While Taking Care of My Shut-In Little Sister, I Somehow Ended Up Ejaculating Inside a Beautiful Girl - Chapter 31: The Secret She Didn’t Know / Sunday’s Secret (?) Outing

Chapter 31: The Secret She Didn’t Know / Sunday’s Secret (?) Outing

I’m cleaning my room right now.

“Ren-chan ♥ Ren-chan ♥ Ufufufu~ ♥.”

On the bed, my beautiful childhood friend, Yuu Onodera, lies completely naked, her thighs stained with milky white, wearing a beaming smile in her shameless state.

Her long, glossy black hair clings to her neck and her perfectly shaped, bowl-like breasts, accentuating their cherry-pink tips, adding a sensual charm to her body.

Meanwhile, her exposed crotch is completely bare—her faint pubic hair, her slit, and the remnants of love juices and semen around it, all fully visible.

“Ren-chaaan ♥ Look over here~ ♥.”

“Nope.”

“Look~ ♥ The semen’s almost all dripped out~ ♥.”

“Not looking.”

“Look~ ♥♥♥ Open and close~ ♥♥♥.”

“Stop it.”

We went at it like crazy last night, but Yuu’s still tempting me.

I thought my libido had calmed down, but my body’s been acting weird since last night, getting hard at the slightest thing.

Considering I’ve been borderline ED lately, this recovery is almost miraculous—but maybe a bit too much…

Anyway, Yuu, still seducing me from the bed, is way too erotic. I’ve got to avoid looking at her, absolutely avoid it, and focus on cleaning. Otherwise, we’ll end up tangled together until nightfall.

I’m pretty sure last night, since it was our first time having sex, we agreed, “No more tonight. We’ll do it properly tomorrow.” But…

Thanks to my runaway lust, I broke that promise—or rather, jumped the gun—and we went at it all night.

I’m the one who made the promise and broke it, such a pathetic outcome… I kept saying I wanted to “cherish” her, and now look at this mess… Guilt, self-loathing, and shame for my lack of self-control overwhelm me right now.

Cleaning alone is my self-imposed punishment.

“Ren-chaaan ♥.”

“Yeah, yeah. Seriously, though… you’re really okay, right?”

“Totally fine~ ♥ You broke my hymen so gently, and you were so careful with me afterward ♥. Thanks to your kindness, I had the perfect first time ♥.”

“Well… that’s good to hear.”

I’m relieved by her words, not out of concern but pure joy.

While avoiding her gaze, I start thinking about the bed she’s lying on.

It’s damp from our sweat and other… bodily fluids.

The sheets need to be washed or thrown out, no question. Even the mattress underneath might be stained—it’s looking pretty suspect.

If I leave it, my bed’s gonna become a hygiene disaster, so I decide to tackle it after cleaning the floor.

“Ahh~ ♥ I’m wrapped in Ren-chan’s scent~ ♥ Like you’re enveloping my whole body~ ♥ Like you’ve marked me all over~ ♥.”

Yuu’s putting on some kind of one-woman show, but I wish she’d stay quiet. My “little guy” down there could go wild at any moment.

But thanks to my struggling rationality, I’m nearly done cleaning when—

“—Whoops.”

I accidentally knock over Yuu’s suitcase near the closet.

Thud, rustle, clatter.

“Crap, sorry, Yuu—”

I reflexively turn to apologize, but she’s…

“Ehehehe~ ♥.”

…grinning sloppily, clutching my pillow to her chest, rolling around on my bed.

She didn’t notice… Well, I’ll just clean it up quick.

I reach for the scattered contents of her suitcase.

It’s mostly her clothes. Bulky stuff like a cute pouch with cosmetics, a plastic case that probably held her toothbrush set (her toothbrush and cup were already taking over a corner of the bathroom last night), just normal things—

“…Huh?”

I spot a black zip-lock bag.

It’s about 35 cm tall and 25 cm wide, roughly A4 size.

And there’s something inside.

“…”

Sanitary pads, maybe? I might’ve stumbled on something awkward. Even on the pill, periods don’t stop, right?

“…But…”

It feels thin. Really thin.

When I put it back in the suitcase, the sensation through my hand was like a single folded cloth.

I’ve seen sanitary pads before—used or unused, they don’t get this thin.

And it feels oddly… familiar. The texture, the touch—

“…”

Wait, it’s through plastic. Why would I think it’s familiar?

I’m overthinking it.

