You're a human named Will, with a 'hollowed' named Stephanie

You rest your back against the chamber, looking at the blonde girl across the way from you. She looked slim, but strangely not bony, which you didn't quite understand given you could see where her ribcage should be with her attire of merely boy-cut panties and a sports bra. Her long hair looked a little messy, but otherwise she seemed like a fairly normal person, albeit fairly petite in her hips and bust in a way reminiscent of a gymnast. Crossing her arms, she looked you up and down. "They really pumped you full of the knockout juice, huh? I've watched you for an hour, you didn't move a muscle the whole time, I thought maybe you'd expired... I'm Stephanie, Steph for short. And you are?"

Blinking, you shook your head again. This was extremely strange, having a girl calmly talk to you in such an alarming environment! "Uh... William. Will. I'm... what is going on here?" You looked around again, and then turned back to Steph. "What did they do to us?"

Stephanie wrinkled her nose a bit, as she looked away from you and over to another chamber. "To one of us. To me, in fact. It seems you won a coin toss after they paired us up. As far as I know, you're still a full, regular human. But me? I woke up after some sort of procedure and, well."

"Well what?" you asked as you quirked an eyebrow.

Tensed up slightly, Steph didn't seem interested in explanations. Instead, she turned around while pulling aside her longer blonde hair, and you could see the unusual feature that must have resulted from whatever she meant by 'procedure': where normally a spinal column protruded outward, Stephanie instead had a smooth back, save for what looked like an incision from the back of her head all the way down to the panties. You felt a chill as you looked at her, thinking that she had endured some sort of injury by the looks of the alteration made to her body. It seemed so unnatural! You couldn't help but let out a gasp at the sight.

Steph snorted. "You think that's weird? I haven't even started... Watch closely. And don't throw up or anything, I don't want to deal with a mess in here." She undid the back of her bra, freeing her back from fabric encasing her. With a bit of a grunt, Steph flexed her muscles, and the split in her back opened wide, like a mouth yawning! Her whole upper body seemed to distort as a result, drooping somewhat limply as her hands rested against the glass.

As promised--well, you didn't promise, but you still tried really hard--you didn't throw up. You did, however, yell. Mostly you just made noises for a while, before eventually your mouth began to finally form words. "What the HELL is that?!"

"My insides. Kind of." Steph looked over her shoulder, huffing a little as she looked down at her split-open back. Unlike what you'd expected from your anatomy classes in high school, there were no bones or guts inside Stephanie's body, but rather it looked like... more skin, somehow. Stephanie lacked an obvious skeletal structure or even typical musculature, which might explain somewhat why you didn't see things like ribs when you looked at her slender form, but it didn't explain everything, that's for sure! "I don't know all the details, so don't ask," Steph said as if she read your mind. "All I know is I am empty, stretchy, and on my own I'm extremely weak. Standing is about as much as I can manage on my own now, even that's a challenge. After I woke up, all I had was a few sheets of paper which said I'm a 'hollowed' and that, uh. You're supposed to actually get inside me, and 'wear' me, before we're shown Phase Two of something called Operation Unify."

You shook your head in disbelief. "Wear you? WEAR you? Look, lady, I just want to go home, or wake up from this dream, or whatever. I'm not gonna get inside you or whatever! Even if I was crazy enough to do it, I might be pretty slim myself but there's no way I would fit, I'm a foot taller at least! That wouldn't even work, no way."

"I just said I'm stretchy, didn't I? I'm designed to be worn by any other person, and to adapt to their shape, apparently." Stephanie closed herself back up, once again looking mostly normal, as she turned around and walked toward you, prodding a finger into your chest. "I'm not thrilled about it either, I don't want you in me walking around like my body is yours, but the paper said we have to go through the steps if we want to get out! I'll deal with some discomfort if I can get out of this stupid tube, it only unlocks if there is a single body in here. Look."

Stephanie pointed to a neighboring glass chamber where a pink goo slid down a man's throat, settling in his body. Once it did, the glass seemed to lift up, at which point the man looked around and bolted off into the darkness.

This felt so unbelievable, what you had just been told. Rubbing your nose, you turned back to Steph. "And if I don't?"

"If you don't wear me voluntarily, then I will have to **** you to do so somehow. And if that fails, then we don't make it out of here alive, I think. If you need a minute, then whatever, but I've already made my peace with all of this, and I want to get out of here."

You leaned against the glass again, feeling slightly ill about the whole idea of what was being requested of you. You were going to essentially have to assume this girl's skin, if not her form and perhaps even her identity, in order to leave this place. And she said she would **** you somehow if you didn't volunteer, even though you were sure you were stronger than her in this hollowed form where she didn't have proper musculature and structure to even do much more than stand. You could just refuse, and likely call her bluff, but is it worth it? From Steph's perspective, she's already endured a significant alteration to her life that undoubtedly felt beyond bizarre. In a way, you had the easy task, it seemed, since you still stayed intact. But just because the strangeness happened to her, why would you be paired with her for this project? Why would they want you for this project at all?

The tapping of a foot nearby broke you out of your train of thought. "Will, at least tell me if we're doing this the easy way or the hard way."