Small external testicles

Both Emily and Chris work late into the night. It takes perseverance and creativity, but they achieve all their goals. Chris finds a way to make the transformation much faster, while Emily programs up the best option to solve the sterility problem.

Emily discovers that the reason she hadn't grown testicles is that they would have interfered with her existing reproductive system. Over several hours she weighs different options that could resolve the conflict. She settles on external testicles right under her dick in a small scrotum above the vestibule of her vagina.

After completing the code they merge it into a single injection payload.

"Are you sure you want to go through with this?" Chris asks as he hands the syringe to Emily. "You got lucky the first time, but what if something goes wrong?"

"The nanobots seem to avoid doing harm by default. If we don't get it right we can try again. Considering all the billions of infections and virtually no deaths caused by the original virus, I'm optimistic I'll be okay." Emily assures him with a clinical detachment as she preps the injection site.

"The faster transformation is paired with pain blocker, so you shouldn't really feel it. If it does start to hurt, I'll be here with a shot of analgesic, just let me know if you need it." Chris tell her, holding the syringe of painkiller at the ready.

Emily tries not to roll her eyes. "You worry too much, but thanks." She says, injecting herself casually. She tries to pick up a mirror to see if she can watch the change, but before she can reach it her legs start to tremble and she collapses to her knees. "Oh fuck..." She groans with feeling.

Chris moves in with the painkiller, but she waves him off. "It doesn't hurt." She gasps, but can't keep talking. Her cock throbs and grows, becoming rock hard in a matter of seconds. It begins to twitch and leak precum as the transformation begins.

Emily pants, trying to catch her breath, but it keeps feeling more and more intense. "It's so good!" She manages to moan out, her body starting to shiver and quake. "Oh fuck, how does it feel so good?"

Chris stammers for an explanation. "I blocked the pain, but maybe it was so intense it started to saturate pleasure pathways in the process?" He guesses, kneeling in front of her with the injection ready.

Emily responds with a long keening moan as a scrotum begins to form at the base of her cock. Before their very eyes it begins to fill out, soon containing two healthy testicles. At the crescendo of her moan, just as the transformation finishes, she begins to ejaculate.

Chris was so transfixed by the growth of his boss's balls, he was caught completely off guard by her sudden emission. Her cock twitches hard, launching her sticky white load all over his chest.