Chapter Index

    Lee Yu-ri has always been sincere, polite, and good at studying, living as an example to others.

    In her life, she could never dream of anything like deviance, and she herself had no interest in deviant behavior.

    For her, the adult world – drinking, clubs, bars, nights out, sex, etc. – was a completely different world.

    And under Han Seong-jin’s hands, Lee Yu-ri, who tried everything except clubs, was no longer the nerd she used to be.

    She moaned like a woman under a man, had no objection to making love in public places, and even sneaked out of gym class and had thrilling sex behind the academy building.

    It was Choi Soo-yeon, who was not present, who put an end to the depravity of Lee Yu-ri.

    On the day of the foursome, Choi Soo-yeon, who was overly excited, kissed Yu-ri Lee, who was riding, and something inside Lee Yu-ri shattered.

    Yuri Lee was neither bi nor lesbian, but purely heterosexual.

    However, in Yu-ri Lee’s brain, who was intoxicated with the forbidden pleasures that the foursome brought, in addition to the shocking memories of that day, they came together to create a new pleasure.

    When her sexual excitement exceeds her limit, Lee Yu-ri develops a strange formula in her head that if she kisses anyone, like last time, she can reach a climax even greater than her climax.

    Han Seong-jin started the story and Choi Soo-yeon ended it. Lee Yu-ri has completely degenerated and is now dragging her older sister in.

    #####

    Yuri gave Yumin a deep kiss that wasn’t just a kiss with the lips touching, but a kiss with the tongue.

    The last time Soo-yeon kissed him, he was so disgusted, but he got drunk and got a little sick of it, and from that day on, he seemed to have woken up to something, and now he was holding his sister’s hands clasped and kissing her.

    “Whoop… Hey, hey Yuri! What are you doing?! Are you crazy!?”

    Yumin showed the same reaction as Yuri last time and was disgusted.

    But Yuri grabbed Yumin’s cheeks again and kissed her again.

    “Whoop! Ubububbub!!”

    “Paha…♡ Don’t do that… Let’s have fun together, sister♡ This feels better than I thought?”

    “Pugh! Oh, you must be crazy!”

    “Ugh, my sister is pretty~”

    Yuri’s appearance is so gentle that it’s hard to believe that they reconciled today after being in a cold war for nearly two months.

    The problem was that the texture wasn’t in the normal direction… but since it looks ugly, let’s just assume there is no problem.

    “Hey, wait a minute…! Hmph?!”

    “Haaaang! Ah! Haub… boop! Ah, stand… Seongjin…! Hiyaang!”

    Yuri continued to kiss Yumin and moaned at my pistoning, and then kissed Yumin again and moaned again.

    Yuri’s big breasts, broken and broken, were clasping hands and kissing her sister repeatedly, bouncing up and down in sync with my pistoning.

    I leaned down and kissed Yuri again, holding her shaking big breasts with both hands.

    “Whoop…♡”

    “Yuri, are you leaving the boyfriend you love and cheating on him with your sister? Are you jealous of this?”

    “Heugh… Aang… I’m sorry… I won’t blow it…♡ So, Kishu… more seaweed…♡”

    “I’m going to punish you a little because you cheated.”

    “Ah…”

    I lightly bit Yuri’s lower lip, parted my lips, and pulled my cock out of her body.

    Yuri looks sad.

    However, she was already drunk and the excessive pleasure of sex overtook her body, leaving her breathless and unable to move from the bed.

    Then, I took off Yumin’s clothes, made her naked, and placed my dick at the entrance to her vagina.

    “How dare you take your younger sister away from me? I need to educate you.”

    “No, what are you talking about!? I didn’t do it! And now there are two kids next to me…”

    Phuuk-

    “History…♥”

    As I plunged my dick into him without answering questions, Yumin tilted his head back and grabbed both of my arms, trembling.

    “I haven’t even touched it properly, but it’s already wet like this? Are you excited to see us doing it?”

    “Me, you bastard…♥ There’s Yuri next to me… Ugh, there’s Eunji too… Argh!”

    Phew!

    When Yumin was thrust into her waist once more, she stopped what she was saying and let out an urgent moan.

    Yumin was struggling feebly and trying in vain to resist, but as the cock hit the entrance to her uterus a few times, he became weaker and weaker.

    And at some point, I gave up resistance and unconsciously lifted my hips slightly and spread my legs wide in a V shape, ending up in a posture that reached my waist.

    “Ugh… Aang…♥ Oh, I hate it…♥”

    “You say no with your mouth, but your pussy is so tight?”

    “His… well, that’s a physiological phenomenon…”

    “Really?”

    I pounced on Yumin’s lips as he continued to deny it.

    As soon as our lips overlapped, Yumin immediately closed his eyes and frantically mixed his tongue, stretching out his arms to wrap around my neck.

