Yutong, with a very interested look on her face

You concentrate on tilting your head down to look at Jane who is currently on her knees before you and stroking your dick, but halfway through the movement you can't help but open your eyes. As soon as you see Yutong, your eyes are locked on her.

Why did you even try to look at Jane? Yu needs you for her experiments, you couldn't let her down by only having eyes for Jane!

Right, the experiment. You really should continue to drink the delicious juice. You try to go a bit slower than Jane did so Yu's recording can show everything in more detail. Also, you want to prolong the experience as far as possible for yourself.

As you slowly drain the rest of the can, the fizzy sensation starts to spread from your tongue to the rest of your body. As it rises through your nose, you feel a pressure on its root, flattening it in a way you assume Yutong will find cute. You feel a pop in your ears as the insides of your face rearrange and your sinuses clear up.

Your hair tickles the back of your neck, then all the way down your back as it grows and lengthens. At the same time, the same fizz goes down your spine, causing it to contract and your torso to shrink.

At this point you're done with the soda, and look down at yourself to enjoy the rest of the changes. The tingles spread down your arms, leaving them slender, smooth and agile. You also notice that their skin color has shifted from your usual pale tone to a khaki shade not unlike Yutong's. The sensation concentrates in your fingertips before fading and leaving your nails nicely manicured and painted teal.

You feel another set of changes flare out from your nipples, at first a tight feeling almost like in your penis (which Jane is starting to kiss and lick now), then a swelling of the area around them. The growth is not nearly as pronounced as with Jane, but as you reach out to cup them in your hands you can't help but gasp from the increased sensitivity.

The changes race downward, pulling in your waist and widening your hips, before the feeling centers in your dick. The simultaneous stimulation of Jane's kisses and the soda-induced changes is too much for you, and you can't stop yourself from ejaculating. Jane responds quick enough to catch most of your cum in her hands, and proceeds to lather your still-stiff cock in it. What normally would be painful for you turns out to be even more pleasurable as she starts to take it into her mouth and lick off the cum like ice cream off a popsicle.

Even more like a popsicle, your dick becomes shorter with every lick, it feels like you're melting in her mouth. The intensity is almost too much to bear for you, being unable to cum again in such a short time, and you're almost relieved when there's nothing more for her to lick away.

That doesn't mean that she's done, however - an opening has formed where your balls had been just a moment ago, and there are some novel sensations shooting through it as Jane explores its insides with her tongue. All of it is too much for you, and you have to support yourself with your hands on the soda machine behind you as your knees weaken and an orgasm flows through you.

When you're done moaning and panting, Jane stands up and looks down at you. "So Cyan, what exactly did the soda do? I haven't noticed any obvious changes, but you enjoyed yourself more than I expected."

Wait, Cyan? That's not your name... Your name is...

Your name was Chase Wallin, but now your name is Chi-An Wu, or Cyan to your friends. Still, why does Jane not notice?

You turn to Yutong, who smirks at you. "I might have left the WTNS setting off for this one so Jane doesn't get disappointed."

"Wait, why would I have been disappointed? Cyan is the love of my life!"

And Yutong is yours. She's so smart and cares so much for you, you want to explore many more changes together with her. Although you have to ask her, "What exactly does this mean for our relationship? If Jane is still my girlfriend... do you even like women?"

"Oh believe me, I'm very interested in your body."

You blush. "Are we together now? Is Jane still together with me?"

Jane answers that question for Yu. "Of course we're still together! Just because you're Yu's exclusive guinea pig doesn't mean we can't still do... some stuff." She punctuates her claim by reaching down and rubbing your pussy lips.

You hope she's not wrong. You love Yu, but Jane is still the girl of your wet dreams.

Yutong confirms Jane's claim. "That's right, my little guinea pig. And I'm sure you're gonna love the drink you're trying next!"