A Precious Promise to Touch Dohui's Pussy...♥ Time to Keep It...♥
After spending the night with Yoon Seohye.
When I finally returned home after wrapping up preparations for that heated presentation.
What greeted me was my younger sister in nothing but underwear.
“Huh? What are you doing here? And what the hell are you wearing?”
“Elder brother, you have returned?”
She was wearing one of the sample pieces we’d brought home, striking a blatantly erotic pose right in front of me. Cha Dohui.
“…Hey, what are you doing in my room? Put some clothes on right now…!”
“Brother… that is not the issue at hand… The fact that your bag is overflowing with women’s underwear… and that you even know my exact size… Could this perhaps be a gift for me?♥ Lingerie as a present… what exactly does this mean?”
“What gift… Those are just company samples. Take it off already.”
Hmm. Passing them off as a gift?
It might not be such a bad idea.
“Hmmm, so my brother has these kinds of tastes… If only I had known sooner, I would have matched them for you…”
“…What kind of tastes?”
“Well… the kind where you enjoy dressing your girlfriend in such lewd lingerie… for example, ripping her panties off…?”
“…No way that’s true!”
Cough.
She was talking as if she knew something but also didn’t, and it felt almost mystical.
“Sigh… This girl has been worried sick that her elder brother might walk the path of lust with other women using those mystical fingers of his…”
“You’ve been reading weird novels again. Maybe I should cut off your allowance. Just take that off and get out.”
“Ahh… You are as cold as ever today…”
Dohui’s dramatic way of speaking came from her love of historical dramas and her dream of becoming an actress.
At my coldly indifferent words, Dohui’s face flushed red.
“But… elder brother. Are you commanding me to disrobe right here? If you wish to watch this Dohui… remove her clothes… then I shall gladly obey. If you wish to take photographs for your private collection, that would also be acceptable…”
“…No way!”
Whether I protested or not.
She was pushing her modest breasts together, trying to appeal to me somehow.
…Even when she squeezed them, they still didn’t reach even half the size of Seohye’s voluptuous chest.
Still, their shape was undeniably pretty.
She was even tugging her bra down to fully expose them…!

I didn’t know when they had grown, but they were the perfect moderate size.
Cute little nipples.
They had the unmistakable air of something brand new, like they had never been touched before.
…Ever since joining a lingerie company, I had studied up on breasts.
I now had enough of an eye to casually appraise a woman’s chest.
“Ahh… Elder brother, the way you always treat this girl with such icy indifference… It is exactly like the Northern Grand Duke.”
“Are you reading romance-fantasy novels now too? Stop consuming that stuff.”
“Brother! Telling this girl not to seek comfort for her loneliness, how cruel you are.”
“Fine, whatever. Just get out. I’m tired.”
Instead.
Dohui flopped straight onto my bed as if daring me.
Thump.
And she even flashed a bright smile.
“Hehe.”
“What are you doing? Why are you lying there?”
“Elder brother. Elder brother. Do you happen to know about happiness hormones?”
“That story again?”
“They say when a person embraces someone, happiness hormones are released in the body. These hormones relieve fatigue, reduce stress, and… Anyway! They are incredibly beneficial hormones!”
I knew it all too well.
She had recited it since we were children until my ears nearly bled.
The words she had repeated like brainwashing.
“So?”
“How would you feel about holding your adorable little sister in your arms and sleeping with her tonight…? Now that I have become a perfect adult, there are things I wish to try…!”
…So that’s what all this was for today!
Seriously.
“Are you insane…?”
It was just the two of us at home.
Our parents had been away in the countryside for a long time, taking over Grandmother’s business.
That meant we spent a lot of time alone together….
Naturally, I could feel Dohui relying on me more and more.
So I had taken even better care of her.
Maybe that was why she had turned into a full-blown brocon.
“Elder brother. Have you perhaps forgotten the promise you made with me?”
“What?”
Dohui put on an extremely shocked expression.
Then she collapsed sideways like the tragic heroine of a melodrama.
Thump.
“Sob. Have you forgotten the promise that once I turned twenty, you would allow me to complete my research on your fingers? How terribly disappointing!”
“Ah.”
It came back to me.
It was all thanks to my little sister that I had realized there was something special about my fingers.
When our hands had accidentally brushed, Dohui had let out a soft “Ugh—” and collapsed right there.
Startled, I had checked on her only to find her body trembling with a strangely sensual look on her face.
After that she had constantly eyed my fingers, saying there were things she wanted to test(?).
