Not by Desire, But by Necessity (Eun-jung, Eun-su)

“Tae-seok, are you up?”

Her voice was as warm and gentle as ever.

She clearly knew he had just come out of Eun-su’s room, yet her expression showed no change at all. If anything, her smile was even softer, even more tender.

Tae-seok felt a flicker of confusion.

…Why is she so calm? Is she really okay with this?

He looked at Eun-jung and wondered inwardly. Guilt weighed on him—the guilt of handing her over to another man, of even laying hands on her younger sister. Her unaffected demeanor and gentle smile only made the discomfort sharper.

At the same time, he marveled once again at his own power.

Did I turn her into a woman who understands and forgives me no matter what I do?

He stared at her steadily. This was no longer mere understanding. It was obedience. ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Absolute obedience.

Have I… broken her too much?

The thought made him want to pull her into his arms again, more than it made him feel sorry.

He walked slowly toward her.

“Yeah. I’m up. Are you already making breakfast?”

“Mm… You worked hard yesterday, so I have to help you recover your strength.”

Eun-jung naturally stepped into his embrace and rested her face against his chest.

“You… won’t throw me away, right?”

A woman preparing breakfast for the man who had just slept with her sister, terrified of being discarded. In that instant, every trace of guilt vanished. The way she looked at him, needing him so desperately, only made him want to crush her further.

She’s satisfied with nothing more than being held by me. Our Eun-jung is…

This wasn’t a sin. She wasn’t broken. It was simply the change his ability had created.

There’s no need for guilt. All I have to do is hold her once more.

Not just Eun-jung. Eun-su too. And whoever came after them. As long as he possessed the power to make anyone his whenever he wished, there was no longer any reason to hesitate.

Tae-seok tightened his arms around Eun-jung’s waist.

…I need to become even more shameless from now on.

Eun-su couldn’t bring herself to sit at the table and eat with Eun-jung. The moment her sister and Tae-seok began their meal, she slipped out of the house as if fleeing.

Upon arriving at her fitness club, she quietly entered the locker room. Standing before the mirror as usual, she slowly examined her own body. This moment had become thrilling, something she now looked forward to.

Last night alone… I came so many times I lost count. I must look even prettier now, right?

The breasts reflected in the mirror were noticeably heavier and more resilient. Her waist had narrowed further, while her hips and thighs—already toned from training—had gained even sharper definition and smoothness. Her skin looked softer and more luminous, and her overall proportions had become incomparably beautiful.

Eun-su cupped her breasts with both hands and smiled in satisfaction.

Insane… so pretty. At this rate, I won’t be able to stay away from Tae-seok.

Staring at her reflection, she recalled the overwhelming pleasure of being held by him the night before. Just feeling an orgasm makes me prettier? Where else can you find a cheat like that?

The moment she thought of Tae-seok, heat flared low in her belly. The sensation of his thick, hot length filling her completely, the way her body melted with every climax—it all came rushing back with vivid clarity. She pressed her thighs together and clenched her teeth.

Will this effect last forever? If he pushes me away… will I go back to how I was?

The thought sent another sharp pulse through her lower body. She could feel herself growing wet.

No. Focus. Work! Work!!!

Today was the day of fitness YouTuber Do-hyun’s private PT session. Eun-su checked her body in the mirror once more. The tight sports bra strained against her now-larger breasts, while the high-waisted leggings dramatically accentuated the firm lines of her hips and thighs.

Six months ago, Do-hyun had been the one to approach her first. The famous YouTuber with over a million subscribers had grown close to her while using the club. Eun-su, in turn, had hoped to leverage his fame for promotion. What began as a professional relationship soon turned physical, and that illicit affair became the decisive reason for her divorce proceedings.

Now their interest in each other had cooled slightly. Eun-su was preoccupied with the divorce; Do-hyun had found someone new. Still, training him always made her tense.

She took a deep breath and stepped out of the locker room. Do-hyun was already there, stretching. Clad in black compression tights and ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠a tank top, he slowly loosened his clearly defined muscles. When he spotted her, his eyes flashed—not with simple delight, but with blatant, curious hunger. He stared for a moment as if forgetting to speak, then smiled lightly.

“Director… what have you been up to lately?”

Eun-su frowned briefly. “Why?”

“I just… didn’t think a person could change this much.”

His gaze traveled slowly from top to bottom, openly appraising her.

“…Shut up. Get ready to work out.”

She cut him off coldly, but Do-hyun didn’t back down. Instead, he took a step closer and looked down at her.

“I’m genuinely curious. As a fitness YouTuber, this transformation looks like it’d make great content.”

