After dropping Shinju off near her home, Rin arrived at the hotel right on schedule.
He didn't wait in the room; instead, he acted as if he had just arrived and met Juju at the cafe next door.
"Kept you waiting... so what's up? What was so important you couldn't say it at the studio?"
Rin sat across from Juju, playing completely ignorant.
Juju remained silent, just sipping her coffee.
But her face was turning scarlet at a visible rate.
Looking like a suspicious person about to commit a crime, she scanned the room before whispering, "L-Let's talk inside the hotel!"
Rin suppressed a laugh and stood up to take Juju's hand.
The moment he touched her, she flinched and swatted his hand away like she'd been burned.
Looking at the blushing Juju, Rin didn't look offended. He leaned in and whispered:
"If we don't act like a couple, people will think you're a student doing 'compensated dating.' The colder you act, the more people will notice us."
"..."
Terrified of being mistaken for a prostitute or a runaway, Juju finally took Rin's hand—she even hooked her arm through his.
If this were Shinju, Rin would be feeling incredible softness. With Juju, however... it was mostly bone.
"Is... Is this enough?"
Feeling Rin's body heat, Juju's heart began to race. By reflex, she even felt a slight moistening between her legs.
"With any other girl, sure. but with you, Juju..." Rin let out a wicked smirk. "I'll look like a pervert. Let's just hold hands; you'll probably be mistaken for my sister or my daughter."
Is he saying I'm so small I look like a child!? If it were Shinju, they'd think we were a couple!?
Juju's face exploded in red as she threw his arm off.
"Pervert! Who wants to be your sister or daughter!"
Rin smiled and took her hand again. This time, Juju didn't fight back.
Sister or daughter is fine... better than being seen as a call girl.
Then... Rin skipped the lobby entirely and took her to the room through the underground garage!
Hard. Juju's fists were getting hard.
Inside the room, Juju slammed the door shut and balled her fists, wanting to punch Rin.
Realizing it wouldn't hurt him, she just stomped on his foot instead.
But...
It didn't hurt!
Rin sat casually on the sofa where, not long ago, her sister had milked him for several "proofs of charm."
"So... why the secret hotel meeting?"
Rin watched her with a grin. He knew about the plan from Marin, but he wanted to hear Juju say it herself.
"I..."
The words died in her throat. Deep down, she was expectant.
She wanted to be trained. She wanted to feel that sensation again—the one that reached her absolute deepest core.
But being a proud tsundere, Juju couldn't just say that.
"It's... about Shinju."
She sat on a single armchair across from Rin and grabbed the TV remote, mindlessly flipping channels.
She began to repeat the "logic" Marin had fed her.
"Your manga helped Shinju with her body issues. But there are other problems... caused by me. Only I can solve them."
"And how do you plan to solve them?"
Rin blinked, acting like a curious child.
"I need to... do something shameful in front of her. To make her realize I'm not a perfect sister. And... it can't be something minor..."
Rin pretended not to notice her shoulders shaking with embarrassment.
"So what's the plan? Don't worry, for Shinju's sake, I'll do anything!"
"Y-You... Marin told you, didn't she?"
Looking at Rin's "righteous" expression, Juju immediately knew she'd been sold out. But...
"Nope. Marin didn't say a word. If you want my help, just tell me what to do. I'm not a mind reader. How am I supposed to help if you won't say it? Speak up. Stand in front of me and say it loud!"
"..."
Juju realized she was being toyed with.
Pervert... he just wants to hear me say it.
But... it was for Shinju. As a sister, what was a little shame compared to her sister's happiness?
After ten seconds of inner conflict, she gave herself the excuse she needed. She stood up and marched in front of Rin.
Juju: "Tra..."
Rin: "Tra? Tra-what?"
Juju: "Train..."
Rin: "What kind of training?"
Juju: "TRAINING!!!"
Rin: "Training for what?"
Juju: "TRAIN MY ASS! Because I'm a virgin, you have to train my ass! Train it until I can shamelessly use a tentacle plug to get off in front of Shinju!!!!"
A desperate Juju screamed the words with her eyes squeezed shut. Rin nodded in satisfaction.
"There we go. How am I supposed to help if you don't communicate?"
"Pervert..." Juju muttered.
Rin cleared his throat and stood up, looking at her with mock seriousness.
"I understand your vision now. Using this method to show Shinju your 'perverted side' to break your 'perfect image' is a solid plan. Don't worry; I have experience in these matters."
He paused and patted her shoulder.
"First, the rear is for elimination, not for... other things. Expanding it recklessly carries a risk of tearing. I assume you don't want to experience that, so your body must adapt slowly, starting from small to large."
"That's exactly why I asked an 'experienced pervert' like you to do it!"
Juju was being a hypocrite. If she really wanted to learn, the internet was full of tutorials, but she'd never admit she wanted him to be the one.
"No problem. From now on, I officially take ownership of your rear. No matter how I use it..."
"F-Fine... okay."
Ownership!? What the hell is he talking about!? Juju's lip twitched, but she nodded.
She didn't really know what she was getting into. In Rin's manga, there were butt scenes, but those were usually "instant entry." There was never a "training" process shown.
"Excellent spirit!" Rin nodded sternly. "I will do my best to train you into an ass-loving pervert!"