Chapter 8. Little Sister's True Feelings
"Oppa~? What's this~?"
"…."
She already knew damn well what it was, so I didn't bother answering.
"Oppa, I said what's this? Something hard is poking my stomach? Hehe."
A-young wiggled her hips gently, rubbing her soft belly fat against my glans. Even through my panties, the stimulation was intense. My Ju-ji—the one getting tormented—twitched uncontrollably.
"No way, is it hard? Did you get a boner from smacking your little sister's ass? Huh?"
A-young's voice dripped with mischief. She was dying to tease me. But this time, I had a legit grievance. She was the one who'd caused it.
"This is your fault for moaning like that."
"When did I? I've never moaned!"
"…."
I wanted to request a video review, but there was no CCTV in the room, obviously.
"Oppa really is a perv, huh? Getting hard just from groping your little sister's ass. No wonder your nickname's Ju-ji-hoon."
"…Cut it out."
"Nope~? What're you gonna do about it? Perverted oppa who gets rock-hard for his little sister."
"This!"
I channeled mana into my right hand. I slammed it down hard on her ass, detonating the mana from my palm.
Smack!!
"Hyah?!"
A-young's body jolted like she'd been hit with a taser, trembling all over.
"You dare tease your oppa like this?"
Smack!! Smack!! Smack!!
I alternated between her right cheek and left, two smacks each.
"Hngh! Hyaa~n..! Hnyaang~!!"
Every time my hand connected, A-young bounced. She clutched her pink pillow tight, kicking her legs back and forth.
"H-how do you know how to do th-this..? Didn't you lose your memories..?"
Her voice quivered as she asked.
"I've got my ways."
I'd referenced the diary entries.
[Tried disciplining my little sister, but the spec gap made it impossible.]
[Tried spanking her soles, but she just mocked me: 'Lame oppa~ Doesn't hurt at all~. Nyah nyah~']
[Developed a discipline method using Mana Correction.]
[It gives a sharp sting without leaving external marks—perfect.]
Thanks, past me. Your notes let me properly school my little sister.
Smack!! Smack!! Smack!!
I kept spanking until my anger subsided.
"Hnyaah~!! You can't just do this out of nowhere, oppa~!! Hyaaang~!!"
A-young wailed and flailed, but I didn't flinch. No getting swept up in emotions. Cocky little sisters need discipline. Gotta keep the hierarchy straight. Damn right.
"Hoo.. hoo.."
Once it was over, A-young slumped on the bed, utterly spent. Tears welled in her eyes—it must've hurt like hell. I'd lost it in the moment and gone overboard, but now that it was done, I felt a twinge of guilt.
"Did it hurt a lot?"
I stroked her head gently as I asked.
"It felt so gooood..♡"
"…?"
Good? Wasn't it supposed to hurt? Was it that extreme pain turns to pleasure thing? Hell if I know. It hurt, for sure.
"Feel more awake now, right? So no more messing around. I'm your oppa."
"Yessir~♡ I'll be good from now on~♡"
"…?"
Why the sudden formal speech? Her reactions seemed off now that I looked closer. Her eyes curved seductively, her mouth slack in a dopey grin. Looked like she'd gone or something. This felt dangerously off...
Time to boot her out.
"We're done here. Get out."
"Huh..? Why..?"
Her voice oozed aegyo. Definitely not normal.
"You triggered my ejaculation quest. Gonna call Ravisse and have her drain one."
"Th-that…."
A-young nibbled her lip. She had something to say.
"What? Spit it out."
"…Nothing."
She slid off the bed and headed for the door, her steps were wobbly like her legs had given out.
Click.
The door shut. Finally rid of my little sister.
"Haa.."
I sighed deeply and flopped onto the bed. Somehow muddled through that. Good call reading the diary ahead. With benefits like this, better finish the rest quick.
I resolved to do just that and propped myself up on the bed. That's when my palm felt something damp.
"…Huh?"
I squinted. Near where A-young had been lying face-down, there was a wet spot.
