"Understood!" Christine showed her arm recieving the injection. "Are you ready Tommy~"
"Yes! More than ever Christy!" Thomas said in excitement as he received an injection too.
"You won't need to call me like that anymore, I'll be your mistress so you should stick to that name" Christine said in her sensual voice, just by hearing her Thomas had and erection.
"Everything done, those should take effect in some seconds, I'll give you some private time"
After the woman closed the door Christine was planning to make some conversation, or even getting intimate with her partner but the effects were really fast. She saw how the light blue fur grew through all her body but with white fur as her belly and the lower part of her head, her anatomy changed drastically with her head changing into the one of a light blue fox, nine tails grew above her butt and her legs shaped themselves assimilating the form of a canine, if that wasn't enough, three additional pairs of nipples popped below her two E cup breasts.
Thomas stared at his mistress in amazement, looking the wonderful anthro vixen she turned into, he was next. His body replaced his skin with red scales, growing a reptile tail at the same time, his head changed like a draconic one but it looked more innocent than the furious mythological beast, his transformation was almost done, he saw how everything was looking extremely big but in reality he was the one shrinking, until he was 2 inches tall as he and his mistress wanted.
"You look amazing Tommy~" Christine said looking at the floor with her scaly servant on it, she extended her finger to make him hug it and raise her hand in front of her face.
"You too, mistress!" Thomas the red kobold said, admiring his foxy master.
"We're going to have so much fun now~" Christine moved Thomas to her right shoulder, following the path to their home and look at all the things they could do with their new bodies.