Shinju wanting to cosplay Soma was one thing, but the biggest obstacle was that massive pair of pectorals!
Back at home, Rin searched for "crossdressing" techniques on his computer.
Male-to-female is an additive process—simple enough. If you lack something, you add it.
A flat chest can be fixed with prosthetics. There are even items to hide male characteristics; as long as they aren't seen directly, it's hard to tell even if touched through fabric.
But female-to-male is a subtractive process. No matter how much you hide them, the mountains are still there. You can only try to minimize them by adjusting the body's curves.
Orie was much more professional than Rin in cosplay matters, but her experience was with "cute girls." Her designs were focused on being cute and erotic, highlighting the female silhouette. Hiding it was outside her expertise.
And Shinju was a G-cup!
Normal chest wraps or binders wouldn't work. Rin found online that only professional-grade, full-compression binders could even stand a chance of flattening her.
Regardless, Rin first ordered the binders and the cosplay uniforms in Juju's size (to be modified) online.
Rin: [I bought the binders and uniforms online. I'll bring them to you to try once they arrive.]
Shinju: [Okay.]
Shinju: [Thanks for the trouble.]
Shinju: [Um...]
Rin: [?]
Shinju: [Are you free tomorrow, Big Brother? I want to see if I can wrap my chest with bandages.]
Rin: [No problem.]
Rin was quite busy lately. Besides the drafts for Orie, Akane Kosaka had arranged for him to meet an editor in two days to discuss Mashiro's manga. The following weekend was the book launch for Elf and Utaha, and Kessoku Band had their music festival audition to determine which rookie bands would actually make it to the stage.
After the audition, they had to focus on the galgame project. Nanami would start her voice recording for the heroine, and they needed to leave time for debugging and printing the physical discs.
Come to think of it... the samurai armor he commissioned for Miku was almost done. Movie props had to be high-quality, so it took longer. It would be a perfect gift for the Winter Comiket.
The weather was turning cold, with only a month until winter break. After the break, the university entrance exams would begin. Utaha, Hinata, Saya, Ryo, and Nijika were all preparing for college. Rin had even promised Hinata and Saya a small "wedding ceremony" if they passed.
Rin was free tomorrow, but... a chest-wrapping test could easily wait until the binder and uniform arrived.
Shinju specifically asking to try it before the gear arrived... Her goal likely wasn't the bandages at all. Shinju and Juju really were sisters; they seemed to be thinking the same thing.
Rin's lips curled into a delighted smirk. Well, time to draw for a bit.
The next day.
Rin skipped the studio and met Shinju near her school right after she finished classes. They headed to the hotel together.
Inside the room, Rin tossed his bag onto the sofa and looked at Shinju with a smile. Under his "all-seeing" gaze, a guilty Shinju lowered her head.
"I brought the bandages. I also brought one of my own shirts... want to try them now?"
"Eh... mmh." With her cheeks flushing, Shinju bit her lip to endure the shame as she unbuttoned her sailor uniform and removed it.
Today, Shinju was wearing a white lingerie set with cute blue lace. The pure, innocent underwear paired with her blushing face was exceptionally erotic.
With a soft snap, the front-clasp bra holding her G-cups was released by the incredible pressure. She kept her eyes low, not daring to look at Rin, but her gaze was shamelessly fixed on his trousers.
Without covering her chest, the downcast Shinju spoke in a whisper.
"Big Brother... help me put them on. The bandages... let's try."
Rin didn't reach for the bandages. Instead, he walked over to her.
"Bandages are actually quite bad for you. They reduce volume through brute force wrapping, but that pressure can crush your ribcage and make it hard to breathe... You've probably tried it before, haven't you?"
"!!!!!"
Hit right on the mark, Shinju trembled. She had been insecure about her body since she was a child; there was no way she hadn't tried binders or bandages before.
So the bandages were definitely an excuse... Recalling Juju's situation, Rin had a daring theory.
