Published: Jul 8, 2024

My one-hundred and thirty-third caption, this time featuring a slow transformation into someone's ideal companion. Who's definition that is… well, you'll find out.

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All image credits go to their respective artists. I have and never will claim ownership over any image I've used or modified for a caption, and I always encourage you to check out the artist and their wider body of work when possible.

Built mainly with a surplus of recycled parts from older Hunter/Killer-92 military androids, KD-R492, whom the self-proclaimed genius Dr. Stefan Meckler had affectionately named “Kaydee”, was constructed from the ground-up to be his ideal soulmate. Eternally young and beautiful, she wouldn’t age a single day, cheat on him, or break his heart. He spent weeks working on her program before inserting her hydrogen fuel cell, making sure absolutely everything was taken into consideration. After all, her program couldn’t be changed once it was locked in, not without erasing her entire personality. That was completely unacceptable.

When he finally activated Kaydee though, something about her seemed… off. Though she was outwardly cheery and followed all his commands, she wasn’t nearly as warm and welcoming as he intended when writing her program. He theorized that she simply had to “settle” into her personality and build up a proper baseline before it would “kick in”, but this theory seemed to be less and less likely as the days went by. Finally, two weeks after Kaydee’s activation, there was a “breakthrough” of sorts. Kaydee began expressing great interest in a series of cybernetics Stefan had been developing on the side, many of which used the same exact Hunter/Killer-92 parts used in her own construction. She seemed fascinated with them, and began suggesting that he begin using the experimental implants to “upgrade” and “improve” himself. Stefan would have normally never considered such a thing, putting experimental and untested equipment directly into his own body, but he noticed a “glint” of sorts in her eyes as she urged him to do it, a spark of humanity she hadn’t fully expressed before. It was genuine, and he loved it. He agreed, hoping this might finally be the thing that fully awakened the side of her personality he had been trying so hard to bring to the surface.

The changes started off slowly, with Stefan adding implants to less-critical parts of his body that affected things such as endurance, dexterity, and other bodily functions. Though Stefan never considered himself much of a “body modder”, as they were known on the streets, he began to enjoy the increased levels of energy and strength he felt with just this handful of implants. What really ended up surprising him though was how absolutely ecstatic Kaydee was about him being implanted. She looked at him with such pure, loving eyes that it didn’t take very much “convincing” at all to get him to go further with more of them.

Trusting Kaydee and her superior accuracy and reflexes, he allowed her to put him under and insert a “stem interface” directly into his skull. It was a “jumping board” of sorts for more intensive implants that required a direct neural interface to function properly. Though he had done some work on the stem interface before, Kaylee had actually been the one to finish it and write its subroutines, leaving him quite impressed. In fact, it was quite similar to her own interface ports, which had been used on the old Hunter-Killers. Waking up several hours later, he felt a little bit of pain, but he was shocked by just how… clear his thoughts seemed to be. If properly installed, a stem interface essentially became part of your brain, even assisting with the transmission of it’s electrical signals. After a few basic tests administered by Kaydee, he found his thoughts to be flowing longer and faster than ever before, and Kaydee couldn’t have been happier.

Over the following months, numerous further implants would be inserted into Stefan’s body, becoming more invasive and extreme as time continued to pass. At first it was things such as occipital replacements and further cranial implants to improve his memory, but soon Stefan was having Kaydee replace whole organs inside his body, including his stomach, kidneys, liver, lungs, and many of his glands. As this was happening, Stefan’s frame began to slowly decrease in mass, making him lose height and gain some fat in places he had never had it before. Still, he remained blind to these changes, wanting to please Kaydee above all else.

Eventually, things reached a point where Stefan was more machine than flesh. Sure, he still had his skin and other outward features, but his insides had pretty much all been replaced with mechanical or cybernetic versions, with the exception of his heart and his more… manly features. Of course, Kaydee insisted he even get these replaced, having developed a fully-functional artificial heart that was completely resistant to EMP and other trauma. As per usual, she showered him with praise, touting great satisfaction with his progress while expressing pride in her own skills. It wasn’t long until Stefan had been put under once more.

Many more hours later, Stefan finally woke back up, but things felt quite… off. His whole body tingled in a weird way, like pins and needles, and his skin felt more… taut. Looking forwards, he then immediately came face-to-face with two large breasts, breasts that belonged to him. “Adrenaline” shot through his body as he stood up, finally seeing the full extent of his changes. He grabbed for his crotch, and immediately realized how far the changes had gone. He was no longer a man, but a busty woman! Even more shocking though was the fact that his “skin” actually seemed to be some kind of polymer now, rather than human flesh.

“Oh my, you’re finally awake!” Kaydee greeted loudly from behind, shocking the former man as she grabbed the “fat” along their waistline. “Hi, master!”

“K-Kaydee! What is the meaning of this?!” Stefan shouted, “his” face going red as their new synthflesh simulated a blush. “What have you done to me?!”

“Oh Master, don’t be upset! Your upgrades are finally complete!” Kaydee reassured, her own face going red. “You should like it! You’re so cute!”

“Kaydee, how does turning me into a woman classify as an ”upgrade”?! I did not agree to this!” Stefan argued, struggling with the new sensations.

“Well, you programmed me to love, care for, and protect you, silly! This was obviously the best way to accomplish all those criteria!” She began to explain, acting as if this was all normal as she grabbed their breasts. “I couldn’t love, care for, and protect my master properly when he was a fleshy human, so I did the next best thing and made you like me! With your new body, we can both be eternally young and beautiful! Doesn’t that sound nice?”

“T-This isn’t right. Not right at all! Th-those old military parts I used to build you must b-be interfering with the program I wrote!” Stefan theorized, trying to pull away from their now very clingy creation in a panic. “Kaydee, commence emergency shutdown! Code Alpha Zet-”

Stefan’s commands were cut off as Kaydee connected directly to her Master’s stem interface, flooding the newly-minted android’s artificial brain with the machine equivalent of endorphins. Stefan stood there, staring into space and “drooling”, as Kaydee walked back to him and put an arm around her with a big smile.

“Don’t worry, Master! I’ll help ease you into things!” She reassured, grabbing the excess synthflesh she had left on her Master’s abdomen. It, along with the larger breasts, had been the two “liberties” she had taken when designing her Master’s new body. “I think you should be Stefanie now!”

“That sounds nice…” Stefanie blissfully agreed, her whole mind having gone blank from her body being turned into one big erogenous zone.

“Relax, you’ll love being like me, Master!” She said as she continued to grope her. “We’ll be together forever now, and nothing will separate us.”

“Thank you, Kaydee…” Stefanie accepted through the haze, unable to muster up the will to stop her anymore. She was the Master now… always has been.