Besides, it’s Yuu’s, and if she’s hiding it in a black bag instead of a clear one, it’s something she doesn’t want me to know about. Prying would be rude.

I quickly put all her stuff back in the suitcase.

*

“All done.”

After cleaning, showering, and changing, it’s already 3 p.m.

Yuu offered to make snacks—a rare treat in our house—but I politely declined.

I’ve got something to do.

That means she has to start getting ready to leave.

Our sleepover date was just for the weekend, and today’s Sunday. Tomorrow’s a school day.

“You’re going out…?”

“Yeah.”

As I slip on a light coat to head out, Yuu, standing at the entrance with her suitcase, asks with a hint of loneliness.

“…You go out every Sunday, don’t you?”

“Pretty much.”

After a long pause, she speaks with a tinge of resentment, almost like a grudge.

“W… Where are you going…?”

Her hesitant question comes with deep, dark eyes glinting faintly in the daylight.

Her gaze pierces me.

“Wanna know?”

“…Yeah.”

She nods, dead serious.

I’ve never told anyone where I go.

Before leaving, I triple-check every window and door, locking the house tight.

Normally, a one-hour train ride takes me ninety minutes, sometimes two hours, because I take the long way.

Extra cautious, you could say.

Why so careful? Well… lots of reasons.

The place I go almost every Sunday afternoon—even Yuu doesn’t know about it.

“But it’s a place you really want to keep secret, right? You’ve never even told me…”

She pouts, eyes downcast, looking sad, with a hint of distrust. “You’re too thorough…”

Seeing her like that, I decide to share my secret.

“Yuu, do you have any secrets you’re keeping from me?”

“Me? No, I don’t have any secrets from you—n-none at all…”

Her eyes dart mid-sentence. She’s got something hidden, and she’s not ready to tell me.

Well, everyone’s got one or two secrets they keep to themselves.

“Hey, Yuu.”

“…What?”

It’s the end of our big date, and we’re parting with this kind of talk? Her mood’s clearly down, but her honesty is cute.

“I’m heading out like usual.”

“…Yeah. You’re gonna tell me not to follow you, right?”

In the past, when she tried following me everywhere, I had to tell her to stop.

“Nah, I’m not saying that this time.”

“…Huh?”

“Wanna come with me?”

“…What!? Really!?”

“If you’re okay with it. We’ll be back late, though.”

“Y-Yeah, I’m in! I’ll go!!”

“Alright.”

“I’m coming with you!!! Take me!!!”

“Got it, got it. Then drop off your stuff.”

“Okay!!!”

No sooner said than done, Yuu slips on her shoes at the entrance with lightning speed and zips back to her house like a bullet.

I step out, lock the door, and wait. She’s back in no time.

Earlier, she was wearing a white blouse and black chinos, but now she’s added a beige, stole-like cardigan. The brown shoulder bag is the same one from yesterday’s date.

Her hair, like the latter half of yesterday, isn’t in her usual pigtails. Her long, glossy black hair flows straight, giving her a mature, striking look that catches me off guard.

She strides up beside me, brimming with enthusiasm, and naturally links arms with me as we start walking.

“Did you tell your mom?”

“Yup. I said I’m going out with you, and she said to go ahead. Just to let her know if I’m back after midnight.”

“That’s fine then.”

“…If it’s gonna be late, what about your sister’s dinner? I could make something for her…”

Yuu brings it up hesitantly. She doesn’t know where we’re going, so it’s no surprise she’s cautious. It’s sweet of her to offer, but she doesn’t need to worry so much.

“Thanks for the thought, but it’s like this every week, so it’s fine. My sister manages to eat on her own.”

“Right… yeah.”

Usually, I make homemade meals for my sister.

The main reason is to control her nutrition, and the second is that homemade food just feels better—but that’s beside the point right now.

If I don’t cook, she might skip eating, or when I’m asleep or out, she’ll scrounge something up herself.

Plus, last night, she ate every bite of Yuu’s hearty, nutritious homemade meal.

So—if she got that kind of treat—I’m starting to think it’s okay to leave her for a bit, as long as I lock up tight.

Since officially getting together with Yuu, my mindset’s starting to shift.

It’s strange.

“For now, don’t worry about my sister.”

“Okay, but…”

Yuu glances around, her eyes darting, subtly on guard.

I’m enjoying the feel of her perfect, bowl-shaped breasts against my arm—even through her bra, the soft sensation peeks through, and it’s pretty great—wait, no. My thoughts wandered.