Where the hell did this come from? I rubbed it with my fingertip and sniffed. Tart-sweet orange scent. Same as the fragrance wafting from her when she got close.
This.. no way..?
The worst possibility hit me. The diary entries I'd checked were from years ago. I rushed to the computer and opened the diary app. Searched "corporal punishment" sorted by recent.
[Used to be able to discipline her with Mana Correction.]
[But as time passed, A-young's durability improved—she stopped feeling pain altogether.]
[Asked her, and she said it's more pleasure than pain now.]
[These days she begs for it herself, so I only do it as a reward for good behavior occasionally.]
What the hell do I do..? Feels like I've stumbled into the incest route..?
「Joo A-young's POV」
'My legs feel like jelly..'
Joo A-young braced herself against the wall, taking shaky steps forward. It'd been ages since her last "reward," and all the pent-up tension had exploded at once.
'Almost pissed myself..'
A little had leaked out, actually. But it wasn't a full-on squirt, so relief.
'Can't let Mom find out..'
If they crossed paths and she spotted the glowing red handprints on her ass? No excuse would fly. A closer look would reveal her soaked panties too. She hurried to her room as fast as she could manage.
'He really does see me as a woman.. not just a lie.'
A-young had half-given up before. Zero chance of anything with oppa, she'd thought. And she'd even confessed outright.
"I like you, oppa. Not just as family—as a woman too."
She'd stared straight into his eyes, confessing head-on.
Oppa gave a wry smile.
"You know I have to turn you down, right, A-young?"
"Yeah. But I had to say it. Felt like I'd explode otherwise."
Her voice cracked with tears, despite vowing not to cry. Rejection stung.
"Good job. Better to try than suffocate."
He smiled softly, patting her head.
"Will you go out with me?"
"Can't do that, but I promise nothing changes between us."
That alone was a mercy. If this fractured their bond, she wouldn't want to live. She knew it was a small win, but tears flowed endlessly anyway.
Joo Ji-hoon just held his sobbing sister in silence.
'That's the past now. Things could be different today….'
Oppa had said he saw her—his family—as a woman. Could've been a white lie to dodge trouble, but no. She'd tested him with deliberate teasing to see if he'd get hard, and jackpot. Way easier than expected.
'It's possible for real now.'
Family and lovers. No word for it. The taboo was so absolute, no label existed.
'But nothing's impossible. I'm already a murderer anyway.'
Social reputation? Way past caring. Laws and stares weren't her moral compass.
'Oppa.. just look at me, that's enough..'
If oppa said okay, it was. If not, it wasn't. To her, he was god.
Click.
Back in her room, A-young dove straight into masturbation. Ever since way back, "spanking" days ended with a solo session.
"Oppa.. oppa.."
Her needy voice bordered on moans. One hand kneaded her breast, pinching the nipple. The other gently rubbed her protruding clit.
Eyes shut, she relived today's sensations. Oppa’s thing grinding against her lower belly. Impressively thick even through panties.
'If something that big goes inside me..'
Just imagining made her core throb, body heating up.
'Feels like it'd push my guts aside.. Might hurt a bit..'
One thrust, and her insides would reshape overnight to fit him perfectly. That's what she craved—total taming by oppa.
'Rough at first, but it'll click eventually. We're blood siblings—perfect compatibility.'
She truly believed it.
"Hngh..!"
She bit her lower lip, twisting her clit. Imagining his embrace, she climaxed.
She hadn't fingered inside—not even a fingertip on her clit, just light taps. Her pussy itched for more, walls begging to be scraped, but she held back. Satisfied with external only.
'Saving the first time for oppa..'
She wanted to offer her virgin pussy pristine.
'Should've done it today..'
Right before leaving his room, she'd almost said it.
I'll take responsibility since I made it hard.
But chickened out—afraid he'd bolt.
'Take it slow. We've got forever. We're family—no drifting apart.'
With her head cleared, she pondered her next "prank."