While she was stiff from having her secret exposed, Rin gently pulled her into an embrace and brought his lips to her ear.
"Shinju... do you want me to 'eat' you?"
"!!!!!"
Rin could feel her body shaking uncontrollably, her eyes becoming watery and unfocused.
Rin didn't say more, just gently stroked her back to comfort her. After a while, when she seemed to calm down, he continued.
"Is it because I've given you plenty of 'proof of charm' but haven't actually taken you? You think I'm just being polite and that I actually hate your body, don't you?"
"I... I... mmm..."
Hearing her answer, Rin let out a helpless laugh. The older sister and the younger sister were at opposite ends of the physical spectrum, yet their thoughts were identical.
"So... you want me to eat you now, right?"
"...Mmh." Shinju took a deep breath. "I-If Big Brother doesn't mind... then eat me."
"Of course I don't mind. However..." Placing his hands on her shoulders, he pushed her back slightly, a glint of mischief in his eyes. "You're cosplaying Soma, and I'm Sakuya. Since we're both 'boys' for this, we can only use the 'other' side."
"EH? EH-EH-EH-EH!?!??"
Shinju was genuinely shocked. She didn't read BL manga, but she had seen "rear play" in Rin's doujins... Thinking about it, it made a lot of sense!
Flower Princess was a G-rated show, so they couldn't show it, but after Soma and Sakuya became a couple, they would surely do that kind of thing. They'd definitely use the rear.
"The rear... is dirty."
Shinju whispered. It was a place for the bathroom, after all. She still hoped Rin would eat her normally.
"For Shinju, it won't be dirty... and if it is, we'll just wash it!"
"This..." Shinju bit her lip. After hesitating for a long time, her face turned scarlet and she slowly nodded. "I-If Big Brother wants to... then... okay!"
Plan success!
It wasn't that Rin had a specific obsession with the rear. In fact, he used the "waterway" much more than the "dry road." He chose this purely for Shinju's sake.
Shinju wanted to be "eaten" because she lacked confidence in her body. Back at the KTV, Marin and Moeha were there, so she could understand why he didn't take her then. But even the other day when they were alone at the hotel and she served him with her chest... he still hadn't taken her, only leaving "proof of charm."
Rin was using a "dirty" place like the rear to prove to Shinju that his attraction to her wasn't limited by her body type.
But it was all a misunderstanding. If Marin's message about Juju hadn't interrupted them the other day, Rin would have gladly taken her then.
Now that Juju had asked to have her rear developed, Rin found it very entertaining to develop both sisters' rears simultaneously without either knowing.
With that thought, Rin continued.
"Shinju, you've seen my manga. Usually, the protagonist just gets right to it. But that's just manga logic; we skip a lot of steps. In reality, it needs to be cleaned first."
"Phew... when you said it wasn't dirty, I thought you were going to go straight in..." Shinju patted her chest and let out a sigh of relief, smiling bashfully.
Rin took her hand and led her to the bathroom.
"Even if it's clean, we can't just start. For both men and women, that area is delicate. It needs to be developed first... I happen to have a set of tools here. First is the cleaning... it's simple, I'll teach you."
The cleaning process was too shameful for Rin to assist with once he'd taught her the basics, so he let her handle the interior herself. After that, Shinju took an extremely thorough shower.
Rin waited for over an hour before Shinju finally emerged from the bathroom in a robe, fidgeting.
"B-Big Brother, I... I'm ready."
"Ahem..." Rin cleared his throat. "Lie down then. I'll use my finger to check your tolerance first. It's like a medical exam at the hospital."
"O-okay..."
The bashful Shinju, just like her sister, grabbed a pillow and buried her face in it, assuming the "OR2" position with her butt in the air... Rin noticed it was even the same pillow.
Even though the pose and the pillow were identical, their bodies were very different.
