Training the Siblings (1)
After a night of intense lovemaking that had lasted until dawn, Do Dayul woke in Kim Seonwoo's arms with a blissful smile. The morning sunlight filtering through the curtains illuminated his face, making it look as perfect as a sculpture. Recalling the memories of the previous night, she blushed at the fact that her first lover was such a flawless man.
Seonwoo greeted her tenderly and they enjoyed a room service breakfast together. Throughout the meal, he perfectly played the role of a caring boyfriend—scooping food onto her plate, wiping sauce from the corner of her mouth, and more. He even escorted her all the way home. Before she got out of the car, he took her hand with a reluctant expression.
"Last night was amazing. I'd love to see you more often—what do you think, Dayul?"
"Yes! Me too!"
Do Dayul nodded eagerly. It was the first love of her life.
For the next week, the two of them enjoyed sweet dates like any ordinary couple. On a weekend evening amid the bustling crowds, Seonwoo naturally took her hand.
"It's crowded, so don't let go."
Blushing, Do Dayul nodded at his words. The movie was the latest blockbuster action flick. When monsters suddenly leaped out accompanied by explosive blasts, she instinctively flinched. Each time, Seonwoo gripped her hand tighter on purpose. Feeling his firm, warm grasp, her heart pounded with excitement rather than fear.
After the movie ended and they stepped outside, Seonwoo grinned mischievously.
"I don't remember a single thing from the plot."
"Huh? Why? Wasn't it fun?"
"No, I was too busy watching your face. Your expressions every time you got startled were so cute—I couldn't look away."
"Oh, come on!"
She lightly swatted his arm in embarrassment, but the smile spreading across her lips was impossible to hide.
Next up was a gourmet adventure. Seonwoo led her to a high-end restaurant in Gangnam.
"Wow... Reservations here are impossible to get. How did you manage it?"
Do Dayul asked in surprise.
"Hmm... I just used a little special method."
Seonwoo had searched it up on his smartphone and secured a same-day reservation through a booking agency by throwing money at them.
"Come on in. I'm starving."
As soon as the food arrived, he cut the tenderest part of the steak and placed it on her plate first.
"Try it. It has to suit your taste."
Do Dayul fell for him all over again at his thoughtful manners.
Working out together at the gym and sweating side by side became their new routine. On purpose, during the final set, Seonwoo pretended to be exhausted while struggling with the barbell.
"Hngh... Ah, I can't do any more."
"No! You're almost there! One more! You can do it!"
Do Dayul stuck right by his side, cheering him on with all her might. She fidgeted anxiously, correcting his form and wiping his sweat.
One day after their workout, she shyly handed him a shopping bag.
"This... I made it myself. Eat it after training!"
Inside was a homemade chicken breast salad bento, prepared with care. While satisfied with her devotion, Seonwoo was starting to grow bored of this boyfriend charade. He felt an urge to test her service talent in a different way.
After parting with Do Dayul, he called Park Yuna from his car.
"How far along are you with training the puppy?"
"Hmm, about halfway? Just teasing his dick? He was dying for it—adorable."
Park Yuna's delighted voice came through the phone.
"You're fast. Guess I need to step it up."
"She wants it in, but she's too timid to say. Of course, I won't."
"Heh, good job. Make it so she can't even masturbate without thinking of you."
"Already seems like that. She even said I'm her first girlfriend? Super easy."
"Perfect. Keep it up. I'll call when it's time for the next phase."
After hanging up, Seonwoo decided it was time to end the lover act with Do Dayul and begin her real training.
That night, Seonwoo spent another passionate evening with Do Dayul in a hotel room. The week of sweet romance had deepened their bond, leaving her completely open to him. As they embraced, slick with sweat after sex, Seonwoo spoke with a serious expression.
"Dayul, the truth is... I'm not into ordinary relationships."
Her body stiffened at his sudden confession.
"I get pleasure from making women mine, forcing them to submit, and sometimes handling them roughly."
She was too shocked to respond, feeling like she'd been abruptly cast out of a sweet dream. But already deeply enamored, she didn't want to lose him.
"If... if that's what you want, Seonwoo... I'll try."
Her voice trembled, but it was sincere.
'Hook, line, and sinker. Service S+ really is on another level.' Seonwoo smiled inwardly at her obedient response and began her education.
"Then, from now on, call me 'Master.'"
"...Pardon?"
"Master. Say it."
Do Dayul hesitated, her face flushing with shame. But under his firm gaze, she finally whispered softly.
"...Master."
"Good girl."
Seonwoo stroked her hair in praise and rewarded her with a gentle kiss. Command—obey—reward. The basic formula of training began to imprint on her.
He whispered in her ear, words that trampled her dignity and established their new dynamic.
"From now on, I won't treat you like a lover. You're my property, existing solely for me. Especially your body... it'll be used to satisfy my desires. That's how you'll please me."
He ordered her to get on all fours. When she assumed the position without hesitation, he brought his palm down hard on her firm ass.
Smack!
"Ahng!"
"Answer me, my bitch. Can you do it?"
Amid pain, humiliation, and an inexplicable thrill, Do Dayul whimpered her response.
"Y-yes... yes, Master...!"
With her reply, their lover relationship crumbled completely, giving way to a master-slave dynamic. Seonwoo smiled in satisfaction and whispered his next command in her ear.
"Good. Time to serve. Come here and suck it."
Do Dayul hesitated briefly but soon resolved herself, sliding off the bed to kneel before him. With trembling hands, she grasped his hot shaft and awkwardly took it into her mouth.
"Mmm... slurp..."
Clumsy at first, her eyes burned with desperate determination to please her Master. Seonwoo gently stroked her hair, then suddenly grabbed a fistful and yanked.
"Ahng!"
"Deeper. Swallow it to your throat."
He pressed her head down, shoving himself deep into her throat.
"Gag, glrk...! Hurk!"
Tears welled in her eyes from the choking pain. Seonwoo waited until she dry-heaved, then softly stroked her hair again.
"Such a good girl. Doing so well for your first time."
He pulled her up and positioned her on all fours on the bed again. Then he began spanking her plump ass hard with his palm.
Smack! Smack!
"Ah! Ang! Master!"
After leaving vivid red handprints, he mounted her from behind and thrust in.
"Hngh...!"
As he moved his hips, he reached forward and pinched her nipples hard.
"Ahn! It hurts, it hurts! Master!"
"Your pussy's soaking even though it hurts? Liar, my little bitch."
Sneering, he slammed in to the hilt.
"Haaang!"
Seonwoo showed no mercy. He yanked her hair to lift her head and pistoned his hips like a beast. His fingers twisted her nipples harder, and her ass burned hot.
"Ah! Ah! Master! I-I'm cumming! Gonna cum!"
She screamed in climax. But Seonwoo didn't stop. He pinned her convulsing body and drove deeper, whispering.
"Not yet. You cum when Master allows it."
Waves of pain and pleasure crashed over her relentlessly. Her mind went blank, filled only with the sensations he gave her and the sound of his voice.
"You're mine now. Your body, your heart—all of it."
"Hngh... ah...! Y-yes... yes... Master...♡"
"You were born to serve me. Understand?"
"Yes...♡ Hngh...!"
Each time he spoke, her body reacted more sensitively, climaxing again and again. Second, third... she lost count. Finally, when Seonwoo poured his hot seed deep inside her, Do Dayul blacked out, trembling violently beneath him. In her ears echoed only her Master's voice: 'You're my bitch. Obey me.'
