While Taking Care of My Shut-In Little Sister, I Somehow Ended Up Ejaculating Inside a Beautiful Girl - Chapter 72: Light and Shadow

Chapter 72: Light and Shadow

“Why… is there a light… in Ren-chan’s room!?”

“…”

…Indeed.

The light reaching Yuu’s room from next door.

Yuu’s quick realization that it was coming from my room was uncanny, but it was undeniably the light leaking from my room.

My room in the Hoshimiya household is close enough to Yuu’s balcony that you could jump to it.

Of course, with the house locked up tight, no one could enter my room through the window, but it’s that close.

The light from my room was visible through both our curtains. Privacy is already a lost cause, but maybe I should be glad we noticed this abnormality.

“…”

Whatever it is, if I can check it out, I should.

“Sorry, just a sec.”

“Huh?”

Naked on the bed, I crawled out carefully to avoid stepping on the equally naked Yuu.

“Wait, where… are you… going…?”

Yuu’s voice trembled with alarm as she hurriedly got out of bed and came to me, now wearing my half-pants.

Her fingers slipped between the elastic of my pants and my skin, her anxious gaze fixed on me. That’s an odd way to stop me—effective, but ticklish, so I wish she’d stop.

“Ren-chan…?”

“Just gonna take a look.”

“Really…?”

“Yeah.”

Standing before me, looking up, she was still naked, of course.

Her bowl-shaped breasts, neither too big nor too small, perfectly proportioned.

Her cherry-colored nipples peeked through her disheveled, glossy black hair.

Her lower region, with faint hair starting to grow, was visible in the dim room, creating an intensely erotic scene.

To keep my son from waking up again, I averted my eyes and looked at the curtains letting the light through.

“All possibilities are slim, but… it could be my sister, my parents, or an intruder. Whatever it is, I need to check.”

“No, don’t go… It’s dangerous. Let’s stay here tonight. You can check later, right…?”

“…”

Needless to say, my paranoia stems from my shut-in sister in the back room on the second floor. If it’s an unexpected intruder, I can’t guarantee her safety right now.

The possibilities I mentioned are all unlikely, yet my room’s light is on. It’s not like the ceiling light turned on by itself or some random coincidence.

“I’ll step back a bit. Let me take a look from here first.”

“Uh… okay…”

Gently brushing off Yuu’s protests, I approached her room’s window.

I peered through a gap in the curtains at my room’s window nearby.

“…No good, huh.”

As expected. Even with the light leaking through the closed curtains, I couldn’t see any details inside.

“You’re going?”

“Yeah.”

“…”

Turning around, I saw Yuu had changed into a casual shirt and skirt (if you can call it that) at lightning speed. Following her lead, I pulled a shirt over my still-naked upper body.

“Stay here.”

“No way…!”

“Please.”

“I’ll check with you!”

“Yuu.”

“But…!”

She was a bit frantic, so I tried to calm her.

“If something happens, it’s better if you stay here. Hold on… I’ll call you from my phone…”

I grabbed my phone from her desk and called her registered number.

“…Hello?”

To keep her voice from being heard, I turned the speaker volume to the minimum.

“…Good, can’t hear you. Keep the phone connected like this. If you think something’s wrong, call the police.”

“…………………………Okay.”

Smart as she is, Yuu reluctantly nodded, understanding my intent.

“Don’t leave the house, no matter what. If something happens, it’s too late. Worst case, I can handle myself, but if something unexpected happens, you call the police.”

“…………………………You’re really going?”

“Yeah. I have to check.”

“………………………………………………………”

And, as I mentioned, it could be my parents.

Though it’s unlikely they’d come home unannounced like this…

Speaking of messages, my phone’s app showed an insane number of unread notifications.

I glanced at it this afternoon, but Yakko Tsukimi kept spamming me, apparently. A quick check now confirmed, as expected, nothing urgent.

“Phew…”

I rolled my shoulders, hopped lightly to get my blood flowing. Not exactly battle-ready, but I prepped my body to move instantly if needed.

“Alright.”

“…”

Yuu followed me silently as I headed to the Onodera house’s entrance.

*

“Lock the door as soon as I leave.”

“…Okay…”

As I stepped out of the Onodera house, I saw Yuu’s face in the darkness beyond the closing door.

Expressionless but somehow worried… I don’t think it was my imagination.

Hearing the soft click of the door lock, I left and headed to the Hoshimiya house next door.

I began my quiet infiltration.

…It feels bizarre sneaking into my own home like this.

