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

Chapter 014: Morning of Humiliation ☆

What the hell is this? It feels way too good. I know I’m getting a blowjob, but this sensation is nothing I’ve ever experienced before. My entire huge cock is swallowed to the base, wrapped tightly, while a tongue moves all over it as if playing with it. Yet it feels somewhat clumsy and inexperienced. It’s comfortable, but also itchy.

There are muffled wet sounds — kuju, kuju, kuo, kuo.

I’ve never experienced anything like this, and normally it should be impossible. After all, my cock is thick, hard, and around 20 cm long. There’s no way it could be taken so deeply.

I tried to check what was happening, but my eyes wouldn’t open. As I desperately struggled to force my eyelids open, the unidentified person released my sloppy, dripping cock from their mouth.

The mysterious figure moved, crawling on top of me. The weight terrified me. This person was definitely bigger than me, even though I’m taller than average. I tried to push them away, but not only could I not open my eyes — my body wouldn’t move at all. Is this sleep paralysis? Cold sweat wouldn’t stop.

Then I heard a faint child’s voice. A girl’s voice. Nothing made sense anymore.

The only senses still working were touch and hearing. I strained my ears to make out what the voice was saying.

“…It’s okay… don’t be scared…”

A gentle, reassuring voice.

“…I’ll make you feel good… I’ll do it for you…”

An excited voice that didn’t sound childlike.

“…Right…? Baby…”

A voice filled with maternal affection.

『…I’m putting it in… okay?』

The shock of the last words made my frozen body twitch. My eyes opened just slightly.

It was blurry, but I could tell it was a girl. Her silhouette looked more developed than a child, yet she felt far too heavy. Her smooth, hairless mound was puffy like a steamed bun, with a deep slit clearly visible even from the front. It was approaching the head of my rock-hard cock, trying to devour it.

No way. It’ll never fit. Stop, please stop, it’ll break!

There was a nuchi sound as our mucous membranes touched. It was scalding hot and meltingly wet.

Stop! Stop! Stop! Please stop! I struggled desperately, but my body still wouldn’t move.

And then, without any resistance, my oversized cock was swallowed all the way to the base in one go. The moment it entered, there was an abnormal suction and a wriggling sensation like bugs crawling inside. The urge to cum hit me instantly.

No!!! I’m cumming!!!!!!! Inside is bad! Move!!! Get off!!! Get off me!!!

“GET OFFFFFFFF!!!!!!!”

My body finally moved. I shot upright as if shoving someone away, but there was no one at the end of my outstretched arms.

“Ugh… ah…”

My rock-hard cock was twitching violently inside my underwear, pumping out semen.

“What the hell was that…?”

I looked around to understand the situation. It wasn’t the dimly lit room from the dream — sunlight was streaming in through gaps in the curtains. My loungewear was soaked with sweat, and the sheets were drenched too.

I had a terrible dream. I thought I’d experienced sleep paralysis, but it was just a dream. A very realistic one.

It was a dream about having sex with a child… Wait, what kind of child was it? The experience had felt so real I thought it actually happened, but it was already fading into something vague.

But it was definitely a dream about doing it with a young girl.

“Worst dream ever… I don’t have those kinds of desires… and I even had a wet dream…”

The first wet dream in my life was shocking enough, but a child was a hard no. Knowing it would be a disaster, I had been putting off checking my pants. I cautiously looked inside.

…It was a catastrophe. It had even soaked through my shorts.

I wanted to throw away this “lolicon certificate (provisional),” but these were new underwear. What should I do…?

I checked the time. It was only 6 AM. Good, they’re probably both still asleep. Mom definitely is.

I need to change anyway. Leaving it like this feels way too gross.

“Ugh… it stinks…”

I took off the sticky underwear, cleaned myself, and changed. I must have cum a ridiculous amount, but the fact that I felt almost no pleasure made me angry.

I should wash the sweat-soaked sheets too.

I’ll hand-wash the underwear and shorts, then throw them in the washing machine with the sheets.

As I quietly headed to the washroom, I heard the sound of the TV from the living room.

“Worst timing… Sis is already up? It’s too early. She’s gonna think I wet the bed.”

I could be seen through the glass door, but if I moved as fast and quietly as possible… Sis is slow to notice things, so she probably won’t realize.

I wrapped the underwear and shorts inside the sheet to hide them, then tiptoed past the door like a ninja.

…Good, no shadow chasing me. I should be safe.

Once inside the washroom, I spread the underwear and shorts on the clean sink and turned on the hot water. The shorts would probably be fine like this, but the underwear was the problem. When I ran strong water over it, the semen gradually flowed out and got caught on the drain strainer… Hey! It’s starting to clump!