“Something wrong?”

“N-No, it’s just… yesterday, Tsuki-chan…”

“Oh…”

I get what she’s hinting at.

“Hey, Ren-chan. Tsuki-chan’s totally a stalker, right? I kinda suspected it before, but… she’s kinda scary… weird…”

“…”

Yuu keeps calling Usotsuki-chan “weird,” clinging tightly to my arm, seemingly without a shred of doubt in her words.

“Usotsuki-chan being weird isn’t exactly news, is it?”

“So you knew about that too!?”

“Not exactly. But we’ve known for a while she does impulsive stuff when she’s unstable, right?”

“This time it’s too much…”

“Well… yeah.”

She did climb on top of me in her underwear, choke me, and nearly kill me—physically and socially.

“You’re… okay with that?”

“With what?”

“I mean…”

“I’m fine.”

“…”

Yuu looks up at me, eyes glistening with concern.

She’s so kind.

“Don’t push yourself, okay?”

“I’m not.”

…Wait, yeah.

Maybe I’m acting too calm, and that’s making her anxious.

We pass through the station gate and board the train.

“Oh, we’re getting on a train right away…”

“Well, it’s faster.”

We hop on the train as it arrives on schedule, letting it carry us to our stop.

Inside, the train has rows of seats facing forward, two by two, like a bus.

Sitting next to Yuu, I start explaining where we’re headed.

“—Your aunt…? Huh? What’s that mean?”

As soon as I start, Yuu’s eyes widen in shock.

“Exactly what I said. The person I’ve been meeting every Sunday is your aunt—your mom, Kiyomi Onodera’s, older sister.”

“—Wait, hold on… I can’t keep up…”

“No surprise there. It’s probably a shock.”

She’d never dream her boyfriend was regularly meeting her aunt.

“Yeah, I mean… even at New Year’s, when we visited your house, she didn’t show up or say hi.”

“Of course not. Masami—Masami Narita—is your relative, not mine.”

“That’s true, but…”

She’s not fully convinced but starting to accept it.

“Then why keep it a secret from me?”

“It wasn’t a secret.”

“Liar! You never told me, and you said I couldn’t follow you!”

“It wasn’t about keeping it a secret. I just didn’t want anyone seeing me meet your aunt—”

“That’s what a secret is!!”

“O-Okay, my bad for making it seem that way. Also, your voice is loud.”

“—!”

I shush her, and she quiets down for now.

“So what’s the deal!? Meeting my aunt in secret… what’s that about!?”

“Not a ‘secret meeting.’ Nothing shady’s going on.”

“Then…?”

She’s freaking out more than I expected, so I try to calm her down.

“Anyone else…?”

She mutters another question.

“Nope, just her.”

“So you were meeting a woman alone!?”

“Well… yeah…”

“That’s cheating…!”

“Calm down.”

Even sitting on the train, she doesn’t let go of my arm, leaning closer with a desperate look, her teary eyes making my heart twinge with guilt.

There’s really nothing going on…

My meetings with her aunt started before Yuu and I became fake lovers or anything. It’s not cheating, and neither I nor her aunt have any feelings like that. Factually, truly, in every way, I can say that with certainty.

“No… No, no, no, no…! Ren-chan… cheating… I don’t want that…!”

“I’m telling you, it’s not like that.”

This is going nowhere. I need to explain more.

“I was meeting your aunt because, well, I was working for her.”

“Working…!?”

“Yeah.”

“Like… a shady job serving adult women…!?”

“No way.”

I’m stunned by how far her imagination’s running. It’s kind of funny, but I deny it firmly.

That kind of work might pay, but the risks are too high—getting caught, sacrificing too much.

“There’s nothing like what you’re thinking. I help with her work, and she pays me. That’s it, plain and simple.”

“…Really…?”

“Really. I swear.”

“You swear on your future wife?”

“Hmm… huh?”

Wife?

“Well… I swear to God…?”

“You’re an atheist! That’s a lie then!”

“What do I swear on then!?”

“Your wife! You don’t believe in God, so swearing to God’s a lie, but your wife exists!”

“I don’t even have a wife right now.”

“Just swear to me! Then I’ll believe it’s not a lie!”

“What kind of logic is that…?”

“Come on, Ren-chan! Swear or not!? Will you or won’t you!?”

“…”

If it makes Yuu feel better, fine…

“Swear or not!? Or can’t you swear!?”

“I swear. It’s the truth.”

“—!”

