Phew...
Looking at the de-masked Shinju, Rin let out a long sigh.
He hurriedly erased the image of her "beautiful man" look from his brain.
Being freed from the suffocating binder made Shinju let out a massive sigh of relief too.
A binder that could hide G-cups was anything but comfortable, but she endured it for her passion.
Shinju sat on the bed, endlessly scrolling through the photos they had just taken.
She couldn't hide the smile on her face. After a while, she wiggled over to Rin, who was packing up the gear.
"Does Big Brother like the 'me' from before, or the 'me' now? You said boys use their rears... my rear is ready for you now."
Rin gave her a gentle chop to the head.
"Ehehe~~" Shinju stuck her tongue out playfully, but her bright eyes were full of longing.
"Don't be in a rush." Under her confused look, Rin pulled out his phone and sent a message.
"It'll be about thirty minutes."
Rin didn't explain, and Shinju didn't ask. She just logged into her "Juju" social media account to interact with fans.
From makeup to photography to social media management, Shinju handled everything for her sister.
Rin took the uniforms and binders, packed them away in the bedroom, and then brought out a blindfold and a leg-spreader bar.
Initially, Shinju thought they were for her, but Rin just gave her a mysterious smile.
About half an hour later, the doorbell rang. Shinju looked at Rin.
Rin pointed toward the bedroom. Shinju got the hint and ran inside, leaving the door cracked just a tiny bit.
Then she saw the visitor... Big Sister!?
Shinju instinctively clamped her hand over her mouth.
She knew her sister was acquainted with Rin, but she never imagined this kind of relationship!
But thinking about it, it made sense. Her sister was cute; it was only natural for Big Brother to like her.
"I thought you said you were busy today?"
Today Juju was wearing a grey puff-sleeve dress and black ankle boots.
She stood with her arms crossed, frowning at Rin in displeasure.
"I was busy." Rin smiled with a flirtatious air.
"But when I saw how pitiful you were, intentionally failing your 'clench' tests just to get shocked to a climax, I had to make time."
"Who... who gets shocked on purpose!?" A blushing Juju flared up in tsundere mode.
"I... I told you! Those tails... they're stretching me out! I can't hold them in, that's why I get shocked!"
If it were a standard toy, Rin might have believed her. But these were system-redeemed items.
"Stretching you out, huh? Then I'd better perform a thorough inspection."
Rin brought out the leg spreader he had prepared—it was a simple rod with two cuffs.
After cuffing Juju's slender ankles, Rin placed the blindfold over her eyes.
"W-Why are we using these!?"
Usually, she just had to stick her ass up. Why the extra gear today?
"This is a test. To be accurate, we have to remove all distractions—like your sight."
Rin made up a reason on the spot. They both knew the truth: she was here to be used, and he was here to use her.
"Take my dress off first! Don't get it dirty!"
"Right, right." As he spoke, Rin shot a look at Shinju, who was peeking through the door, and beckoned her over.
He signaled for silence and pointed at Juju's dress.
Understanding the plan, Shinju tiptoed over to her sister and expertly unzipped and removed the dress.
"!!!!!"
When Shinju saw her sister was wearing the exact same model of chastity belt she was, she was stunned.
And... there was a small white electrode pad connected to a wire stuck on Juju's stomach.
Hiss...
That position... isn't that over her...
Is Big Sister really playing this hard?
While Shinju was in a daze, the blindfolded Juju expertly assumed the "OR2" position on the sofa.
As Rin unlatched the chastity belt, Juju's succulent, petite buttocks were laid bare to both of them.
Shinju noticed that besides a plug one size smaller than her own, there was an oval vibrating toy as well.
Shinju cautiously reached for the tail plug.
She had helped her sister dress and undress a thousand times, but she had never removed her "tail."
She gripped the pull-ring and slowly...
"GUH-EEEEEE!!!!!"
Juju's entire body suddenly went rigid, spasming like a high-pressure pump.
She began to spray a mixture of juices and urine, terrifying Shinju into letting go.
After a long moment of tension, Juju finally went limp, her breathing heavy and ragged.
Shinju held her breath... So cute. Big Sister is so cute like this!
"Wh... why did you shock me again!?"
"Sorry, sorry. I forgot to turn off the anti-removal sensor. My bad."
Rin laughed and turned off the alarm on his phone, then signaled Shinju to remove all the toys from Juju's body.
After dealing with the MyGO and Mujica girls, Shinju's "inferiority complex" was no longer a concern.
Rin's plan was to let Juju lose all dignity in front of Shinju.
Once Shinju saw that her "Perfect Big Sister" was just as flawed and depraved as anyone else, her psychological complex would vanish.
To keep Juju's reactions authentic, Rin hadn't told her about the plan.
Only a raw, unfiltered reaction would show Shinju the truth.
Rin took a hair tie and pulled Shinju's hair back, then typed a message on his phone for her to see.
[You can toy with her however you want. She won't know it's you.]
Gulp...
Shinju swallowed, her eyes fixed on the dripping Juju.
Because Juju was on all fours, a mixture of urine and fluids was sliding down her stomach, passing over her flat chest, and dripping onto her face.
Shinju cautiously extended a finger and poked Juju's rear.
Poke. Poke. Poke.
"Why are you just poking me? Did you awaken some weird new fetish!?" Juju wiggled her hips.
Being poked in a non-sensitive spot while she was desperate for a real sensation was agonizing.
After a week in the chastity belt, she had been counting down the minutes until the weekend.
"Do you want it that badly? If you want it, you have to say it. How am I supposed to know what you want if you don't speak up?" Rin said, holding back a laugh.
"You have to be very specific about what you want done to that hole of yours."
"You... pervert."
Hmph... this pervert just wants me to say lewd things!
"You... you said you didn't mind the mess, right? Then... then use your tongue to lick me clean."
Juju had no idea Shinju was there. She thought Rin was just being his usual wicked self, wanting to hear her debase herself.
If she knew her sister was watching, she would have killed Rin and then herself.
"Is that so?" Rin winked at Shinju.
Shinju swallowed hard... Her sister had always been the embodiment of discipline and seriousness.
She never imagined her sister would not only wear a chastity belt, but beg for such depraved things and ask for "licking."
Sister is so cute when she's like this.
"Hmph... afraid of a little mess? That's what you get for shocking me!"
Slurp~
"EEEEK!!! Y-You're actually licking!?"
"You were the one who asked for it."
Rin suppressed his laughter and signaled Shinju to continue. Juju tried to say more, but she no longer had the capacity.
Her body became a human fountain, shaking and spraying uncontrollably.
It wasn't that Shinju had some god-tier technique; it was simply that Juju's body was far too sensitive now.
After over two weeks of continuous training, Rin could see on the system that her sensitivity had nearly doubled.
Combined with the Pavlovian response to the electric shocks, even a touch to a "safe" area felt like her absolute deepest core was being stimulated.
Shinju was no longer the innocent girl she used to be. Seeing Juju in such bliss made her lick with even more fervor.
Watching the sisters was a treat for the eyes, but Rin wasn't just going to stand there.
The younger sister was toying with the older sister's petite rear; it was only fair that he toyed with the younger sister's massive one.
Shinju was about the same height as Rin. As she bent over to reach Juju, her position was perfect.
After so much training, it was time for a taste.
"!!!!"
Shinju's entire body went rigid. If her mouth weren't occupied by Juju's rear, she would have screamed.
To keep her secret from Juju, she had no choice but to bury her face even deeper into her sister's heat~