Pet Sister (2)
Jeong Seo-yoon's innocent question left Siwoo laughing hollowly as he pinched the bridge of his nose.
"Ah, right."
Thinking about it, he'd only tinkered with her dependency settings. He hadn't touched her sexual knowledge or libido levels, so to her, masturbation was just a word—nothing more, nothing less.
Seo-yoon's face fell noticeably as Siwoo's expression shifted subtly. The fact that she couldn't carry out her master's command tormented her. The thought that she was a failure as a pet sister flashed through her mind.
She knew what masturbation was, sure. But all the Eden chip had taught her was a brief note: Back in the days before the Eden chip, humans relieved their sexual urges that way. No details on the hows or mechanics.
Her eyes welled up as she tugged at Siwoo's sleeve pleadingly.
"Sorry, Siwoo. I just don't know it well... Teach me, and I'll do it right away. Don't throw me away, okay?"
"No one's throwing you away. Got it. Just wait a sec."
Siwoo pulled out his terminal from his pocket. He fired up the app and opened Seo-yoon's detailed settings. He unlocked the locked sexual knowledge data, transmitting it straight to her brain, and cranked her near-zero libido up to 50%.
> Data Synchronization Complete.
Seo-yoon's eyes glazed over in an instant, a faint blush spreading across her pale skin. She shivered, looking down at her body. No questions about how this was possible or why she suddenly felt hot. Only the instinct to perfectly fulfill her master's command dominated her.
"Ah... So that's what it is. Got it."
Seo-yoon crawled to the center of the bed and spread her legs wide. When Siwoo's gaze hit her pussy, she didn't blush—instead, she lifted her hips to show it off better.
Her hands went straight to her breasts first. She grabbed them roughly, flesh spilling between her fingers.
"Hngh... Like this, right?"
Seo-yoon rolled her stiff pink nipples between thumb and forefinger. The intense stimulation made her hips buck. Her other hand slid down, probing her pussy entrance. The slick wetness at her fingertips drew a low moan from her.
"Ah, haa... It's already so wet. Feels even better with you watching, Siwoo. My spine's tingling... ♥"
She placed her middle finger on her clit and started rubbing small circles. A sharp jolt of pleasure stabbed her brain; she bit her lip. Her other hand kept twisting her nipple as moans spilled out.
"Haa, ah! Here, this spot feels weird. Siwoo, I think something's wrong with me..."
Seo-yoon shoved the finger rubbing her clit straight inside. Her hot, tight walls clamped down. She pistoned it roughly in and out. Squelch—schlick—squish— lewd, explicit sounds filled the room.
"Haa... Ah, hngh! Can you see good, Siwoo? I put my finger in my hole. Look, this deep..."
Seo-yoon stuck out her tongue teasingly, licking her lips to tempt him. She added a second finger, stabbing deeper. Her other hand squeezed her breast, yanking her nipple hard. Every nerve felt rewired for pleasure—her body twitched at the slightest motion. Clear juices gushed from her pussy, soaking the sheets. She thrashed her fingers wildly, her back arching like a bow. The harder she pressed her clit, the more her moans turned to screams.
"Hng, hnghh♥ I'm cumming♥ Watch me, Siwoo♥ Watch your sister cum♥"
Suddenly, Seo-yoon's body went rigid. Her eyes rolled back, drool spilling from her mouth. A fountain of clear fluid squirted from her pussy.
Seo-yoon's hips shuddered violently, unleashing a flood that soaked the bed in seconds.
"Ah, haa♥ Haa... ♥"
Seo-yoon collapsed limp onto the bed, panting raggedly. But she lifted her hazy eyes to Siwoo. She crawled over, nuzzling her head between his legs. Her wet lips licked his knee as she acted cute.
"Siwoo... Did you watch good? I came so much just now. Praise me... please?"
Like a puppy wagging its tail, she rubbed her cheek against his thigh, full of aegyo.
Siwoo slowly stroked her sweat-and-juice-slicked hair.
"Good girl, sis."
That single phrase lit up her face like she'd won the world. She purred, rubbing her face into his palm.
"Yeah, if you like it, I can do it again. A hundred times, a thousand. Aren't I a good girl?"
Her pride as the eldest sister, her shame as a woman—all long gone.
"You'll do whatever I say from now on, right?"