Yuu seems to flinch for a moment.

“Say it in my ear! Swear it!”

“Another weird demand…”

Fine, if it’ll make her happy. Might as well go all in.

“There’s nothing going on with me and your aunt. I swear to you, Yuu.”

“~~~!? ♥”

I whisper it in her ear, and she shudders, pulling my arm closer.

This girl… she’s pretty sly, huh.

She always manages to get her way in the end.

“Okay ♥ I believe you, Ren-chan ♥.”

“Glad you do…”

I kinda saw this coming, but keeping my real reasons for secrecy from her is turning into more trouble than I expected.

“~~♪♥.”

Yuu clings to my arm happily, and I give a wry smile, gazing at the rural scenery passing by the train window.

*

“Wow, we really got here in an hour…”

“Yup.”

We’re standing in front of a massive ten-story building, quietly nestled in the middle of the mountains.

It’s a residential building, but the surrounding structures—research facilities, factories, or maybe apartments—are just as impressive, though most are only about four stories tall, sprawling wide.

“Such a shady place… That’s why you hid it?”

“You’ll see soon enough.”

I nudge Yuu along, and we enter the building’s entrance.

“Wow…”

Yuu’s speechless, awestruck, but I head to the reception desk to check in. The receptionist lady greets me, “Hey, Ren-kun, doing okay?” and I reply casually.

“…”

“Yuu, don’t glare like that.”

“You’re such a flirt, Ren-chan.”

“What? That’s ridiculous. It was just a greeting.”

Her jealousy over a simple chat with the receptionist reminds me how intense her possessiveness is.

It’s kinda flattering but also a bit scary.

“The boss is awake,” the receptionist says.

“Got it. Thanks.”

We get the go-ahead, and I thank her before heading to the elevator with Yuu, aiming for the top floor.

In the elevator, as Yuu catches her breath, I check in with her.

“How much do you know about your aunt’s job?”

“Just that she’s, like, a company president… I always thought she was cool when she visited, but… she’s really something, huh?”

“Yeah.”

She’ll find out who her aunt really is soon enough by meeting her.

*

When we open the lacquered wooden double doors—

“—Ugh!”

Yuu lets out a choked gasp.

No surprise there.

This isn’t some pristine president’s office on the top floor of a high-rise, with huge windows and a stunning view.

“Masami-san, how do you make such a mess again…?”

With a sigh, I step into the trash heap of a room.

The air’s damp and clammy. It smells of garbage mixed with alcohol—booze, really.

Even though it’s almost evening, the curtains are drawn, letting in just enough light to make the room dimly gloomy. Left like this, mold’s probably not far off.

I kick aside the scattered trash to make a path, and we move deeper into the president’s office.

I’m so used to this chaos that I’m not shocked anymore, just exasperated. I pick up empty bento boxes in small plastic bags, stuffing them into the 45-liter trash bag I brought. There’s a ton of liquor bottles too, but I start with the bigger, lighter stuff.

“W… What’s going on…?”

Yuu stands frozen, too stunned to even help.

I can’t blame her for being freaked out.

This mess, caused by one woman’s lifestyle, in what’s supposed to be a company president’s office, is nothing short of a crisis.

It’s like a certain fairy—no, a drunken sprite—has taken up residence.

“Masami-san, wake up. We’re cleaning, so move to the next room.”

“…Nngh~? Ugh… oh… Ren, huh… Right, I heard something on the intercom…”

When I call out, a pile of trash shifts and rises.

Rustle, thud, clatter. A woman shoves aside plastic bags and empty cans, sitting up.

“Auntie!?” Yuu gasps, eyes wide.

I hold out a hand, and the woman scratches her head roughly.

Her messy ponytail, with its frayed hair, gets flicked aside as she scratches until she’s satisfied.

“Auntie!? Y-You’re… naked!?”

“Masami-san, put some clothes on.”

“Ngh…?”

She’s practically naked, just a black bra and panties.

Full breasts, slim waist, nicely rounded hips—an almost enchanting figure with smooth skin. But her room, her behavior, everything about her is just… tragic. A classic tragic beauty, Masami Narita, Yuu’s mother Kiyomi’s older sister, Yuu’s aunt.

And she…

“Yaaawn… Ugh, my eyes won’t open… Oi, Ren, grab me some booze to wake me up.”

She lets out a huge yawn and makes a ridiculous demand.

“What is this!? No way, this isn’t the aunt I know!?”

Yuu’s intense shock is totally understandable.