Rukia could not believe how she got into this. Sure, she remembers how she got into this. Rangiku from the Tenth Division had convinced her to drink alcohol, and somehow, this had led to a bet that she lost. Worse, the other divisions had gotten involved in their game, but she managed to take care of their bets.
 
All except the Twelfth Division; the R&D Division, home to Mayuri, the mad scientist who probably wouldn't deny being one. And unfortunately, the man was mad enough to use test subjects that weren't animals.
 
"Who's there?" It looks like the mad scientist was in another part of his division. Rukia let out the breath she held.
 
"I'm Rukia from the Thirteenth Division. I'm here to-"
 
"Yes, yes, a bet. There's a gigai on the table in front of you. I want you to test it out." Rukia looks at the table. Sure enough, there was a sheet covering what looked like a body. Rukia peeled the cover away and had to stifle a gasp.
 
A gigai was essentially a fake body used in the living world. Sure, it was made to be as real as possible, and usually, they were possessed by shinigami like Rukia most of the time. However, this certain gigai resembled her living friend Orihime. Orihime was a strawberry-blonde who was a head taller and had breasts as big as her head.
 
...Compared to the black-headed Rukia, who looked down at her meager chest. "Why is it modeled after..."
 
"Well, what are you waiting for? Get in that body!" Rukia could have sworn she heard the mad scientist pause and think. "Don't do it here! Go to your home or something."
 
Rukia quickly brought a blanket to hide Orihime's nudity, even if she wasn't the real thing. She had spent minutes trying to carry Orihime out without exposing her flesh, and that was when Rangiku found Rukia, helping the girl carry the body to her home.
 
---
 
"A gigai, huh?" Rangiku runs her hand over Orihime's body, giving one of her boobs a squeeze. "It feels much more real. Still, I can't believe you got off easily."
 
"I think his definition of easy can be saved for another time." Rukia shivered as she remembered when the Twelfth Division created their own version of Silly Putty. "Besides, I can't phase into the body. It doesn't seem to be working like how it does."
 
Rukia pats the body to demonstrate how solid it is. Rangiku hums as she helps Rukia search the body. They couldn't find a button or hatch, but then Rangiku reached down to Orihime's vagina and stuck her finger in. "Ra-Rangiku! What are you doing to her!?"
 
"Relax, she's a gigai, remember?" Rangiku wormed her hand into Orihime's cavity, then she pulled her hand out and slipped it into the gigai's ass. She nods to herself as if she made an important discovery.
 
"Well, her bottom is quite loose." Pulling her hand out, Rangiku wiped her hand on her robes, much to Rukia's disgust. "So, ass or womb?"
 
"Ass or wo-" Rukia's eyes widened. "You want me to go in her ass!? Isn't there another way?"
 
"Couldn't find it, and we were all checking her body." Rangiku grinned as she saw Rukia fidget where she sat. "Besides, you lost the bet, and you don't want to make the mad scientist madder, do you?"
 
Rukia was actually thinking to make the mad scientist madder by running, but things could easier get a lot worse for her. "Next time you bring me drinking, I'm going to punch you in the face."
 
---
 
Rukia grumbled. Not only had Rangiku convinced her to strip naked, but she also handed Rukia stick of butter to lube herself up. At least Rangiku had already closed the blinds, Rukia mused as she rubbed the last bits in her hair and then stepped back into the room. She didn't like how Rangiku was eyeing her. "Alright, let me crawl into her womb."
 
"Ass." Rangiku corrected. "You said ass first, so you're going in her ass."
 
"Really..." Rukia could feel her eye twitch. "I'm going in her womb."
 
Rangiku held a hand to her chest as she spoke in a mocking dramatic voice. "Oh woe, you don't just take a girl's virginty, but also deform her body? What would your dear brother say if you got her pregnant?"
 
"You're the one saying she's just a gigai..." Rukia countered before she sighed. "Fine. I guess she's clean either way."
 
Rukia took a look where Orihime had been positioned. She was slumped over the edge of the bed, still naked as the day she was made. It also appears that Rangiku had also buttered up Orihime's hole, and the image Rukia had of the actual girl would have been ruined. Rukia spent her last few seconds cursing any other god she knew and then slipped her hand in.
 
---
 
Rangiku looked at Rukia. "Well?"
 
"Look, I'm reaching into a replica of my friend's ass. I'm not comfortable with this." Rukia countered, not taking her hand out yet.
 
"Don't think of it as violating your friend, think of it as hiding in your friend." Rukia shot a piercing glare at Rangiku's joke. "Um, I guess that joke ended in poor taste."
 
"Rangiku, shut up and help me in." Rukia slipped her other hand in and Rangiku wasted no time pushing her friend in. Rukia ducked her head and her arms helped slide that part inside, though she was hit with a strong scent of...lavender? Probably something Mayuri put in.
 
Rukia managed to move her arms as she slid in further, and she slid them down, managing to find the entrance to her prison. However, as Rukia managed to get her hands out, she felt feminine hands pull them behind her back and then tie them with some sort of cloth.
 
---
 
Rangiku could not hear the muffled shout of her friend as she tightened the knot. Not that it would matter, as she gave one more shove so that Rukia's hands disappeared into Orihime's flesh, leaving only the other half of the small girl's body sticking out. She quickly jumped back as Rukia kicked wildly, but it was merely jest to her as Rangiku flipped Orihime over. Instead of seeing a round balloon, Orihime's belly look flat. Orihime's body was not entirely flat, though, as Rangiku could see one portion move around. It took longer to find where Rukia's chest would be. "Wow, I can barely make you out. Let's hope the real one doesn't sit on you."
 
Rukia clearly heard her, for her kicking resumed. Rangiku had to grab both feet and keep them still. "Give it up. There's no way you can move in and out, and I'm the only one around. Do you really want people to see your legs stick out?"
 
Rukia's legs stilled. Rangiku took this answer as a no. "Good. Don't resist, or I'll swat that ass of yours."
 
Rukia's only job was to stay still. First, Rangiku had simply tied her ankles together. She then pulled on the girls' feet, and Rukia could feel cool air brushing over her bound hands. Of course, Rukia had resumed struggling when she realized Rangiku only did that to bend her legs and tie the two bonds together, but Rangiku was quick to swat. Since she wasn't flipped over, the hand stung Rukia's crotch, and she dared not to move.
 
After a tug on the ropes, Rangiku approved her simple hogtie and rubbed Rukia's clit. "Sorry about that. Now, be a good little baby and let mommy do her work."
 
Rangiku flipped Orihime onto her belly, and then Rangiku pushed on Rukia's ass. The smaller shinigami could not move around much, and it wasn't too long for her hands and feet to disappear, followed by the rest of her legs. Rangiku's only regret was that Rukia went head-first as the caps of her knees were swallowed up by Orihime's ass. Flipping Orihime once more, she tried to recall where Rukia was. It seems, though, that Rukia's only feature had already disappeared in the other girl's larger bust.
 
"Hm...I wonder if tying her up hampered her ability to move."
 
---
 
As she pondered this, Rangiku spied a Hell Butterfly, the main communication device that just so happens to move around like one. She wondered if her captain was calling her.
 
"Is Rukia there?" Rangiku blinked in surprise as Mayuri's voice flowed from the butterfly. She wasn't sure if it was a recording as Mayuri continued on. "You still haven't picked up that gigai yet. Honestly, do I have to be in the same room to point out the difference between a fake body and a random girl I sedated? And while we're on the subject, you wouldn't happen to have seen her walking about, have you?"
 
"S-Sedated?" Rangiku's mind sobered up as she connected the dots. And then Orihime yawned.