"Hoo...!"

The temperature has clearly dropped compared to earlier. From time to time, I couldn't help but exhale hot air into my palms and then open the curtain slightly to continue observing Yukari's room.

Just as I lifted the cover off the candle to look, it happened to be extinguished by her. Is she finally going to rest?

I glanced at the time on my phone. It was almost half past nine at night, quite early for sleep. After all, young people in their teens have abundant energy.

Lying in bed, I gradually calmed down and thought to myself.

Yukari is not only beautiful, but unexpectedly intelligent as well. Last time, just because of holding hands, she became the enemy of the people...

"Ah, she really is an outstanding sister that makes people unable to look directly at her."

Hiding in the quilt, I buried my head deeply in the bedding, feeling a bit disorganized in my mind.

"If I could have a romantic relationship, wouldn't it be great if it were with my sister?"

I started to feel a bit complacent and even began daydreaming and talking to myself.

If she were my sister... Oh dear, I couldn't believe that I developed a crush on my own sister. How twisted!

I shook my head vigorously, feeling entangled in both my heart and reality.

"Huh, it seems that Yukari and I don't have any blood relationship at all."

According to the law, it seems that we could get married... Married!!

Marriage, such a sensitive word, just thinking about it makes me blush.

But when I looked at reality, I remembered that life is never smooth sailing. How could the male protagonist's reversal, which often occurs in hot dramas, happen now?

So, feeling a bit discouraged, I rubbed my sleepy eyes.

"I guess there is no future between Yukari and me."

Ten years later...

Outside Factory No. 356 of a certain factory, a pitiful man repeatedly performed various simple and laborious tasks at the workbench of the assembly line.

"Hoo, I heard Yukari is coming to see where I work today. I must..."

Suddenly, a long luxurious black car stopped abruptly in front of the factory gate, as if thundering by.

As the car door opened, an initially dolled-up woman in a mink coat came out. The high-end brown sun hat with several gold threads on it was enough to indicate its high price. The extremely bright and expensive lipstick on her lips made her look like a magnificent lady!

"Yukari?!"

"Oh, is this the madam's younger brother?"

A well-dressed man (face unknown) walked up to her, embracing her fragrant shoulder and posing a very affectionate manner.

"Uh, Yukari, who is this...?"

"Yes, Juxi, I haven't introduced you two yet. This wealthy, handsome, and considerate man is my husband..."

Yukari's husband... Husband...

I simply couldn't imagine any further!!

But the coworkers around me, dressed in the same blue overalls, came over to congratulate me.

"Haha, Juxi's sister turned out to be so wealthy and influential. You must take care of us brothers from now on!"

"I... It's not, not like that!!!"

My face turned black and purple, and I thought to myself, this is simply a nightmare!

Only after I recovered did I realize that I was still lying in bed at home, drenched in cold sweat, breathing heavily.

It turned out to be just a nightmare, but now I was shivering from the cold.

"Huff...ahh..."

Drenched in sweat, I frantically searched for something to wipe the sweat off my forehead. Ah, is this fabric?

Regardless, I picked it up and wiped it on my forehead, only to jostle something heavy.

"That was terrifying. I hope that kind of future never comes true!"

"What kind of future are you talking about?"

Yukari's voice suddenly appeared in front of me. It was then that I realized something was off, so I looked at the piece of fabric I held up.

A pair of eyes, shimmering with a deep orchid color in the darkness, stared at me from a distance of just one hand's width from my face.

"I mean, how long are you going to cling to my nightgown?"

"Huh? Nightgown..."

Gradually getting used to the darkness, I realized that what I was clutching in my hand wasn't a towel or a blanket. It was Yukari's nightgown!

In my daze, Yukari had somehow crawled into my bed without me noticing.

In a panic, I quickly smoothed out Yukari's nightgown for her, but accidentally pressed too hard, causing my whole palm to touch her stomach. A kind of indescribable softness immediately electrified my body!

"You idiot, get away! It's freezing!"

Yukari grabbed my wrist and flung it away.

"Ah...s...sorry!"

I felt like I was losing my sanity. Even a strong-willed woman like Yukari could have a cute side.

But my sense of humanity reminded me to hold her accountable in advance!

"Wait a minute, how did you end up in my room? Don't you have your own room?!"

"Oh, well, I'm just being possessive. If you've gone into my room, naturally I want to spend some time in yours."

"What? Don't joke around. Quickly...what's the matter?"

