OP here. I only wrote the first chapter, but I guess it's time to pick this back up, since I quite like the way this story has evolved.

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Alyssa patted loose front cover nervously as she left her room. She could feel the seams through her T-shirt, and her fidgeting had probably made it worse. Oh well, if it fell off while she was seated, she could just hold it in her lap. But as she walked, the chewed snack bar swaying in her cavity, the sound of crackling plastic gave her pause once again. Just as she was considering just taping her pussy and asshole and using her body as a container, she lifted her nervous gaze to see Jim standing in her path, sporting a knowing smile.

"You're not going to dinner like that, are you?" he said.
"Huh?" Alyssa looked down at herself, blushing. Had she forgotten something obvious while trying to salvage her anatomical situation? "I, uh, I'm kind of forgetful when I get distracted--"
She stopped abruptly when she saw what he had in his hands. "No kidding. It'd be no fun to go to dinner without one of these," he said, holding up a stomach attached to a coil of intestines which he had wrapped around his hand.
Alyssa gaped. "How did--"
"You were kind of translucent earlier, without the clothes I mean. And the way you walked—well, it suits you, but let's just say it looks like quite the balancing act.”

She blushed some more, her fears during her earlier attempt at concealment having been confirmed. Rather than try to explain herself, she took the opportunity to change the subject, which Jim had so graciously provided her. “Where did you get that?”

He patted his belly. “Cut it in half, and sealed them both up. I went for an even split, and I also took out some intestines for the full digestive experience. Here, catch!”

Alyssa, still stunned, almost let the slippery mass bounce off her, but after some stumbling, she held her salvation in her arms. “Whoa. I really can't thank you enough, I mean, you didn't have to, it's all my fault for playing around with--”

She was interrupted by the sound of her abs hitting the carpet. Reminded of the urgency of the situation, she gave him an awkward smile and began trying to ride up her shirt with her elbows, her future insides threatening to spill out of her hands. It didn't occur to her to ask for help, given her rather special domestic situation, but soon, Jim was behind her, holding the rim of the shirt at her chest level. Alyssa tore the plastic bag from its perch, throwing it in the path of a passing cleaning bot. She held the esophagus against the top of the organ with one hand, grabbed the length of bandage which Jim was holding over her shoulder with the other, and fastened it tightly. They repeated the process with her rectum, and finally her front cover, which was beginning to look bruised, and, letting down her shirt, Alyssa turned to face Jim and gave him a quick hug before she ran down the stairs.


***

Alyssa was ravenous, which was to be expected after literally emptying herself for a day. She was so relieved to have a stomach again that she nearly forgot about the rest of her missing organs. She wasn't really sure how everything connected, but if she didn't need them all to enjoy this steak, it could wait.

“My, my. If you'd told me earlier how hungry you were, I would have brought you something before I left. We packed snacks, remember?” Nevertheless, she was glad to see that her daughter's brooding aura had lifted as she happily shoveled food into her mouth.

“I guess I just had an upset stomach,” said Alyssa between helpings. Given what it would take to upset a stomach, this excuse was as good as a confession if taken literally, but her mother's experience as a parent had taught her to turn a blind eye in these instances.
They discussed what Alyssa had done while her mother was away, and Alyssa mentioned making a new friend while omitting any bits pertaining to her anatomy. Patting herself again, she decided to go easy on her stomach next time.
Patting herself a little lower, she wondered what she would do for her date tonight. Their last encounter had been... intimate; he was practically inside her already (though the stomach was as good as hers now, thanks to the standardized biological program interface). Better not to overthink it, she decided. Dates are supposed to be spontaneous, right?


***
Eight o'clock.
Her half-size stomach was practically bursting by the time dinner was over. She had to empty her bowels immediately afterwards, finding that a half-sized intestinal tract had some unpleasant side effects, which she flushed with her eyes shut. When she stood up, she felt a pinching sensation. Looking down, she saw that a bit of intestine had slid out of her vagina while she sat, lacking any obstructions on the way down. Shoving it back in with her fingers, she felt it fall right back against her inner lips. Not wanting to loosen herself trying to push it back further, she decided that the next order of business was to get back in one piece. She always took being whole for granted, but bodily malfunctions always reminded her of how delicate the whole affair was.

Back in her room, she took inventory. Her bed was how she left it, and for once, her organs hadn't been tossed out behind her back. Firstly, her gaze landed on her uterus. It lay with its ovaries crossed, as if indignant at being uprooted. Alyssa pulled her shirt over her head and removed the bandages from her midriff, prying herself back open. It was a shame to tear the partially regenerated skin in the process, but it was still the path of least resistance. Taking the roll of soluble bandages from her back pocket, she went to work, until her vaginal passage led where it was supposed to. She would rather not find out what the prolonged absence of a bladder or kidneys would do to her, since everyone would throw those away if it just meant never having to pee.

Alyssa could still feel some hollow spaces, and knew she was still missing some bits, but she'd done her best at this point, and felt ready to relax for a night before worrying about replacing them. She'd taken care to tape her “lid” back on from the inside (to the best of her ability), so she didn't look like a patchwork abomination without her shirt on. Finally, she slipped into a tank top, and, examining her pants, which might as well have been pajamas, she replaced them with a tight pair of shorts. She reveled in tightness now that she wasn't at risk of imploding.


***

Ten o'clock. Alyssa had arrived first, pretending to read the labels on the encased food items while glancing at her watch. She didn't have to wait long; a familiar voice greeted her from behind, and soon they were face to face once more.

“How did you like it? Did my stomach manage to stay put for you?”

“Yup! It definitely beat having to pretend-eat into a plastic bag while I was literally starving.” She paused, then nervously added, “You won't be needing it back, will you?”

Jim laughed. “By tomorrow, we'll both be back to full size, so why fix what isn't broken?” He furrowed his brow. “Speaking of which, how did you end up like that in the first place?”

“Uh, it's kind of embarrassing. Have you ever picked at a dry lip, but always found that there's that little extra bit sticking out, until the whole thing is raw? Well, this little part of my guts was sticking out... and, um, the car ride was really long...” She thought about how stupid that must have sounded, and wished she'd made something clever up instead.

“So you just can just tear yourself apart out of boredom?”

That's it, he thinks I'm a freak, she thought forlornly. But he continued,

“Well, why should people get so squeamish about that stuff? We can handle way more than what's socially acceptable. Our bodies are so cool, why can't we have fun with them?”

Alyssa wondered if that was her motivation all along. Had it been fun to disassemble herself? Parts of it had certainly felt good. She thought back to her numerous experiences with being in pieces. Picturing her body sprawled in impossible ways, with her limbs scattered across the bathroom floor, remembering the unique sensation of pressing against a severed body part as the feeling begins to flow through it. Before long, a tingling alerted her that her nipples were standing conspicuously erect underneath her tank top.

Maybe it was time to embrace it.

“I guess, yea! I'm not afraid to play rough. I've had plenty of practice with my brother growing up.”

Jim looked slightly jealous. “Oh. I'm an only child. I've always wondered what it would be like to be that intimate with somebody...”

“Trust me, it has its downsides,” said Alyssa. “And we aren't really intimate so much as used to each other. And used to breaking each other.”

“So if we were to try it--”

“I kind of want to enjoy being in one piece for a while,” she said, stretching. “I have you to thank for that, though, so I totally owe you later. So, wanna hit the arcade?”

Weird girl. She'd rather play games right now than be dismembered? Well, whatever, there's something here for everyone, he thought, following.