I panicked as the semen refused to wash away and kept piling up on the drain. I opened the mirrored cabinets looking for an old toothbrush, but couldn’t find one. I frantically opened other shelves when suddenly a voice came from behind me.

“Good morning… What’s wrong…?”

“Uwaaaah!?”

My sister had appeared without any presence. In my panic, all I could do was hide the sink with my body. I couldn’t think of a good excuse.

“G-good morning! No, I was just looking for a new toothbrush…”

“…It’s right there.”

She walked closer. She clearly saw the underwear in the sink.

“Did you… wet the bed…?”

“I-it’s not wetting the bed! It’s not what you think, Sis! Believe me! I sweated a lot in my sleep! So——”

“It’s okay… I’ll wash it for you…”

My sister, who clearly didn’t believe me, smiled gently like she was comforting a small child and reached for the sheet on the floor.

“Y-yeah! The sheet! Smell the sheet! It’s fine! Just a little bit!”

“If it’s just a little…” Despite her reluctant tone, she took a big breath and buried her face in the sheet.

“Haaaa—— …M… Fuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu!!!”

I was speechless. While I stood frozen, wondering if she had lost her mind, she kept her face in the sheet and gave her impression.

“Sniff… It really is… sweat… Sniff… Huh? But… sniff… it smells like I’m surrounded by chestnut trees… sniff… like a swimming pool… but——”

“That’s enough!!!!!!”

Damn it. Wrapping everything in the sheet was a mistake — the smell of semen must have been trapped inside.

I snatched the sheet away from her face. For a split second she had a dazed, stupid expression, but my loud voice made her squeeze her eyes shut and start apologizing.

“I-I’m sorry…”

“I said just a little! This is embarrassing…”

“It didn’t smell bad… it was a little sweet——”

“Get out!”

“…Sorry… But, can I wash it?”

“I can do laundry by myself……”

“Ah, I’ll wash it…”

“……”

Completely reversed from normal, all I could do was nod silently. Come to think of it, I’ve never used the washing machine before. How pathetic.

While we stayed silent, I washed the underwear thoroughly, wrung it out, and tossed it into the washing machine where Sis was putting in detergent.

“Ah, if it’s just sweat, you don’t have to hand-wash it…”

“…Got it.”

I almost said “I know!”, but there was no need to drag this conversation out any further.

After Sis turned on the washing machine, she stood at the sink and started washing her hands.

“…Huh? The drain is dirty…”

Ah! I forgot!!

I was about to say I’d do it, but it was too late. She removed the drain strainer where my clumped semen was stuck and started scrubbing it with her bare hands.

“Huh… it’s not coming off easily. What is this…?”

She opened the mirror in front of her, took out an old toothbrush, and started scrubbing vigorously.

“So that’s where it opens…”

“…Hm?”

She didn’t catch my mutter and looked at me through the mirror. Her beautiful, smooth white arm moved back and forth. But her hands looked a little rough.

“…Thanks for always doing everything.”

The words slipped out naturally. Both I and my sister’s reflection in the mirror widened our eyes in surprise. I got embarrassed again and ran out of the washroom.

This humiliating start to the day is all because of that mysterious girl in the dream.

“I won’t forgive you. If I see you again, be ready.”

I don’t think I’ll ever see her again, but I don’t want another dream like that, so I declared war on the mysterious girl.

…Though, just a tiny, tiny bit… seeing Sis cleaning my bodily fluids with her bare hands did stir something inside me.

Chapter 015: Uwaaaah…

I impulsively ran away from the scene earlier, but honestly, I just wanted to take a shower.

I came back to my room, but since the sheets were stripped off, I couldn’t even go back to sleep.

“Damn it, sis…”

That weird, uncharacteristic move she pulled (sucking in the sheets) was probably payback for me constantly sniffing around lately. Yeah, that makes sense now.

Embarrassing. Only after getting hit with it myself did I realize… nah, I’m not reflecting at all. Revenge calls for revenge.

Still, it’s a relief to know that she’s not just aloof—she’s got a bit of a playful side too.

Plus, the misunderstanding about me wetting the bed has been cleared up. And she still hasn’t realized the truth—that I was washing the underwear I came in… let alone the absolutely unforgivable truth that she was rubbing my semen with her hand.

And those things will never be revealed in my lifetime. (Probably not a flag.)

Yeah, so there’s nothing awkward left between us. Saying “thanks for everything” like usual is important family communication… Alright, no need to overthink it.