Juju was incredibly slender; Rin could feel how tight she was just with one finger. Shinju, on the other hand, was able to accommodate two fingers after only a brief massage.
Their sensitivity was different, too.
The rear isn't naturally a place for pleasure; the psychological stimulation far outweighs the physical.
Juju had been trained by Kaede's system, so a little teasing from Rin sent her into spasms. Shinju was much more "normal." While she had a reaction, as a first-timer, she only felt a mild sensation rather than spraying like her sister.
After the check-up, Rin withdrew his finger.
"Based on your tolerance... let's go with this one."
Rin picked a plug that was exactly one size larger than the one he gave Juju. Once Shinju finished with it, he'd pass it on to her sister.
"MMMPH!!!" Shinju gripped the pillow and squeezed her eyes shut. However, the expected pain of being torn apart never came. She only felt a heavy, dull ache in her rear.
"There..." Rin patted her cheek gently. "This size should be perfect. We'll adapt slowly from small to large. Until you're used to it, you'll wear this chastity belt. Once it's locked, no one can take it off but me."
"Eh... is Big Brother worried I won't be obedient?" The girl sat up and puffed out her cheeks cutely.
"It's not about being obedient," Rin laughed. "If you don't wear the belt, what if the plug falls out while you're walking?"
Hiss...
The image of the "little tail" falling out in public made Shinju suck in a sharp breath of terror.
"I can control this tail remotely, and it vibrates. When you feel it vibrate, you have to clench your muscles to make it stop... It's to train your rear. You wouldn't want it to stay loose forever, would you?"
Shinju shook her head frantically.
After locking the belt, Rin gave her butt a playful slap. "It's almost dinner time. Get dressed and get used to the feeling, then I'll take you home."
"Um..." Shinju bit her lip and looked expectantly at Rin's lap. "Before I go... does Big Brother need me to help 'vent' anything?"
After Shinju released Rin using her chest and mouth, he finally dropped her off near her home. Shinju's physical endurance and adaptability were much higher than Juju's.
By the time she reached the front door, she had mostly adjusted to the feeling of the plug... though wearing a locked belt with a tail inside still made her feel incredibly guilty.
"I'm home..."
Hearing her voice, Juju poked her head out from the kitchen. She was wearing an apron over her school uniform; clearly, she was the cook today.
"Why are you so late? Dinner is ready. Mom and Dad are working late today. Wash your hands and come eat."
"...Mmh."
Shinju's shifty eyes didn't arouse Juju's suspicion because Shinju was always like that—tall but soft-spoken and gentle.
After washing her hands, a paranoid Shinju checked herself again in the bathroom. Once she was sure the belt and tail weren't visible through her skirt, she went to the kitchen to help set the table.
Once the food was served, the sisters pulled out their chairs. With high synchronization, they both used one hand on the table and one on the chair back to lower themselves slowly... Normally, the plug would protrude slightly. Sitting on a hard chair would force it deeper, so both were being extremely cautious.
Juju had two days of experience, but Shinju was a novice. Her facial expressions weren't as controlled. If Juju looked at her, she'd surely notice something was up.
But both sisters were too busy feeling guilty and staring at their plates to notice each other's awkwardness.
"Shinju, are you sure you don't want to cosplay with us? Rin Ito said he found a friend to do Mirai. Don't worry about your body; we'll all have fun together."
Juju asked while eating.
"I... I'll pass. I'll just take photos for you guys."
They had barely spoken two sentences when... BZZZZZZZT.
The sound of a vibration seemed to ring in both of their ears simultaneously. Rin, sensing through the sensors that they were eating and that no one else was around, had wickedly turned on both vibrators at the same time.
Both sisters immediately lowered their heads and tensed their bodies, trying to hide their reactions. But because they were both doing it, they failed to notice the other's state... or rather, neither had the mental capacity to pay attention to anything else.
They were worried about being discovered, but Rin wasn't worried at all.
Little tails! ON!