“I don’t want to be used that way.”

“Come on… even if we’ve been a bit distant lately—”

“Stop talking nonsense and do twelve squats. Keep your knees from caving in on the way down.”

Eun-su deliberately kept her tone dry. Do-hyun shrugged, placed the bar on his shoulders, and began the movement.

“Deeper. Push your hips back.”

She stepped behind him at the necessary distance—nothing more. Do-hyun deliberately exhaled louder than needed. “Hoo…”

The sound reached her from close range. Her hands touched his waist to correct his form. In that moment, his gaze dropped stickily downward, tracing the line of her thighs over the leggings and the curves accentuated as she leaned forward.

“Good. Just like that…”

Tap.

His hand landed on the inside of her thigh.

“…Hey!!! Are you even focusing?”

Eun-su snapped at him. “Hands off!”

Do-hyun glanced at her face, then slowly withdrew his hand. “Ah, sorry.”

Yet the corner of his mouth remained curled upward. “You really are different now.”

“What is?”

“Your thighs… they’re not the same ones that used to squeeze my body.”

Eun-su’s face flushed instantly. “If you keep this up, I’m switching trainers.”

“Got it. That was pure praise, I swear.”

His reply was simple. “Still… I really want to touch ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠them.”

Eun-su’s hands froze. “…Don’t cross the line.”

Her voice was ice-cold.

After the workout, Do-hyun naturally reached toward her waist. “Director.”

“…What?”

Eun-su answered shortly, picking up her water bottle. He stepped right behind her and whispered in a low voice, “How’s your schedule today?”

It was an abrupt question, but the intent was obvious. She set the bottle down without replying. He moved even closer, his lips nearly brushing her ear.

“Clear some time after we’re done.”

Eun-su’s eyebrows twitched. She took a step back and spoke coldly. “You know that’s not happening.”

“Because of the divorce?”

Smiling, he lightly touched her waist. “We don’t even know when that’ll end. How am I supposed to wait until then? Your club’s ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠membership numbers seem a bit stagnant lately… If I feature it properly on my channel, I could easily boost them twenty percent in a month.”

Eun-su bit her lip. His offer was sweet yet dangerous. Using his influence would certainly grow the club, but the price would naturally be her body. He leaned even closer to her ear.

“Just once… like before. Your body’s gotten so pretty, I want to check it out.”

Eun-su remained silent for a long moment. Slowly, she turned her head to look at him—the man she had once slept with casually. She could have agreed lightly, yet Tae-seok’s face rose in her mind.

“Why? Don’t want to?”

Avoiding his persistent gaze, she clenched her fists. She knew she should refuse, yet practical concerns surfaced as well—club operations, divorce legal fees… In the end, she let out a small sigh.

“Fine. I’ll contact you after we’re done.”

A satisfied smile spread across Do-hyun’s lips, as if he had known exactly what she would say. He pulled her waist lightly toward him and murmured, “I’ll be waiting.”

Eun-su quietly shook off his hand and added in a cold voice, “Don’t do this here.”

Eun-su lay on Do-hyun’s bed, legs spread wide beneath his solid frame.

“Hah… hah!”

With her thighs hooked over his shoulders, he drove deep into her with powerful thrusts. His breathing grew rougher, his movements more exaggerated, as though flaunting his masculinity. Confidence radiated from him.

“Haa… Noona… feel that? My cock’s completely swollen right now. Can you feel how big it is? The moment women take this, they go crazy. You used to love it too.”

Grinning confidently, he thrust his hips harder. His firm, beautiful body moved exaggeratedly above hers—clearly defined abs rippling, pelvis driving powerfully. As if boasting, he deliberately pulled out slowly before slamming back in and declared loudly, “Look, this is a real cock. Do you know how tightly you’re gripping me? Squeezing like that… I’m going insane too. Noona… you’re about to die from pleasure, aren’t you? Huh? Say it.”

Eun-su clenched her teeth and swallowed her moans. “Haaang~ Shut up. Just keep doing what you were doing… hnnng…”

“You feel it, right?”

His voice was low, brimming with confidence. “Your body’s moving exactly the way I want.”

Do-hyun’s cock was certainly large and hard. Most women would probably have been satisfied with its girth and thickness. The old her certainly had been. But Eun-su’s body now remembered something from an entirely different dimension. Compared to Tae-seok, Do-hyun’s felt like a child’s. Depth, thickness, the sensation of being filled—everything was starkly different. The comparison itself felt insulting.

She laughed inwardly. …What is this? Next to Tae-seok, it’s completely baby-level. Was I really into a guy like this for a while?