I headed back to the bathroom, where the washing machine was rumbling loudly. I wanted to wash this too, I thought as I went to toss my sweat-soaked T-shirt into the laundry basket—only to find the shirt I had given my sister inside it.

I swear I have no wicked intentions. Really. I just compared the scent with my own. Even though we use the same detergent and fabric softener, and share the same blood, why do we smell so different?

“…Haaah~”

Something recharged inside me, and most of the shock from earlier faded away.

This place is dangerous. The bathroom is a cursed location for us siblings, so who knows what might happen next. Time to shower quickly.

I was supposed to go shopping today with my classmates for swimsuits and other stuff. I invited Shiori just in case, but she replied that she had club activities and couldn’t come. Even though it’s a holiday, she’s so dedicated. I texted back telling her to get even more tanned and do her best.

Oh right, before I went to bed yesterday, I was messaging with Reina-san about hair care…

“Huh? Did I reply to her last message?”

It was my first time chatting with an older woman. She didn’t end the conversation, so I just kept talking and talking. I enjoyed it, but I hope she didn’t think I was being annoying.

“Fuu, that feels better.”

After getting out of the shower, I headed to the living room.

My sister was there in just a T-shirt on top, looking cool as she watched TV and played with her phone. She seemed to be rotating the shirts I gave her. Today’s one was the smallest… I could clearly see her body lines.

“…C-Coffee… want some?”

Crap. She noticed me staring. She hugged her body shyly as she asked.

“Yeah, I’ll have some. Please.”

I watched her toddle off to the kitchen like a penguin, then checked my chat with Reina-san from yesterday.

・Thank you so much!

・No problem at all! Feel free to ask anytime.

・Yes! That helped a lot! I’ll message you again if I have more questions.

・Sure, but it’s just my opinion, so it might not suit the other person.

・Even so, it was really helpful.

・Glad to hear that!

I ended up not replying last night. Is this okay? Was it rude…? Man, I have no idea how to end these chats.

I fell asleep yesterday, sorry. I’ll reply now for good measure.

My sister came back with coffee, walking in that same penguin-like waddle. Probably because of those baggy pants.

“Thanks. Hey… if I buy some loungewear, would you wear it?”

“Eh…? What kind…?”

“Like shorts or something?”

“Mm… no way… my legs are too thick…”

She sat in her usual triangle position, hugging her knees and curling up.

I was about to say They’re not thick! but I couldn’t lie. Her lower half was actually slim, but the upper parts were… very assertive.

“I see. I’m going to buy swim trunks today anyway, so I thought I’d get something while I’m at it… but it’s fine.”

“Uu…”

“No need to look so down. I told you thick thighs aren’t bad, right? You said ‘thighs’ yourself, so of course they’re thick.”

“That’s not it…”

She started kicking her feet in a pout.

“Sorry, really, you don’t have to worry about it.”

“It’s not that… I… want them… but I’m embarrassed…”

Ugh, she’s so troublesome, but it really hits me in the heart.

Why does this make me want to tease her even more?

“No no, you don’t have to force yourself. I was looking stuff up on my phone yesterday thinking it might suit you, but forcing it isn’t good.”

“Uu… it’s not forcing…”

“You literally just said ‘no way’ a second ago.”

“I-I didn’t say that…”

That’s a pretty big lie.

I felt bad about making my almost-adult sister regress into baby mode any further, so I gave in.

“Alright, if you say that much, I’ll buy some for you.”

Her kicking feet stopped, and her toes curled tightly.

“…Thank you.”

A clumsy smile peeked out from between her arms.

“What size?”

“……S… S… Three…”

She kept mumbling “suri” and wouldn’t get to the point.

“Huh? You mean S, M, L?”

“Uu… Three L…”

…Three L? When did a size I don’t know about get added? I’m already at my limit with Starbucks sizes.

“…???”

“I said 3L! Around XXL!”

“…!? Hu—!??”

I barely stopped myself from blurting it out, but a little slipped.

“!?… You called me fat!!! Uu~ uuu~”

“N-No! I said big! I meant it’s big! Hey! Wait…!”

She shook her chest as she stormed out of the living room.

I was teasing her at first, but the last part was unintentional… I made her cry.

So people really do go “Uwaaaah” when they cry…

My phone vibrated. I thought it was my sister sending complaints, but it was Reina-san.

・Good morning! Totally fine, you’re up early.

・Good morning. By the way, is 3L an unusual pants size for women?

・Shimizu-kun, do you have a thing for bigger women?

Bigger women probably means plump women… Since there seem to be a lot of misunderstandings since yesterday, I replied gently that it was about my sister and that I’m definitely not a siscon.

After that, I chatted with a few other people while watching TV.