“…”

I was extra careful unlocking the front door.

As expected, the first floor was pitch black.

The locked entrance and dark first floor ruled out my parents’ return.

That left a wandering household member or an unexpected intruder, but what’s the right move in this situation?

If it’s an intruder, the absolute priority is preventing them from encountering my sister.

Running into the intruder myself would be ideal…

The worst-case scenario would be an intruder, startled by my return, wandering around and bumping into my sister if she steps out of her room.

I have to move stealthily, like an intruder myself, to solve the mystery of the light.

Any noticeable action that alerts the intruder or my sister would be game over.

“…”

I stepped over the entrance threshold with my shoes on. Tracking footprints wasn’t an option now. For now, I’d assume whoever entered my room was still there.

I slowed my breathing, sometimes holding my breath entirely, taking utmost care to mask my presence.

“Presence” isn’t some mystical sixth sense. It’s mostly air movement, sounds, temperature, or humidity changes caused by an object’s presence, entry, exit, or repositioning. To kill my presence, I minimized those factors—quiet breathing, silent footsteps, reducing air resistance while moving. I did everything I could while advancing through the first-floor hallway.

“…”

First, a quick check of the first floor for clues before heading to my room.

No broken windows or glass…

Window locks were secure. If it’s an intruder, I couldn’t assume a forceful entry.

“…”

I climbed the stairs.

Wooden stairs creak even with temperature or humidity changes. The first step made a slight squeak just as my foot touched it, but I controlled my weight distribution and ascended silently after that.

—And my room.

It was right at the top of the stairs.

The doorknob was right in front of me.

“…”

I grabbed the knob and pulled without hesitation.

For a moment.

The room’s light was blinding. My eyes, accustomed to the dark, stung briefly but adjusted quickly.

Crouching low, I slipped into the room, scanning my surroundings in what felt like slow motion—

“…Huh?”

My vision snapped back to normal.

Because—

“No… one’s here…?”

Yes.

A quick search confirmed no one was hiding under the bed or in the closet.

Truly, no one was here.

My brightly lit room.

As if waiting for my return, the light was on, shining for no reason at all.

“Huh…?”

I was completely thrown off.

I’d checked the first floor briefly… Could an intruder have read my timing so perfectly that they hid somewhere downstairs…?

I wanted to turn back, but wait—calm down. That’s impossible. No random intruder could predict my movements from next door in that situation.

But if this intruder was after valuables, you’d expect the house to be visibly ransacked… There’s no sign of that downstairs or in my room.

…It doesn’t add up.

I can’t figure out their motive.

“What’s going on…?”

Cold sweat trickled down my back. This situation was baffling and downright eerie.

Trying not to tense up too much, I stayed as calm as possible and muttered to myself, knowing Yuu was likely listening through my phone’s open call, to update her on the situation.

“I checked the first floor briefly, but there’s no trace of an intruder… My room’s light is still on, but there’s no sign of anything disturbed downstairs or here—”

And at the end of that explanation, I saw something unbelievable in my room.

“—!?”

I rushed to my study desk.

In front of my PC monitor, on the keyboard.

As if screaming, “You’ll definitely notice me here,” an object was deliberately placed, loud in its presence.

“What… is this… a photo…!?”

…It was a wooden photo frame, the kind used to display pictures.

With a foldable stand at the back, a common, unremarkable photo frame.

But there was one problem—

Seeing the photo inside the frame, I felt like words were ripped from my mind.

“This…”

Not the frame itself, but what was inside.

The photo.

The photo in the frame showed…

Long silver hair flowing like the Milky Way, shimmering brightly.

Pale, gem-like emerald eyes, nestled in soft cotton.

Skin so white it seemed to draw you in.

A mysterious beauty with an impassive expression, softened by a gentle smile, gazing at me.

She looked like a princess from another world or a meticulously crafted doll mimicking a human.

Yet, proof she wasn’t a doll—she had grown from the childish image in my memory, maturing into a beautiful girl my age, her appearance now distinctly that of a young woman.

Her developing body was clad in a thin shirt and shorts, striking a cute pose with a bent-finger peace sign, mismatched with her ethereal beauty.

A slightly embarrassed selfie, likely taken against her room’s wall.

Her expression showed confidence in her beauty, yet a hint of shyness about revealing her body.

A bewitching smile.

A bashful pose.

Together, they created an indescribable, alluring aura.

The girl in the photo.

She was none other than…

“Shio…ri…?”

Shiori Hoshimiya.

My sister, who should be holed up in her room in this house.