"Yeah. Even in front of Mom or Da-yeon, if you tell me to masturbate, I will!"
Seo-yoon was a perfectly trained pet sister, ready to sell her soul for her little brother's command and praise.
* The next night.
Seo-yoon hugged her pillow to her chest and opened Siwoo's door without knocking—it was routine now. Formality was just a nuisance for a pet sister entering her master's room.
"Siwoo, I'm here..."
Her voice brimmed with anticipation as she scanned the room. But it was empty. Bed made, chair neatly pushed in.
"Maybe he went to the bathroom."
Mumbling, she approached his bed. Her hand on the sheet felt lingering warmth—proof someone had been lying there moments ago.
She grinned and slipped into his spot. Burying her nose in his pillow, she inhaled deeply. The rush of her master's scent made her shiver.
She zoned out, recalling yesterday.
"That masturbation yesterday felt so good..."
Seo-yoon rubbed her thighs together, reliving the pleasure. The memory of freely groping herself on her brother's orders was burned deep into her brain. She'd snuck a quick masturbation when he wasn't looking, but it wasn't even close—frustrating, almost unpleasant compared to when he commanded her.
It confirmed what she already knew: Her happiness, her pleasure—everything depended on Siwoo.
She closed her eyes, hoping he'd give her that command again today. Or something even more intense.
But ten minutes passed, then twenty. No Siwoo.
Seo-yoon pouted and sat up.
"Nng... Where are you, Siwoo..."
She wandered out, searching. Not in the living room. Kitchen empty—no water break. The yard outside held only chilly night air. She knocked on the bathroom door—no response.
"Siwoo... Master..."
Forgetting not to call him master, she stomped her feet.
That's when it came—a faint sound from the end of the hall, Mom Kim Chae-eun's room.
"Ah, haa... Yeah...!"
Seo-yoon froze. The voice was familiar. Eerily like her own gasps from yesterday's commanded masturbation on the bed.
Drawn like a moth, she tiptoed to Mom's door. It wasn't fully closed—a finger-width gap leaked dim mood lighting.
Seo-yoon held her breath and peeked through.
"Ah, aaah! Siwoo, ah... ♥"
Inside, Mom Chae-eun was face-down on the bed, panting hard. Pinning her pale back was none other than Siwoo. Both stark naked, locked in sticky, sweaty sex.
Chae-eun's body rocked wildly with Siwoo's rough thrusts.
"Siwoo...?"
Seo-yoon's lips quivered faintly.
"Son♥ Hngh... ♥ Your cock's so tight♥"
"Mom. Squeeze that pussy properly."
"Got it... Hrrgh... ♥ Like this?"
Mom clung to Siwoo, calling his name. Just like Seo-yoon yesterday—but far more blatant, animalistic, writhing under her son.
A strange emotion washed over Seo-yoon. Not jealousy or betrayal—pets weren't allowed such complex feelings. Just a vague sense of loss: Her master was with someone else. Someone she was close to, like Mom.
But even that faded fast. The explicit sight through the crack heated her body. Her thighs slickened instantly; she swallowed hard.
She couldn't tear her eyes away from the family scene. Now on the floor, face pressed to the gap. Mom's swaying breasts with each thrust, the glimpse of pussy and cock joined, her face smeared with spit and tears. Mom's moans were even lewder, more obscene than Seo-yoon's yesterday.
To muffle herself, Seo-yoon bit her hand, the other shoving roughly between her legs.
"Ah, haa... Mom's so lucky. Getting it like that from Siwoo."
Was Mom his pet mom too? Since when? He didn't prefer her over me, right?
Complicated thoughts vanished as her finger mashed her clit. Her eyes rolled back. Just seeing Siwoo sent electric pleasure up her spine to her brain. She rubbed her soaked pussy furiously, staring holes into his broad back.
What if I were in her place?
Seo-yoon's hazy eyes imagined herself there instead. Siwoo's hand gripping her hair, kneading her ass, stuffing her breast in his mouth. Gasping, smiling at him, acting cute, shaking her hips.
She plunged fingers deep inside, panting low. The fantasy alone sent chills of ecstasy through her. Twisting in climax, she came hard.
Riding the afterglow, panting, Seo-yoon's eyes flew wide.
Siwoo was getting up—heading straight for the door.