It was still early, but I should start getting ready soon——

BANG!!

“Hey you… You made your sister cry, didn’t you!”

I knew who it was from the completely tactless way the door was slammed open, but I still jumped when Mom suddenly snapped at me without even saying hello. I instinctively went into defensive mode.

“I-It wasn’t on purpose! T-Time out! Time out!!”

“I was supposed to teach her makeup today, and now her eyes are all swollen!”

That’s what you’re mad about!!

Thank god I didn’t get a bruise on my shin.

I finally noticed my sister glued to Mom’s back. So she snitched, I thought, but seeing how tightly she was gripping Mom’s arm, it was probably Mom who forced the confession.

“Sorry, sis. I was looking forward to the makeup too. Also, like I said earlier, I’m going out so I don’t need lunch.”

“…Okay.”

“You’re going out? Where?”

“Shopping. I need a new swimsuit and other summer stuff. There’s a lot I need.”

“Hmm. You should’ve bought a rash guard too. I gave you the card, so you can buy online.”

“…I-I’m not going swimming… so I don’t need one.”

If you’re not interested, don’t ask, I thought, but wait a second…

“…Huh? You gave sis the card?”

“Of course I did. Who do you think buys all the groceries? You think food just magically appears in the fridge?”

So annoying.

And unfair. So unfair. Only sis gets it. But I kept a straight face. I tried to use this opportunity to negotiate for some allowance.

“I get that, but for swimsuits and stuff… I don’t particularly want anything, but I’m in my growth period, so sizes don’t fit anymore. Sandals are getting tight too. It’s not like I want to dress up, so in that sense it’s kind of a necessity, or maybe not…”

“It’s not. Even if you can’t go swimming, no one’s inconvenienced. Do you even know what ‘necessity’ means? The detergent Shizuna uses for the laundry she does every day, cleaning supplies, shampoo, body soap, toilet paper——”

“I understand… I’m sorry.”

“All of it. Shizuna buys everything. Detergent is pretty heavy, you’ve never even carried it, have you?”

“…No, I haven’t.”

“Not just buying it, but restocking and replacing everything too. Have you ever done anything? No matter how many times I tell you about the toilet paper——”

“…No.”

“You’re really spoiled, aren’t you? You just play around all day, food appears by itself, and you get to live in a clean house without lifting a finger. Right, Shizuna?”

“I-I… do it because I like to…”

I only tried to get some allowance and now I feel like crying. This is bad, I’m seriously about to cry…

I sprinted out of there at full speed and dashed back to my room.

I was about two seconds away from letting out an “Uwaaaah!!” myself.

Chapter 016: When One God Throws You Away, Another Picks You Up

I was supposed to meet up with my classmates at the big shopping mall at 11 AM, but after being relentlessly teased and having my dignity completely destroyed this morning, I didn’t want to stay home any longer. I left for the downtown area an hour early.

While I had time alone, I decided to look for loungewear for Sis and entered a fast-fashion building. The men’s and women’s sections were on different floors.

It felt a bit embarrassing walking around the women’s floor alone as a guy, but I firmly believed that a wonderful future awaited me if I could overcome this.

Trying not to worry about weird looks, I finally found the loungewear section.

The issue was sizing, but thanks to Reina-san’s excellent advice this morning, I thought I could manage. When I described Sis’s body type, she gave me precise recommendations.

According to Reina-san, with 3L sizes, it’s fine for people who are simply overweight, but if there’s a big difference between waist and hips, it can be tricky — especially with straight or skinny pants. However, with current popular wide-leg pants and loose silhouettes, many items in L size would still work if they have room around the hips.

Loungewear tends to be especially loose-fitting, so flared styles are good. Stretchy material would be ideal.

Reina-san is so glamorous and probably has a busy, fulfilling private life, yet she took the time to explain all this in detail to a kid like me from the morning. I’m nothing but grateful.

While I was wondering which one to get, my eyes stopped on a description tag in the corner.

『A style with minimal bagginess at the waist and ample room from the hips to the thighs.』

This is it! Since she has pale skin, a darker color would probably look good. I picked it up and spread it out. The size tag said it could fit up to 105 cm hips even in S size. This should definitely work. Decision made.

Since I hadn’t replied to Reina-san’s last message, I took a photo and sent it to her for her opinion.

I didn’t know if she’d reply, but while I was wandering around the store, I finally found it… a bodysuit. This is insanely revealing. I have no idea what the intended use is, but to my eyes it looks like refined modern art.

I want it. I desperately want to see someone wearing it. But… I don’t have the courage to take this bodysuit and a pair of short pants to the register together. Damn it!

Ping

Reina-san replied.

