Don't You Feel Sorry for Your Sister?

"Don't you feel sorry for your sister?"

"H-how… how do you… don't… stop…"

Her voice shook violently at the thought that her shameful secret had been found out. ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Color flooded her face in an instant, and her startled eyes darted toward the kitchen.

The sounds of Eunjeong washing dishes — water running, plates clinking — carried through with perfect clarity. Each one struck her heart like a hammer.

Taeseok's hands grew more blatant, roaming over her body without restraint.

"Were you thinking about me when you did it?"

"No. What the hell are you even talking about? I never did that."

The denial came even faster this time.

"Ajumma, your lies are way too obvious."

"You keep messing around like this and I… I'm going to get mad."

"Go ahead. I'd like to see you angry."

Taeseok seized her breast and kneaded it roughly.

"Haaang~ Seriously, what's wrong with you. Unnie… she'll be back any second…"

Eunsu barely managed the words in a trembling voice. It was neither permission nor refusal. And her body was already answering his hands. Her thighs quivered faintly; she could feel the inside of her hot pants growing hot and wet all over again.

Savoring her reaction, Taeseok whispered even lower.

"Clearing the table, peeling fruit, making coffee… fifteen minutes at most. We don't have time for you to hesitate like this."

He tipped her ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠chin up and looked straight into her eyes.

"What is that supposed to mean?"

"You want me to hold you."

His voice was sweet and dangerous all at once. Eunsu bit down hard on her lip.

No… not here… I can't…

She screamed it desperately inside her head, but her body was already leaning into his arms.

In that instant, Taeseok crushed his mouth against hers.

"Mmph…!"

Eunsu flinched, shrinking back for a heartbeat — then his hot tongue pushed into her mouth, and every scrap of resistance melted away. One of his hands yanked her waist hard against him; the other slid into her hot pants and rubbed her sex with his fingers.

"Haahk…!"

Her hips jerked hard.

No. I swore… I swore I wouldn't do this again.

After catching her sister and Taeseok having sex in the kitchen, she had touched herself and, in her own way, tried to get her thoughts in order. No matter how good sex with Taeseok had been, now that she had seen with her own eyes that he was her sister's man, she had to cut him off. What happened between them had to stay a single mistake — nothing more.

The moment his body touched hers, every one of those resolutions blurred into nothing. His hands, his heat, and that unidentifiable hot energy seeping into her were dissolving her reason.

Have I always been this weak to lust? I can't even cut off one kid like this? God, I'm pathetic.

Even thinking it, she couldn't make herself let go of his neck.

Without breaking the kiss, Taeseok tipped her back onto the sofa as if laying her down, then shoved his pants down and freed his thick, rigid cock.

Crazy… is he seriously… going to do it right here?

She knew what was coming and still didn't resist. No — she couldn't.

Her pants were gone in a blink. And just as she expected, the head of his cock pressed against her sex. The instant his length touched her most private place, Eunsu felt that same irresistible rush of pleasure. The storm of sensation his cock had driven into her body before came flooding back.

Still, panting for breath, she wrung out the last of her reason and shoved at his chest.

"Taeseok… if you… do this to me… don't you feel sorry for your sister…?"

Her voice shook with desperation. Tears had gathered faintly at the corners of her eyes, and her lips had gone pale, only heightening the plea. Guilt at betraying her sister again and the desire ruling her body tore her between them.

That look only stoked Taeseok's excitement higher. Instead of answering, he dragged the head of his cock along her entrance and laughed low in his throat.

"I do feel bad. But… what am I supposed to do when I want noona too? And our Eunjeong… she'll understand what I'm doing."

Hearing him call her "noona" instead of "ajumma" made her body tremble faintly. And the way he spoke her sister's name felt wrong, alien.

"Understand? What woman in the world would understand something like this."

"I don't know. Still… I think she would."

"Don't say insane things. Are you… seriously going to? We're going to get caught."

"I… don't care if we get caught."

He truly didn't. He was confident she would forgive everything he did. And in another sense, he was curious what Eunjeong would do if she ever saw him with a woman who wasn't her.

The head of his cock pushed into her. Just that much — and then Taeseok asked again.

"Do you really hate it? Tell me. We're out of time."

He spread her thighs wider and began easing just the tip in and out of her entrance, over and over.

"Haahk~ haahk~ You crazy bastard… this is really…"

She was supposed to say she hated it… but she wanted him inside so badly. She wished he would just stop asking and bury himself in her. But Taeseok still only teased her with the head, waiting for her answer.

"You son of a bitch… fine. Put it in."

She said it and turned her face away in shame.

Taeseok smiled faintly and rolled his hips forward. His cock sank into her in a single deep thrust.

"Hnnngh…!"

