"All measured up... mmm, looking at these numbers, your figure is really impressive, Shinju."
While her older sister, Juju, was busy convincing herself to fall into depravity, Rin Ito had finished taking all the measurements needed for Shinju's costume.
However, after the measuring was done, Shinju didn't put her clothes back on.
She covered herself with her hands, staring shyly and intently at the "tent" Rin had pitched in his trousers.
"I... I'll help Big Brother vent it out."
Shinju shrank into herself, looking at Rin with a mix of extreme bashfulness and unmistakable expectation.
She was terrified that Rin might actually say no.
Suggesting this didn't mean Shinju had become a nymphomaniac; she simply craved Rin's validation.
Seeing him get an erection for her was a form of approval, but having him spray his "masculine charm" on her face would be the ultimate prize.
She wouldn't do this for anyone else, but Rin had spent so much time drawing 4-panel manga for her and chatting with her online to boost her confidence.
Combined with the first time she met him, where Marin and Moeha tricked her into venting him once...
Now that the baseline of her morality had been breached, the rest was easy.
"I'll leave it in your hands then."
Rin sat back on the sofa while Shinju knelt on the carpet between his legs.
She stared at the bulge, swallowed hard, and used her trembling hands to open his fly.
Shinju used to be completely ignorant, but now things were different.
Beyond the "lessons" from Marin and Moeha, she had secretly read all of Rin's adult manga back in her room.
She finally had some theoretical knowledge.
Following the examples of the heroines in his doujins, she first used her soft, bouncy breasts to envelope him, squeezing from both sides with her hands.
Finally, she leaned down, took several deep breaths, and let the tip of her tongue peek out.
The moment her tongue touched him, she flinched as if electrocuted, looking up at Rin with wide, watering eyes.
"You're doing great."
Rin reached out and gently ruffled Shinju's hair.
Emboldened by the praise, Shinju happily lowered her head again, opened her mouth, and took him in.
Rin didn't move much, simply stroking her hair as he enjoyed her service.
The room was filled with the rhythmic, wet sounds of her working on him.
Shinju was a total amateur.
Being green, she mostly just held him and used her tongue cautiously, but that clumsy innocence had a charm all its own.
BZZZZT... BZZZZT...
Rin pulled out his phone. It was a message from Marin.
Marin: [Are you still with Shinju-chan?]
Rin aimed the camera down and snapped a photo of Shinju's head between his legs.
Even without her face, Marin would recognize her immediately.
Marin: [How much longer? Juju-sama is about to contact you.]
Rin: [What for?]
Marin: [Hehe... you'll find out in a second~]
Moeha and Marin hadn't told Rin how they had successfully brainwashed Juju.
Marin's cuckold fetish had been born from that party at Kaguya's manor.
For Marin, having the man she loved train her idolized cosplayer was like the ultimate five-course meal!
The only thing Marin regretted was that while Juju agreed to let Rin "train" her rear, she absolutely refused to let Marin and Moeha watch.
Juju didn't want anyone else seeing her in such a humiliating state.
Just as Marin's message ended, a text from Juju arrived.
Juju: [Are you home yet? Are you free?]
Rin: [No, why?]
Juju: [G-Go find a hotel and get a room. I have something to discuss with you.]
Rin didn't send a location immediately. He checked the time and sent the hotel name, setting the meeting for two hours later.
Shinju definitely didn't want her sister knowing she was currently with him.
"Does Big Brother have business?" Shinju looked up, confused.
"Nothing important. I just have a meeting later, no rush."
Rin said there was no rush, but he could feel Shinju trying to take him deeper, even letting out a few muffled gags.
Setting his phone aside, Rin gripped the firm, pink nipples on Shinju's massive G-cup breasts.
Juju was flat with tiny nipples, but Shinju's were substantial.
Kneading, pulling, and toying with them was much more satisfying.
The stimulation from her chest made Shinju clamp her legs together tightly.
She looked up cautiously to see if Rin was watching her... If I'm quick, he won't notice, right?
With that thought, she slid one hand down toward her own crotch...
It was like a student in class; they think the teacher doesn't see their fidgeting, but the teacher just doesn't feel like calling them out.
Rin didn't make things difficult for her. Twenty minutes later, he arched his back slightly.
"Hiss... Shinju."
"Mmph!?"
Alerted, a flustered Shinju stopped.
Recalling a scene from his manga, she tilted her face up, closed her eyes, and cupped her hands under her chin.
Seeing the familiar pose, Rin smiled and stood up.
A moment later, Shinju felt a wave of heat hit her cheeks.
The familiar male musk filled her mouth and nose, and a thick layer coated her eyelashes.
So much... so much proof of his charm.
Big Brother released so much...
Shinju kept her mouth open, using her tongue to swirl the fluids around just like in the doujins, savoring the taste before swallowing.
After clearing her mouth, she focused on what was dripping down her cheeks into her palms.
She used her fingers to scrape the excess into her mouth before opening her eyes.
After a few deep breaths, she stuck out her tongue to lick her palms and fingers perfectly clean, exactly as the heroines did.
"H-How was it?"
"Incredible. Especially that last bit where you licked your fingers clean—it was so cute."
"!!!!"
Thrilled by Rin's praise, Shinju balled her fists and gave a little hop of joy.
After a few more compliments, Rin sent Shinju to the shower.
This time, while some got in her hair, it wasn't the disaster Kei had experienced. She didn't have to worry about "egg-drop soup" hair.
Shinju stepped out in a bathrobe, her wet coral hair dripping.
The steam from the shower had left her cheeks flushed, giving her a mature allure that defied her age.
"I've sent your measurements to Orie... Don't worry, I told her to keep it a secret from your sister. Just find a time to go over there and discuss the details with her."
"Th-thank you... Big Brother."
"Calling me 'CEO' is too formal... just call me 'Brother' from now on."
Atchoo!
Back at the studio, Juju sneezed and felt a sudden chill on the back of her neck...
Why do I suddenly feel like I'm being cucked!?