Bilibili! Cheers!
The image of a flat-chested, brown-haired girl with electrical powers flashed through Rin's mind.
But the "Bilibili" in Shinju's hand was far more potent than a simple lighter spark. The toy's voltage was actually quite low—on a finger or toe, it would be a mild tingle. Not even painful.
However... the place Sajuna was being shocked wasn't a finger or a toe.
"Eh!?"
By the time Shinju realized, it was too late. She had instinctively pressed the switch as Rin directed.
The petite Sajuna's entire muscular system went into a state of total lock-down from the current. Her mouth opened to its physical limit, but no sound escaped her throat. Her fingertips dug into the cushions until her knuckles turned white.
A long moment passed before Sajuna came to, her small frame shaking uncontrollably.
"Don't... don't look at me!!!! Uu..."
Before her plea even finished, a series of warm floods drenched Shinju. Then came the sound of faint sobbing... not from the shock, but from the shame of leaking in front of Shinju.
In front of her younger sister, it was one thing to be spanked to her limit, but... to be shocked by a toy until she pissed herself.
She might have even pissed on Shinju herself. From now on... she could never face her again.
Uu...
The more Sajuna thought about it, the more aggrieved she felt. Tears began to spill from her eyes.
"Uu... Sniffle..."
Sajuna sobbed and sniffled, but the "tears" weren't just coming from her eyes—they were leaking steadily from her vertical lips too.
"Eh? Big Brother... what do I do?" Shinju looked at the sobbing Sajuna in total panic, unsure if she should withdraw the toy or keep going.
In Shinju's eyes, Sajuna was the perfect sister. Even being spanked hadn't seemed like a huge deal; she just had a sensitive body.
But now... this was the first time Shinju had seen Sajuna cry. It was the first time she realized her sister wasn't the "Perfect Pillar" she imagined, but a real, vulnerable girl.
"It's fine. She's just feeling too good."
Rin gave Sajuna's rear a pat, ignoring her sobbing as he scooped her up by her knees. He pinned her small body with his arms so she couldn't struggle, and after a quick adjustment...
"GUH-EEEE!!!"
Being filled for the first time in a long time, Sajuna's sobs took on a wanton, melodic edge. The fluid that had stopped flowing began to leak again under the pressure of Rin's intrusion.
Rin grabbed the remote and turned on the 100-inch TV, mirroring his phone screen to it. The interior of Sajuna's body was now projected in crystal-clear definition.
And then...
"Hehe..."
Rin reached up and snatched the earplugs and blindfold off Sajuna. The sudden light made her squeeze her eyes shut. After a brief adjustment, she saw the panicked Shinju in front of her—and the massive TV behind her.
"!!!"
"!!!"
Sajuna's mind went blank. Rin had never told her he was going to have the final showdown today. Seeing how soaked Shinju was, Sajuna knew exactly where that "warm rain" had landed.
The sisters stared at each other in frozen silence. Neither could find a single word. Finally, it was Rin who broke the silence—not with words, but with a rhythmic movement.
The petite Sajuna was like a life-sized doll in Rin's embrace.
Under Shinju's gaze, Sajuna instinctively tried to cover her face, but Rin had anticipated the move, pinning her arms down so she had no choice but to display her most shameful expressions.
"Don't... don't look!!"
Dying of shame, Sajuna closed her eyes, trying to pretend Shinju didn't exist and that the camera inside her was a nightmare. But Rin wasn't about to let her hide.
"See, Shinju? Your sister is adorable inside and out."
Rin watched the screen while feeling her internal state, and then... Edge!
After a few rounds of "tease and stop," Sajuna finally reached her limit.
"Stop... stop toying with me."
"If you can't handle it, then beg," Rin said wickedly. "Tell me exactly what you want. How can I know what you need if you don't speak up?"
"D-Don't... don't stop," a humiliated Sajuna pleaded in a trembling voice.
"Don't stop? Stop what? Be specific. I don't know what 'don't stop' means."
"Uu..." Driven to the edge of shame and bullied by Rin, Sajuna's voice cracked into sobs again. She closed her eyes and surrendered her pride. "I want... I want you to keep bullying my ass!"
"I see... denied." Rin shot a glance at Shinju before pivoting. "I won't do it. But whether Shinju will or not... that's not up to me."
"..."
Sajuna finally understood what Rin wanted her to say.
"T... Turn on the switch."
"Shinju... turn on the switch."
"Eh?" Sajuna's words snapped Shinju out of her daze.
"Uu... Shinju, I... I'm a perverted sister. Please, I'm begging you... turn on the electric shock button from before!!!"
Sajuna discarded every scrap of dignity and authority she had built up since childhood. Shinju stared at her... she had never seen this side of her sister.
"Shinju..."
Hearing her name again, Shinju finally moved. She swallowed and slowly wrapped her hand around the toy clamped between Sajuna's legs.
"Sister..."
"Turn it on... GUH-EEEE!!!"
BZZZZT!
The moment Shinju hit the switch, Sajuna's body went rigid, the veins on her forehead pulsing. Her parted lips gasped like a fish out of water, and her pink eyes rolled back, revealing the whites.
The next second, Sajuna's body slumped like a kite with its string cut.
The physical shock was one thing; she was used to the "Bilibili" sensations by now. But being forced to expose such a pathetic, depraved side to her beloved sister was too much for her psyche. Her brain simply shut down to escape reality.
"S-Sister!?" Shinju let go immediately. "Did she pass out from the shock? What do I do? Should I call an ambulance?"
If Sajuna knew Shinju wanted to call a doctor, she would have forced herself to wake up just to stop the embarrassment.
"She's fine. That voltage is lower than what she usually plays with. She just fainted because she couldn't handle the shame of being seen like that. Let her rest."
Rin looked at Shinju with a playful grin.
"Do you want to try it?"
Shinju shook her head violently.
She couldn't even imagine the terrifying sensation of being shocked in her deepest core.
Rin chuckled and lifted Sajuna. With a wet 'Pop!', he withdrew from her body and set her aside.
"Shinju, you've been watching for so long. Aren't you hungry?"
Faced with Rin's teasing look, Shinju bit her lip and guiltily looked away. Though she didn't speak, her answer was written all over her face.
Rin didn't say a word either. He simply patted his thigh.
Blushing furiously, Shinju walked to Rin, turned around, and slowly lowered herself. Once she confirmed the alignment, she sat down and let out a deep, satisfied groan.
"Uu..."
Rin embraced Shinju from behind, his hands kneading and squeezing her massive chest.
"What did you think of Sajuna today?"
"She was... very cute!" Though bashful, Shinju gave an honest answer. "Today, Sister was the cutest she's ever been~"
"Right? A sister who works this hard for her sibling is the best." Rin smiled. "In truth, Sajuna agreed to be trained specifically for your sake... or at least, that was a major part of it."
"Sister..." Shinju looked at the sleeping Sajuna. Her sister's body was small, but in her heart, she was a titan.
"She never says it, but she envies you... she envies your incredible figure. She wants to cosplay more than just magical girls. As the older sister, she has so many insecurities, but she always hides them behind a tough mask for you."
"She wanted you to know that she isn't perfect. She has her own struggles and things she can't do."
"Sister..." Shinju stroked the hair on Sajuna's forehead. "No matter what, she will always be the best sister in the world to me!"
"That's the spirit." Rin ruffled Shinju's hair. "Since Sajuna has shown you her most shameful side, don't you think you should show her yours too?"
"Eh?" Shinju froze. "WHAAAAAAT!?!?!?"