・I have one too~ I’m wearing it right now! Different color!

“…………”

My throat made a loud gulp. My sixth sense screamed at me to save it immediately. Saved. Reina-san had sent a photo of herself wearing the pink bodysuit, sitting on what looked like a sofa or bed. Her face wasn’t visible, but her slender, beautiful thighs extending from the short pants were clearly shown.

Does she not understand a high school boy’s sex drive? Or does she understand and is teasing me on purpose? Could she actually be a bad witch who only eats younger guys…? No, no way.

When I tried to reply, the photo suddenly disappeared with a “Message unsent” notice.

・Sorry! I got excited because it was such a coincidence and sent it on impulse… Did you see it?

・No, I didn’t get to see it. It really was a coincidence! I’ll go with this one! Thank you so much!

Damn… Reina-san is cute too. She’s just a senior from my part-time job. Nothing more. That’s what I keep telling myself, but my heart still flutters and I start hoping.

Wait — if I send her a photo of this bodysuit, maybe I’ll get another reward photo? The thought crossed my mind for a second, but even kind Reina-san would probably be grossed out and block me if I acted like a perverted old man.

Still… she seems like she might own more of this stuff. She has a slightly seductive aura…

For today, I’ll just buy these short pants. Satisfied with obtaining the ultra-rare item of Reina-san in loungewear, I thanked my sixth sense and lined up at the register.

After leaving the store and heading to the shopping mall, I still had thirty minutes until the meeting time. Since some of my friends are chronic latecomers, there was no need to wait obediently. While walking through the crowded mall on the last day of the long weekend, I spotted a particularly eye-catching store.

It was a skincare brand with lots of colorful soaps on display. Maybe because of a sale, many beautiful older women were going in and out.

I suddenly remembered Sis’s slightly rough fingertips. …Maybe I’ll go in.

The store was filled with a mix of various scents, and the sheer variety of products made my head spin.

“Are you looking for something?”

“Ah, um… do you have hand cream?”

“We have some right here. This is our new product————”

This is more expensive than the short pants! I thought in shock, but I sniffed the sample they handed me. It had a nice citrus scent, but I didn’t want it to overpower Sis’s natural smell…

“——and this one is on sale and cheaper.”

A vanilla mixed with something scent. This one’s good. It’s still a bit expensive though.

“If you buy two, you’ll get an additional 15% off.”

Extra discount… That’s right. Reina-san gave me so much advice. It wouldn’t hurt to get her a thank-you gift. She’s often at the sink too, so this would be perfect.

“I’ll take these two then.”

“Thank you very much. Would you like anything else? …Then please line up over here.”

What a skilled saleswoman. I almost ended up buying things I didn’t need. I quickly got in line.

The register line was full of beautiful women. As expected, a lone guy stood out. Some people openly stared at me. But this was nothing. After the time I lined up with just women’s short pants, this stage was easy to clear. If anything, I stared right back — purely for reference on Sis’s new fashion. No perverted meaning.

After paying, I got a message from my friends saying they had arrived. While I was looking at the floor map to find a locker, a voice called out from behind me.

“Um…”

“Eh, yes…?”

Oh no… It was the beautiful woman who had been in front of me earlier. But since she stared at me first, I just returned the favor.

“Um… that… I bought the same one… It smells really nice, right…?”

“Haa… yeah, it does.”

I thought she was going to complain, but her unexpected comment left me with only a dazed reply. This is suspicious. It’s getting kind of scary.

“Sorry for suddenly talking to you! …Um, are you looking for something?”

I hadn’t noticed because of her mature outfit, but she had a cute face. She might even be a high school student. I felt a bit relieved.

“Ah, yeah. I’m looking for a coin locker.”

“It’s this way. I was going to use one too.”

“Thanks——”

Before I could finish, she started walking. Surprised by her assertiveness, I followed her. Is this just kindness? Does she have an ulterior motive? Is she trying to pick me up…?

While thinking suspiciously, I looked at her from behind. She was shorter than Sis but much taller than Shiori — around 160 cm maybe. Still, I couldn’t tell her age at all.

After walking while making various guesses, we reached a relatively empty coin locker area.

“Thank you.”

“No problem at all. Um… if it’s okay, could I have your contact info?”

…It was a pick-up attempt after all.

I was momentarily confused since it was my first time, but a wombat started dancing in my head.

“Sure… here.”

“Thank you!”

She scanned my QR code and smiled happily.

“Um! I’ll message you later! I’m here with my mom right now, so thank you!”

“Eh… ah, yeah.”

She ran off, her short skirt fluttering. I stood there alone.

“With her mom…”