    My back didn’t rest even while I was touching Yumin’s juicy breasts, pinching her nipples, and feeling the feel of each other’s tongues.

    I traced Yumin’s areolas, which were a little larger than the other two, with my fingers, and when I grabbed and twisted the cute, prominent nipples with my fingers, Yumin’s pussy tightened around my cock.

    After kissing for a while, I parted my lips and gently rotated her areolas with both index fingers and spoke.

    “Just by kissing you, you automatically hug me and my pussy gets squeezed. Is this really a physiological phenomenon?”

    “Haan… Hmm… Bird, it’s a physiological phenomenon…”

    “Yuri, your sister keeps lying.”

    Then Yuri, who was watching us having sex right next to us, came up with her eyes wide open and grabbed Yumin’s cheek with both hands.

    “Hehe… Sister, lying is bad…♡”

    “You, you really don’t do it?! Really… wow!”

    With that, Yuri attacked her sister’s lips again.

    Yumin desperately tried to resist, but I grabbed her arms.

    And as he pulled his arm towards me, he plunged his cock even deeper.

    “Oop!!!”

    Yumin is used as an onahole with the freedom of both arms taken away.

    The cock was already piercing her womb, and her lips were being snatched away by her younger brother.

    Yumin’s eyes began to gradually relax as he began to be forcibly absorbed in the forbidden pleasure.

    “Ha… master…♡ I am your master…♡”

    And Eunji, who had been watching me, Yuri, and Yumin having sex, seemed to be unable to bear it any longer, got up from the bed, came up behind me, and gave me a back hug.

    Eunji’s erect nipples tickled my back, and I felt the texture of her pubic hair near my buttocks.

    “Phew…”

    My cock slowly began to tremble from the dizzying pleasure.

    Then Yuri took her mouth off Yumin’s lips and got on top of her older sister, showing her buttocks to me and taking a prone position.

    “Seongjin…♡ I’m sorry for cheating on you with my sister…Put your dick on me again…♡”

    Yumin is lying down and Yuri is lying on top of her, with their chests pressed together.

    Their pussies were touching and open towards me.

    Between the cracks, white foam and water mixed with love juice, Cooper juice, and a little semen flowed.

    I grinned while stroking Yuri’s pussy with one hand and Yumin’s pussy with the other.

    “Really? Do you want me to eat yuri?”

    “Yes, eat it…♡”

    Yuri blushed as she grabbed her pussy with both hands and spread it wide.

    She had long since become a woman with no trace of shame in bed.

    And Yumin opened his mouth in shock at the sight of his younger brother’s changed appearance.

    He said he also had sex with me, but he didn’t have the confidence to do something like this.

    “Yes, as the boyfriend, I have to forgive my girlfriend again.”

    “Ehehe… Thank you Seongjinaang…♡”

    Zbook-

    “Hey…♡”

    As the cock was inserted from behind, Yuri’s body trembled with joy and her vagina tightened.

    “Haaaang! Ah, this is awesome…♡ Ah! Seongjinaaa…♡ Ah, you’re so cute…♡ Please make me pregnant, I want to have a child, Seongjin…♡”

    Yuri honestly revealed her desire for me, even saying out loud that she wanted to get pregnant.

    Of course, I was taking contraceptive pills because both Yuri and I would be in trouble if we actually got pregnant, but as soon as he said this, a tremendous sense of accomplishment as a male welled up in my heart.

    “Okay, then I will cum inside you, so you will definitely get pregnant!”

    “Ugh, I’ll do it, I’ll do it♡ Because I’m going to get pregnant…♡”

    As long as you take birth control pills, even if you ejaculate, you won’t get pregnant right away, but I moved my hips with the intention of getting pregnant, and Yuri with the intention of getting pregnant.

    “Pfft…!!”

    “Hhhhh!!”

    While pistoning like that, we climaxed at the same time, and while my semen filled Yuri’s womb, Yuri hugged her sister underneath her and trembled.

    “Phew…”

    When the dick was pulled out from inside Yuri’s vagina, semen flowed out and down Yumin’s vagina underneath.

    “Haaa… Haaa…♡”

    Yuri, who was shaking as she felt an orgasm, looked at her older sister underneath her and smiled brightly with a relaxed expression.

    “Hehe… Sister, you’re still embarrassed…”

    “Isn’t it obvious? No matter what, there are two people next to me… they put me down too…”

    “What should we do with our shy Yumin?”

    “Hehe, then Seongjinaaa~”

    Yuri still called to me with his tongue curled and his voice tickling.

    He then lay down next to Yumin and opened her pussy with his hands.

    “Ehehe… My sister… Fuck me with me until I’m no longer shy~♡”

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