Chapter 32: Breast Growth Trigger

Jinhae

Minji froze against my mouth.

A tiny sound slipped out of her. Her lips were warm, a little parted from the shock.

I pulled back a finger-width.

Color already climbing her throat.

“Was that a good gift?”

She nodded. Fast.

“Y-yes. Yes, Hyung. It was. It was a very good gift.”

I smiled.

I kissed her again before she could ask. Deeper this time. I tipped her chin up with my thumbs and slid my tongue along the seam of her mouth until she opened for me. She made another small sound into my mouth and pressed closer.

One of my hands left her face.

I found the loose overlap of her sleeping robe. Thin enough that the heat of her skin came through it. I slipped my fingers inside.

Minji jerked.

“H-Hyung— wait—”

“Shh.” I spoke against her mouth. “Family gift. Stay still.”

My palm covered her breast.

It was small.

The whole soft mound fit inside my hand with room to spare. Nipple already tightening under the center of my palm, a tight bud no bigger than the tip of my finger. I cupped her. Rolled my thumb once across that stiff peak and watched her knees dip.

She broke the kiss with a gasp.

“They’re tiny. Don’t look at them like that. They’re nothing. Mother’s are. I mean. I know they’re small.”

“I can feel them just fine.”

I pushed the robe wider.

The silk slid off one shoulder. Then the other. It caught at her elbows and left her bare from the throat to the waist. Nipples a soft pink that had gone dark and tight from the air and my hand. I covered both of them. My palms swallowed them. I squeezed.

Minji’s head tipped back. A broken little moan leaked out.

“Hyung. They’re embarrassing.”

“They’re mine to play with.” I pinched both nipples at once. Then a little meaner.

I focused.

Will sank through my palms and into the soft tissue under my hands. Mind Evolution painted the glandular map in cold blue. I wrote a new instruction into the meat.

Grow.

A slow rewrite. Months of it. The same heavy, veined, milk-ready weight Lady Seo carried. Then past it. I set the ceiling high.

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[BODY ALTERATION COMPLETE]

Target: Kang Minji

Breast Growth Trigger — Active

*— Template: Lady Seo Yunhee (exceed)

*— Onset: Gradual / 8–12 weeks

*— Peak: Heavy / lactational capacity high

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“It will take time.” I kept rolling her nipples between my fingers while I talked. “These are going to grow bigger than Mother’s.”

Her mouth opened.

“Bigger than Mother’s. Hyung, that’s not possible. People don’t just.”

“You will see.” I pinched. She yelped.

She stared at her own chest. At my hands covering it. Her voice went small.

“Will you… will you still like me? If they’re huge?”

I leaned in until my mouth was at her ear.

“Yes.”

Her whole body trembled.

“I’ll like them more. I need them that big, Minji. You’re going to nurse my children on them.”

She blinked.

“Nurse…? Nurse what?”

“Children.”

Minji’s hands tightened on my robes.

“Ch-children? Hyung, what are you saying?”

“Mine.” I kissed the spot just under her ear. Felt her pulse jump against my lips. “You’re going to have my children. I’ll put them in you one after another until these tits stay swollen year-round.”

She moaned, shocked.

“I can’t have my brother’s children. Father would. The house. People would.”

“If I convince Mother,” I said, “will you accept? Will you have my children?”

Her hips twitched.

“Hyung.”

I rolled both nipples again. Harder.

“Answer me.”

“Y-yes. Ah. Yes, if Mother says it’s allowed. I’ll have them. I’ll have your children.”

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KANG MINJI

Youngest Daughter of House Kang

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Affection ............... 92 → 96 / 100 ↑

Lust .................... 34 → 61 / 100 ↑↑

Trust ................... 97 / 100

Submission .............. 19 → 34 / 100 ↑↑

Fear .................... 41 → 29 / 100 ↓

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Relationship Status: Adoring Little Sister / Wife-path

*— Brother complex: rewriting toward wife

*— Breast growth: started

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I kept playing with her tits.

Thumbs circling. Fingers lifting the small weight and letting it drop. I bent and took the left nipple into my mouth. Sucked. Flicked it with my tongue.

“Hyung. That’s my. Ah.”

I switched sides. Bit the right one just enough to make her jump. Spit shone on both peaks when I pulled off.

“Listen to you. One kiss and two little nipples and you’re already this loud.”

“I’m not. I don’t mean to be.”

“I like it.”

My right hand left her chest.