Eunsu's back arched like a bow; she clamped a hand over her mouth to smother the moan that spilled out. The moment his cock filled her deep, that same unidentifiable energy surged into her body like a storm — far more overwhelming than what she had felt yesterday. His thickness, his heat, the sheer fullness of being packed to the brim blasted away what little reason she had left in one stroke.

"Haang~♡ You're insane… you actually ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠put it in. You bastard…"

Eunsu gasped and clutched his T-shirt in both fists.

"It's a little late to start acting like that. You wanted it too, noona. You spread your legs yourself. You told me to put it in."

Tears welling, Eunsu glared up at him.

"You crazy little shit… did you want to fuck both of us sisters… one after the other? Do you get off on doing this to us?"

"Yes… I love it. I love it so much I'm going crazy."

"Hnn… hurry… finish already. I don't want Unnie to catch us like this."

"Alright. I'll do my best."

Taeseok's pace quickened. He didn't care if they were caught — but there was no need to get caught on purpose. That was what made it thrilling…

"Hnnngh…! It feels… too good… we shouldn't… be doing this… aahng…!"

Eunsu clung to his neck, grinding her teeth to hold the moans down.

Then Eunjeong's bright voice floated in from the kitchen.

"Eunsu, want your coffee… iced?"

Eunsu's body went rigid. She dug her fingers into Taeseok's shoulder and forced out an answer in a shaking voice.

"Ah… y-yeah… iced, please."

"Taeseok too?"

"Yes… iced for me as well."

"Okay~"

Right after Eunjeong's voice, came the clink of ice dropping into a cup, then the fridge door shutting. That meant they had maybe a minute or two of leeway before she brought the tray out.

"Looks like we're really out of time."

"Hurry up and come… my heart's going to explode."

Eunsu begged in a voice close to tears. Her sex clenched madly around his cock, urging him toward release.

"Got it."

Taeseok stopped holding back. His hips began to drive hard and fast.

Thwap! Thwap! Thwap! Thwap!

The sofa shook violently as her firm, elastic ass slapped against his pelvis.

"Hnnngh…! Faster… please…"

One hand clamped tight over her own mouth; the other pulled at Taeseok's ass as her whole body shook. Taeseok didn't hold on any longer — he poured his hot seed into her deepest place.

Spurt—

Spurt—

Spurt—

"Ugh…!"

Eunsu shuddered hard as orgasm crashed through her. Pleasure wrapped around both of them, but there was no time to savor the afterglow. The clink of coffee cups being set on a tray sounded from the kitchen; Taeseok pulled out of her at once and yanked his pants up. Eunsu scrambled to drag her hot pants back into place.

Almost in the same breath, Eunjeong's footsteps approached. Seeing the two of them sitting a little apart, faces flushed, she tilted her head.

"What? You two… why are you sitting like that? Did you fight?"

Eunjeong asked as she came toward the sofa with the coffee tray. Eunsu startled upright and answered with all the nonchalance she could fake.

"Fight? What would I have to fight about with a kid like him? I'm just taking my coffee to my room."

She snatched a cup off the tray and stood as if fleeing. Eunjeong watched her little sister with a puzzled look, then turned to Taeseok.

"What's with her all of a sudden? You two really didn't fight?"

Taeseok leaned back into the sofa and smiled, completely at ease.

"Who knows. I have no idea either."

He took a sip of the coffee Eunjeong had brought and watched Eunsu's retreating back.

Eunsu hurried out of the house and headed straight for her fitness club. She passed the front counter, greeted her staff, and went inside without slowing down. After changing clothes, she took her usual place in front of the mirror, the same as every day.

She stood there for a long while, doing nothing but looking at herself. It was a trainer's gaze — not the soft appraisal of "pretty" or "nice," but eyes that read proportion, ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠line, balance, and density all at once.

And yet.

"…Huh?"

A faint, almost imperceptible wrongness pricked at her. Hard to put into words, but impossible to ignore.

Something's different.

Her eyes traced her own body of their own accord. Shoulder line. Collarbones. Chest. Waist. Hips.

Without a word, Eunsu tugged her training top up a little and tensed her abs. The definition that appeared was sharp and clean.

"…Was it always like this?"

She muttered under her breath. She recorded her body every single day — weight, body-fat percentage, muscle mass. Even how she felt, the pump, the fatigue in each muscle group. As a trainer, she considered it the bare minimum, and she had never skipped a day.

And by that standard, the change she was looking at now…

This doesn't make sense.

Eunsu narrowed her eyes slightly. The density of her core. The elasticity of her skin. The grain of the muscle. This wasn't just "looking better."

It was more like…

It got cleaned up?

As if unnecessary fat had been stripped away. As if every line had been drawn sharper. This was not a change you could build with a few short workouts. It was absolutely not a change that could appear overnight.