"Cooperate? How?"
"Just a little bit of cooperation."
Marin pinched her thumb and index finger together. Juju looked at her with suspicion... whenever Marin made that "playing dumb" face, it usually meant trouble!
"So? Want to give it a try?"
"Try what!? Marin, explain yourself first!" Juju instinctively took a step back.
Dangerous.
Marin's current expression was way too dangerous!
"I have a friend..."
Marin pursed her lips, trying to look serious, but the mirth in her eyes was impossible to hide. She barely started before Juju cut her off.
"Is this 'friend' actually just you?"
"It really is a friend! Juju-sama, listen to me." Marin organized her thoughts. "My friend is just like Shinju—insecure and friendless at school. But just this past Saturday, in a single day, she transformed and became so much more cheerful."
Juju's interest was piqued...
"In a single day?"
"Exactly! One day!" Marin held up a finger triumphantly. Then her tone shifted. "Her mental block was different from Shinju's, so it's not a perfect comparison. But the point is, once the block was broken, her confidence returned."
"Mental block...?" Juju furrowed her brow. "Shinju's block is her height and... me?"
"Correct~ As expected of Juju-sama~" Moeha chimed in from the side. "Big Brother already helped her with the height issue through his manga. The rest has to be solved by you, Sister Juju~"
"Hmm... and how do I solve it?" Juju pondered. The logic made sense, but... something felt fishy.
"Hehe..." Seeing Juju wavering, Moeha jumped in. "In Shinju's eyes, Juju-sama has always been the 'Perfect Big Sister.' That is one of the roots of her insecurity."
Juju nodded, looking slightly helpless.
She didn't want to be the "perfect sister," but when Shinju was bullied or excluded for being taller than her peers, how could she just stand by?
A sister's job is to protect.
She stood up for Shinju and protected her, and over time, Juju became an invincible, perfect figure in Shinju's eyes. Even when things were difficult, Juju forced herself to succeed for her sister's sake.
"So, you just need to let Shinju see your 'imperfect' side." Marin blinked. "But it can't look staged. She has to 'accidentally' see you looking pathetic—looking like a normal, weak girl."
"Normal? Pathetic?" Juju frowned deeply. She had to act normal yet losing face, and let Shinju "happen" to see it.
After a moment, Juju suggested, "Walking to school with toast in my mouth and tripping? Or buttoning my shirt wrong?"
"Those tropes are outdated even in manga." Marin waved her off. "And they're too mild. It would take forever to build Shinju's confidence that way. Besides, you can't trip every day; she'd see through it. You need to do something shameful that Shinju has never seen before."
Something shameful she's never seen...
Juju hesitated. She had a guess as to where Marin was going.
"Like... pretending I didn't lock the door while I'm masturbating?" Juju asked tentatively.
Marin shook her head, her smile widening.
"Masturbation is normal. Shinju probably does it too. You need to do something more humiliating."
"Like what?"
"Like Juju-sama's 'Zako' (sexually pathetic) body."
"I... I am NOT a 'Zako'!" Juju's face exploded in red. Memories of the convention parking lot and Kaguya's manor flooded back.
That day, just by watching Marin lick Rin's fingers, she had shared the sensation and squirted so hard she passed out... While that ultimate pleasure was etched into her memory, she didn't want to bring up that shameful moment.
"Moeha told me Juju-sama is still a virgin, right?" Moeha looked Juju up and down with a smile. "If you're a virgin, we can't do anything too extreme or humiliating."
"...Just say it plainly." Juju sighed. "What do you want me to do? If it restores Shinju's confidence, I don't care how shameful it is."
She was tired. Just end her already.
Moeha led the two of them to the villa's basement. The moment they entered, Marin held her breath.
Not because of any lingering smell, but because of the array of training tools.
"Th-this place is perfect for a Shizuku-tan cosplay! So many bondage items! Whoa... a girl could fit perfectly in that cage. Decision made! This weekend I'm cosplaying Shizuku-tan here!"
Unlike the excited Marin, Juju's lip twitched as she surveyed the gear. She didn't know what to say.
Before she could react, Moeha pulled a soft, squishy object shaped like an octopus tentacle from a cabinet and held it out to Juju.
"...?"
"Use this~ But Juju-sama can only use it in her butt for now."
Gulp...
Looking at the "tentacle" in Moeha's hand, Juju swallowed hard.
"Shove that... in my butt?"
"Exactly!" Marin ran over with a wicked grin. "Since you're a virgin, Juju-sama, we need to 'develop' your rear first. If Shinju sees you with your ass in the air, stuffed with this thing, pathetic and reaching your limit over and over, her 'Perfect Big Sister' image will shatter and her confidence will soar!"
"Plus, after you're 'developed,' you can use plug-in tails for cosplays! You'll look so much cuter and more bashful with a tail plug!"
"NO NO NO NO NO!!!!"
Juju scrambled backward, shaking her head. Masturbating was one thing, but being seen by her sister using that thing to get off?
Absolutely not! Never!
Juju's refusal was expected. Marin was already prepared.
"What if he is the one who performs the development?"
"Him? No..." The words died in Juju's throat. If Rin Ito were the one...
She instinctively remembered the convention—the feeling of being stimulated directly at her deepest core, a sensation she could never reach alone no matter how she tried.
Just thinking of it made her womb itch and her heart skip a beat.
It's for Shinju. And Marin said it would make my cosplays cuter with a plug...
In less than ten seconds, Juju had convinced herself.
"F-f-fine... let's just try it."