The Story of How Producing My Timid Older Sister Developed My Sexual Preferences

Chapter 006: My First Breasts

・Sorry

I’m coming home now

Around 6 PM

I sent the message to my sister, and it was marked as read almost instantly.

・Understood.

I was surprised she replied. Maybe she was trying to show she wasn’t angry about yesterday, or perhaps it was out of guilt for showing me her body that she thought was disgusting.

Whoa, the body I was trying to forget was about to flash back into my mind. I quickly replaced the image with the lewd time I spent with Shiori earlier today.

Still, today was really fulfilling. My heart and balls felt lighter, and I headed home feeling refreshed. This summer is going to be fun.

“I’m home.”

When I opened the living room door, there was my sister in her usual outfit. As stuffy and baggy as ever.

“…Welcome back.”

She stood up from the sofa and hurried into the kitchen. There was no smell of cooking at all, so I had no idea what dinner would be.

“What’s for dinner tonight?”

She took a large plate wrapped in plastic from the fridge and set it on the table. Shredded egg, julienned cucumber, white scallions, tomato, and crab sticks.

I see — hiyashi chūka (cold Chinese noodles).

“Oh nice! I didn’t have much appetite because of the heat, but this looks really good.”

My sister took out two pots of different sizes, filled them with water, and put them on the stove. She then took out Chinese noodles and pork belly from the fridge.

She held up her index finger, paused, then raised her middle finger too. She was probably asking if I wanted one or two servings by showing how much noodles to boil.

She stared at me with her usual emotionless face, waiting for my answer. Suddenly, I remembered her bright red face from this morning and compared it to her current expression.

I pulled out my phone from my back pocket, turned on the camera, and snapped several photos of her holding up two fingers with a blank face. Click, click, click.

Startled by the sudden shutter sounds, her eyes widened and her straight fingers curled limply. After a moment, once she realized what had happened, her cheeks gradually turned bright red.

“Haha~ You rarely do peace signs, so I thought you wanted me to take a picture.”

“……”

My sister looked down and started trembling. It’s kind of nice… Seeing her get emotional like this… It feels nostalgic somehow…

“I’ll send them later— Whoa!?”

With a speed I’d never seen from her before, she charged at me, tears in her eyes, desperately trying to snatch my phone.

“So strong!”

Surprised by her unexpected power, I raised the phone high above my head. With her at nearly 170cm and me at 180cm, she shouldn’t be able to reach it. Or so I thought — she started jumping up and down.

“Nn… fu… nn!”

“Whoa, impressive jumping power!”

She herself probably didn’t notice because she was so desperate, but her breasts were bouncing wildly — boing boing — and slamming into my body. The incredible weight and softness were transmitted clearly even through her loose, stuffy sweatshirt.

“Nn… ha… nnn~!”

This is amazing. I wasn’t even that much of a breast guy, but this is really good. It doesn’t matter if they belong to someone else or even a family member. Breasts make people happy no matter whose they are. I was genuinely impressed.

It was my first time feeling this sensation. Wait… Have I never actually touched breasts before…? That’s right — I was a breast virgin. Of course I had groped and sucked on several girls’ chests before, including Shiori’s today. But those weren’t breasts. This is what breasts are.

“Nn! …Ha! …Fun…”

Every time she jumped, they pressed mugyu mugyu against my elbow and chest.

Come to think of it, none of the breasts I had touched before were D-cup or larger. Does that mean anything under D-cup can’t truly be called “oppai”…? I was shocked by this earth-shattering realization.

Does that mean Shiori can never have real breasts for the rest of her life…?

And just how many cups is this incredible sensation…?

Ah… I got too focused on the breasts and nearly lost my phone.

“Breasts! Your breasts are hitting me, Sis!”

“！！？〜〜〜！！！！？”

She instantly crouched down, covering her chest with incredible speed I’d never seen before, and started trembling again. Maybe I went a bit too far.

“Phew— Sorry. I won’t delete the photos, but… sorry, okay?”

“Haa… haa… haa… haa…”

She was breathing way too hard. Well, it’s been a while since I’ve seen her move this much.

“Look, the water’s boiling. I’ll boil the pork belly.”

“Haa… do… it… haa… do it…”

“No, I was thinking… I didn’t have a single photo of you, so it’s fine, right? Just one picture.”

“Fun… fun… fun…”

She seemed to have caught her breath a little. Still crouched, she breathed through her nose, but the cheek I could see was still bright red. She suddenly stood up, moved to my right side as if nothing had happened, and started putting the pork belly into the smaller pot. However, she kept her face turned sharply away from me.

“You should watch your hands or you’ll burn yourself.”

“……”

“Are you sulking…? Or embarrassed…? Oh, I’ll take two servings. That little fight made me even hungrier.”

The larger pot started boiling too. Turning her back so I couldn’t see her face, she opened a bag of Chinese noodles (enough for three servings), dumped them all in, and pressed the timer. Even with the AC on, boiling two pots made it pretty hot. On top of that, her wavy hair was damp with sweat from the earlier intense “exercise” and stuck to her neck. It was just that sight, but it made my heart pound strongly.

Erotic——

There it was again. Emotions I shouldn’t be feeling toward my sister were rising up.

I quickly looked away, but it wasn’t just visual. Whether from her scalp or from inside those stuffy clothes — probably both — a slight sweaty scent mixed with something vanilla-like, milky, and creamy stimulated my nose. It was sensual yet comforting, like an aphrodisiac perfume. The deeper I smelled it, the more my vision blurred, and electric signals shot from my brain through my spine straight to my lower body. Despite having ejaculated twice today, my body was taken over by that irresistible scent. I moved closer to my sister… and buried my nose behind her ear.

“Hyuuu!!!!!!!” Twitch!

A voice louder than I had ever heard from her burst out, instantly bringing me back to my senses. Shit. What the hell was I doing? My body had moved on its own as if I had been brainwashed.

My sister stared at me in shock. I tried to think of an excuse, but nothing came to mind.

My painfully throbbing erection moved awkwardly inside my pants. I worried she might notice.

“Ah, um… You were sweating a lot, so… Wait, uh… that…”

What the hell am I saying? Why would I sniff her just because she was sweaty? Am I a pervert? I couldn’t even make a proper excuse for an action I apparently did unconsciously — well, I did do it. I was completely flustered.

This was the fourth time her face had turned bright red since yesterday. With another uncharacteristically fast movement, she left the kitchen and rushed upstairs. The pata pata sound of her slippers was unusually quick. I thought about meaningless things like that. I really fucked up.

I adjusted my boner while holding my head in my hands.