It slid down the open robe. Past the knot of her sash. Into the gap of the sleeping trousers underneath.

Minji locked up.

“Hyung. Down there. I’ve never.”

My fingers found her cunt.

Completely smooth. No hair at all. Already slick in a thin shiny film that coated my first two fingers the instant I cupped her.

“You keep this little cunt shaved for someone, or were you always like this?”

Her face went scarlet to the roots of her hair.

“I just. It felt cleaner. I never thought anyone would. Hyung, please, I’ve never done anything.”

I dragged one finger up through the slit.

She was soaked. The folds parted around my fingertip like they’d been waiting. Her clit was a tight little pearl already standing up. I circled it once.

Minji’s knees buckled.

I caught her with the arm around her waist and walked her backward until the edge of the sleeping mat hit her calves.

“Lie back.”

“Hyung.”

“Lie back.”

She lay back.

The robe fell open around her. I hooked the sleeping trousers and the thin under-cloth and pulled them down. Off her feet. Dropped them on the floor.

She tried to close her knees.

I set a hand on each and opened them.

Puffy from the first touches. A clear string of juice already connecting her lower lips.

Minji covered her face with both hands.

“Don’t look at it like that. It’s embarrassing. It’s right there.”

“It’s pretty.” I settled between her thighs. “And it’s mine. I’m going to leave a memory in it so you don’t let anyone else near it.”

Father would try to marry her in the next three months.

Not anymore.

I stroked her with two fingers. Up and down the whole smooth slit. Gathering slick. Spreading it over her clit. I didn’t push inside. Then a mean little flick that made her hips jump off the mat.

“Ah! Hyung. That’s. I can’t.”

“You can. Breathe.”

I leaned over her and kissed her again while my fingers worked. She moaned into my mouth. Her hands left her face and grabbed my shoulders.

I broke the kiss and put my mouth back at her ear.

“This is so you remember who you belong to when some lord’s son comes with a marriage plaque. You tell them no. You tell Father no. You wait for me.”

“I will. I won’t marry anyone. I don’t want anyone else.”

“Good girl.”

I pressed the pad of my middle finger to her entrance. Just the tip. The tight ring fluttered and tried to suck me in. I didn’t give it more than that. I rubbed there. Circled. Used her own juice to keep it wet while my thumb stayed on her clit.

Minji’s voice went high and broken.

“Something’s happening. Hyung. I feel like I have to. I have to pee or I don’t know. Please.”

“You’re going to come. That’s what that is. Let it happen.”

“Come? Like in the books the maids hide?”

“Exactly like that. Except it’s your Hyung’s hand on this bald little cunt, not a book.”

I sped up.

Wet sounds filled the chamber. Schlick. Schlick. Her hips started chasing my fingers on their own.

I glanced past her shoulder.

The side lattice was open to the night air.

Ahyun knelt in the garden bed where I had left her. One hand buried under her hanfu.

Further back, half in the shadow of the covered walk, Lady Seo.

The cold mask was gone. She stood in the dark with one hand on the wooden post like she needed it to stay upright. Her eyes were locked on her daughter’s face. On the open mouth, and on the way those slim thighs shook around my wrist.

I held Lady Seo’s gaze over Minji’s shoulder.

And I rubbed my sister’s clit faster.

“Look at me,” I told Minji.

“Say my name when you finish.”

“H-Hyung.”

“The other one.”

“Jinhae. Jinhae. I can’t hold. I’m.”

She broke.

Her whole body seized. Back arched. Small tits lifting. A shocked cry tore out of her throat as the first orgasm of her life ripped through her. Her thighs clamped around my forearm and shook.

I worked her through it.

Every spasm. Every broken hitch of breath. I kept the circles tight on that swollen clit until she tried to twist away and I didn’t let her. Until the cry turned into a wet sob and then into my name again, smaller.

“Jinhae. Hyung. Please. It’s too much.”

I eased off.

Left my hand cupped over her dripping little mound.

Minji collapsed into the mat. Chest heaving. Eyes wet. A dazed smile.

I smiled at her once.

Then I leaned down and kissed Minji.

When I pulled back I stayed close.

“I’ll see you in a year.”

Her eyes filled.

“A year? Hyung, that’s so long.”

“A year.” I kissed the corner of her mouth. “Be good. Don’t let anyone else put a hand where I just did. When I come home I want this same little cunt waiting for me. And I want those tits heavy.”

“I won’t. I promise. I won’t let anyone. I’ll wait.”