Looking at her mischievous smile, I understood that there must be some selfish reason behind it. I couldn't escape!

To my surprise, Yukari wrapped her arms around my waist and rubbed her face against my chest.

"Hehe, well, you know..."

"Gulp, what is it?"

With her rosy, cherry-like lips so close to mine, slightly parting, she said,

"Well, the room is too cold without heating, but...hehe, Juxi's bed is quite warm!"

"Come on, this way I won't be able to sleep at night!"

I tried to move her hand away, but no matter how much I struggled, I couldn't free my arms from her grip. The only thing I seemed to be able to move were my feet.

Yukari's eyes remained closed, completely ignoring any attempts to wake her.

Damn it, I can't hold back anymore. You forced me to use force!

Luckily, my feet were still free to move, so I stood on tiptoe and stepped on the loose leg of Yukari's pants.

"Umm...!"

Perhaps realizing my sneak attack, her eyebrows slightly furrowed.

Just as I felt like I was about to win, the foot that was pressing on Yukari's pant leg suddenly loosened, startling me. I thought she had vanished into thin air.

"Hmm?"

What, turns out it was just a quick escape from my pajama bottoms, just taking them off....just?!

Just as I was still lost in thought, two thighs like popsicles pinned down my lower body as well!

Yiya--!!

This sensation is simply...no! This is the blatant forcible clamping of my thighs, the elastic and icy cold clearly reflecting the intense stimulation that comes from the body, which nearly caused me to react in an embarrassing manner.

Uh, how can it feel so comfortable...ah, it shouldn't be like this!

Mulling over in my mind, she must be testing me.

"Yo...Yukari-sis, I can't hold on much longer..."

"Huff~huff~huff!"

Breathing so evenly, no matter how I shout, it won't wake her up. Since it's a prank on me, I've decided to play along until the end!

So, I started to imitate her movements, trying to get my body closer to hers. I guessed that if I kept moving back, I would end up in her embrace.

"Hehe, don't blame me, I'm just returning the favor."

After saying that, I twisted my whole body and leaned forward with force!

As I expected, I slid down and reached the same level as Yukari-sis.

And Yukari-sis, still calm and composed, shrank her arms, enclosing my face in her tender neck.

I wonder how long she can hold on with my chin firmly pressing against her chest?

Time passed second by second, until finally, ten minutes...had passed!

"Huff~huff...giggle, Juxi's flustered expression...ha...hilarious."

"Huh?"

I originally thought Yukari-sis, who couldn't continue any longer, had given up and was about to beg for mercy. However, after observing her for a while, I realized she was just talking in her sleep.

Although being like this would make me die happily, a true man would never have such little courage.

That's right! I shouted in my mind, I won't surrender like this!!

Feeling frustrated for quite some time, I even raised my chin as much as possible to avoid touching strange places.

"So...so tired, please...stop playing with me, sis?!"

Looking at her giggling expression, it's obvious she's teasing me.

But in the loose bed, she trapped me tightly in the corner like she was torturing my nerves.

I tried to shrink my mouth as much as possible because if I moved even a centimeter forward, my lips and Yukari-sis' lips would definitely meet!

"Oh no, Yukari-sis, you really fell asleep huh?"

I screamed and wailed in agony, thinking that tomorrow morning might be my end!

Maybe she just wanted to prank me and have some fun, but who knew her plan backfired and she fell asleep due to exhaustion...

(Yukari-sis' morning)

"Mmm, slept so comfortably, the blankets are so warm...this sleep, indeed...hmm!"

Just as the first ray of sunlight in the morning shone through the window, the quiet room instantly came alive with the warmth of the sun.

Yukari opened her sleepy eyes, but this morning's first meal was really intense!

In the instant her eyes opened, she met the sleeping face of the somewhat handsome young man in front of her.

And then...when Yukari woke up from her dream just now, she unintentionally left a lip mark on his lips!

"Ah, ah, ah--!!!"

A long scream echoed through the surrounding neighborhood.

I was also awakened by Yukari's scream, and at that time, I complained about her waking me up.

"Geez, can't a person sleep in peace anymore..."

"Huh, isn't it only a little past seven o'clock?"

I glanced at the time, and the minute hand was slightly before seven, it's not even time yet?

Being still half-awake, I had no defense prepared at all, and then Yukari grabbed my neck and pressed her fingers against it.

"Why... why were you sleeping in my bed!!!"