But out of sheer annoyance I had promised that on her twentieth birthday I would let her use them for a day or so(?). It seemed she remembered.
Since her birthday had been yesterday.
She had more than enough justification to demand I keep my word.
“So you remember? If you had not, I was about to permanently strike the spicy doenjang jjigae that elder brother loves so much from the breakfast menu.”
Gasp.
No way.
Dohui’s special spicy doenjang stew that stole every grain of rice…!
“Hey, hey, isn’t it too low to threaten me with food?”
“Hmph.”
“Ugh…”
…Given the circumstances, Dohui had taken over all the housework. At first her dishes had been wildly experimental, but now her skills had far surpassed the “edible” stage.
“And… instead of the pure white rice brother likes, I will make multigrain rice packed with every kind of grain. The eggs will not be soft-boiled either. I shall fry them until they are completely hard and dry!”
“Sigh… Just wait a second.”
I sat down lightly on the edge of the bed where Dohui was lying, leaning back.
Soft.
She stared up at me with those bright, sparkling eyes.
Her posture… was impossibly seductive.
“I’ll lend it for a little while.”
“Gasp! You have finally made up your mind, elder brother!”
“Just a little while. I need to rest before I get back to work.”
“Hmmmm… Bringing outside work into the house? What a terrible company!”
“Hey, this is how I earn our living expenses now.”
“Then… will you show me your finger?”
“Just for a moment.”
“You promised a full day, so today I shall explore it for exactly one twenty-fourth of that time.”
“Huh?”
I had tried to gloss over it, but she had caught me by the collar.
If my sister planned to bother me for a full hour every time she felt like it, I would end up spending at least twenty-four sessions satisfying her.
…Whatever. Let’s just get it over with.
When I held out my finger, Dohui sat up and began her examination in earnest.
A notebook and pen suddenly appeared from somewhere near her backside.
No… where on earth was she keeping those?!
As she stroked my finger, she let out the same “Ugh—” sound as before and wore a satisfied expression.
“Yes. This sensation. My body still remembers it. Moreover, the shape of this finger… is truly so erotic…”
Then she brought it to her nose and inhaled.
Sniff. Sniff.
“Hmmm… Why does elder brother’s finger smell so savory and wonderful… Hm!?”
“…What?”
But the expression on Dohui’s face as she smelled it suddenly twisted.
She rolled her eyes left and right, turning dead serious.
Her expressions changed so quickly. Maybe it was because she was honest with her emotions?
Thanks to that, it had often helped me avoid annoying arguments.
“Elder brother… you stayed out last night. Were you with a woman?”
“…Huh? Yeah, it was a woman. A colleague from work.”
“Wow! How long has it been since you joined the company and you are already enjoying an office romance…!?”
“……”
What was this?
This strangely oppressive line of questioning.
“It was for work… Anyway, it’s not the perverted thing you’re imagining. And… is that not allowed?”
But Dohui’s face instantly switched to a very pleased expression.
“It is allowed! Elder brother, I am truly delighted…”
“Huh?”
Dohui lifted her eyes in thought, then continued.
“During your school days you lived as if you had built walls against the very existence of women… So this girl wondered every night whether her brother’s sexual tastes might be unique. Do you know how much I worried?”
“…Why are you worrying about that? And they’re extremely normal! I like women!”
“Ahh…! As expected. Elder brother. I can only imagine what you did with this index finger yesterday, but… it is something this little sister can be very proud of.”
“Hey, hey, stop imagining it. And why is your face turning red!”
That was how it had been.
In the past, it wasn’t only my sister who made strange faces when touched by my fingers.
Classmates.
Dangerous moments had happened from time to time.
One of the delinquent girls had nearly led things to a dizzying situation.
Preventing myself from crossing the line with sheer reason during those stormy years of adolescence had taken tremendous mental strength.
After that, I had become extremely cautious about touching women.
Because if they suddenly got excited like Assistant Manager Lee Yena or Seohye, it would be a problem.
Dohui, who had been fiddling with my finger, suddenly turned shy.
“Elder brother… even though this is a used finger that someone else touched only yesterday, to reach the results of my research… I believe I must proceed.”
“…What? Why are you being so unnecessarily serious?”
“Hehe. If… only if my brother permits it…”
After a long, hesitant pause, she asked.
“Would it be acceptable if I gently placed it upon my Y-zone?”
Then she began pulling my finger toward her pussy.
“What the hell is with this finger…”
By the time I muttered that, it was already dangerously close.
“Ugh…♥”