Don’t underestimate your sister’s love, you know?

“Huff… huff…”

Dragging his feet, he returned home looking as if he had just traversed a battlefield with bullets flying all around.

Since then, he had been dodging advances from the newly ignited lolicon spirit within Natsume. 

It was quite a struggle to avoid her.

“(It’s going to be tough at work…)”

Even though he had started his part-time job as a means of escape, it seemed ironic that he would encounter such difficulties even in this refuge. 

It was truly a case of things going from bad to worse.

However, now that he had been hired, he felt reluctant to just quit the job.

Climbing the stairs with a sigh, he entered his room, feeling cornered from all sides.

“Sigh… I’m tired.”

Without turning on the lights, he flopped onto the bed, still wearing his uniform. 

Since there was still time before dinner, he considered taking a short nap when suddenly he heard a voice.

“…Nii-san”

“Wha-wha the!?”

The lights suddenly turned on, and he jumped up in surprise to find Yukine standing there.

“W-What’s up, Yukine?”

“Welcome home, Nii-san.”

“Ye-yeah…”

Normally, she would jump into his arms, but today she seemed unusually subdued.

“Where were you today, Nii-san?”

“Well, uh, you know… just around?”

“Just around? Could it be… a date?”

“No-no, nothing like that! Just… you know…”

He hesitated for a moment, debating whether to tell her the truth, but realizing she would find out eventually, he decided to tell her anyway.

“I went for a job interview. I was thinking of getting a part-time job.”

“Oh, a part-time job… I see. Well, that’s good then.”

“Yea-yeh…”

Yukine blushed slightly and smiled happily, which surprised him as her reaction was different from what he expected.

Seeing Yukine’s calm demeanor, he relaxed completely and sat on the edge of the bed, stretching out his legs.

“Where are you working?”

“At the bookstore, the one near the station.”

“Oh, so you’re working at a bookstore.”

“What’s that supposed to mean? Surprised?”

“No, not really. You’ve always liked manga, so it’s not surprising at all… But you usually buy them digitally, don’t you?”

“Oi those are Ero Mangas though!? Wait how do you know that!?”

“…A little sister knows everything about her big brother, you know?”

“Give me a break!”

Fufu, Yukine chuckled softly and sat down next to him.

“But, Nii-san is working… means we’ll have less time together, and I’ll miss–“

Yukine suddenly froze.

“He-hey, Yukine? What’s wrong?”

Yukine started sniffing at his clothes in silence.

“Wha-what is it Yukine? It’s ticklish?”

“……..Nii-san.”

“Wha-what?”

“…You met a girl, didn’t you?”

“…”

He stiffened, avoiding Yukine’s cold gaze.

Don’t make eye contact. Instinct warned him of danger.

“Nii-san, you said it wasn’t a date, right?”

“Well, um… yeah, it wasn’t a date.”

“You said it was a job interview, right?”

“That’s correct, it was a job interview okay? But the interviewer was a girl, so…”

“A girl?”

“Well…..yes”

Yukine sighed heavily.

“Nii-san, didn’t I tell you? You’re not allowed to get involved with any other girls except me.”

“Isn’t that a bit difficult to manage in life?”

“Do your best?”

“Even if you say that with puppy eyes, it’s still impossible!”

“…I understand. You can get involved. But why are you so close to a girl to the point where your clothes smell like her? It’s weird, right? It was just a job interview.”

Gulp

At this point, being approached by Natsume had become a liability. 

He couldn’t possibly tell her about being asked to make a child.

“It was just by chance, just-by-chance! Probably because it was a small room, that’s why it happened.”

“But that’s no good, right? That’s no good, is it?”

“Um, what?”

“While having a little sister like me, that’s not good, right? It’s cheating, isn’t it? Infidelity, isn’t it!?”

“But that’s not what it is at all!”

Yukine surged forward as if driven by impulse.

“You’re terrible Nii-san! You mess me up like this and then get close to other girls! Yo-you…pervert!”

“That’s the last thing I want to hear from my little sister!? Besides, those words aren’t something a cute girl like Yukine should use!”

“C-Cute!? …Ehehe, Nii-san, Nii-shaan…Ah! You cheater!”

“What’s with you!?”

“I’ve had enough!”

Yukine pushed me down onto the bed and straddled me.

“Yu-Yukine!?”

“Nii-san BAKA! Stupid stupid stupid! Idiot sister!”

“Is the last one a good for Yukine?!”

“Shut up! I’m not going to forgive you anymore!”

“Ugh!?”

Yukine clung tightly onto me.

“Nnnnnnnnnnnn!!!”

“Whoa!!”

Yukine pressed her cheek against my face, rubbing her scent on me, and wrapped her arms around my back.

Our bodies pressed close together, enveloped in Yukine’s soft body and sweet smell.

“Y-Yukine! Anymore than this, and I won’t be your brother anymore!!!”

This is bad, extremely bad!

I can’t say what it is but it’s extremely bad!

“I won’t stop! We’re going to become one with each other Nii-san!!!”

“Stop itttttttttt!!!!”

My body heated up.

Conflicting thoughts boiled in my mind.

A battle between myself, who wants to be a big brother, and an adolescent boy, who is a s**ual monster.

“Stop, Kouta! You’re her brother, aren’t you? If you reach out for those soft breasts now, you’ll be dead!”

“What are you saying! Yukine loves Kouta, and Kouta loves Yukine! It’s mutual love! So let yourself be consumed by desire!”

“We can’t do that! We’ve only just become family! If we engage in impure deeds now…”

“Just be with Yukine! Even if we’re siblings, it’s only by law! Go on! Squeeze them! Embrace me with all your might!!!”

“No, no, no, no, no, no, no, no, no!!!”

“Yes, yes, yes, yes, yes, yes, yes, yes, yes!!!”

…………..

…………..

……tap tap. (footsteps)

“N-no more….”

“Nii-san~~~~~~♡”

Exhausted, I gave up as Yukine continued to cuddle me relentlessly.

[Extra]

Thirty minutes later, Kouta, utterly drained, laid on the bed.

“(…All I can smell is Yukine’s scent…)”

Kouta had been successfully marked.

――――Afterword――――

Thank you for reading this far!

Although it’s unrelated to this story, I’d like to promote my new work!

The title is “I, Who Got My Childhood Friend Stolen and Was Hated by the Whole School, But For Some Reason, the Beautiful Transfer Student Who’s a Total Pervert, Wants To Dedicate Her Body and Soul Me and Volunteers To Be My Slave”

This work also features uniquely intense characters, so please check it out!