The Younger Sister's Gambit
Calling it a "victory" is a bit of a stretch, even if I were to toast to it myself. Unless my sister is currently huddled in the corner of the bed, masturbating in defeat, that doesn't quite fit. So far, all she’s done is struggle and groan while trying to protect her boyfriend. So, rather than a victory… hmm, what would be better? A truce? I don't know. It’s hard to call it a truce when she just spat on my lips and giggled. And when I licked that spit off and chuckled, her cheeks and ears turned bright red instantly. I don't know. A word for fighting while getting along? That’s probably only in a dictionary, so I’ll pass.
I just want to help that massive pervert, Seo Woojin, and pull my innocent sister—the one who got all cocky just because she spat on my lips once, the one who looks strangely pleased to be pinned down beneath me, the one who is slowly starting to resemble me—down to the honest place where I am.
"Hey, Lee Jiyoon…!"
As I began to gently touch the breasts of my sister, who had pinned me down in that sense, she immediately snapped, calling my name in anger—unlike the relaxed way she had been mocking me just moments ago. Yet, watching her shoulders tremble with shivers she couldn't hide, I squeezed her breasts a little harder.
"Ugh…. …Ha…ah……."
"…."
I’d laughed before when people in game chats would seriously argue that women with smaller breasts are more sensitive, but… hmm. In my opinion, that still sounds like total nonsense.
"D-don't touch…. Why are you touching that…."
"If you’re so bitter about it, why didn't you touch mine yesterday? My breasts."
"It’s not because I’m bitter…! …It’s embarrassing, so stop touching them…!"
"I don't find it embarrassing."
"…Ah, damn…. I can't talk to you…. …Ugh…."
It’s not like she’d be twitching like that just because I’m groping the side of her breasts. It’s obviously a combination of the shame of having her breasts touched by her younger sister and the electric pleasure being delivered by Seo Woojin, who is busy performing cunnilingus on the other side. The fact that she keeps moaning is definitely Seo Woojin’s doing. Unless, of course, there’s some absurd secret that my sister is actually a lesbian.
"…Ugh, ugh…, ……hieek…."
After about a minute of kneading her breasts, perhaps she couldn't hold herself up with just her arms anymore, as her weight began to sink into her chest and belly, which had only been lightly touching me before. Every time that happened, I’d glance to the side to see her arms trembling, and when I looked up, I’d catch her face looking down at me with a mix of pleasure and disgust. After a moment of staring, I said,
"Here."
"…Kyaa……?"
To make her more comfortable, and to see what she thought about what I said yesterday, I lightly pulled her into an embrace. Even like this, our breath and cheeks touch, but our lips don't. If she wants to, she can bury her face next to mine, just like I did yesterday. That alone would be enough to get Seo Woojin incredibly excited, thinking the sisters are doing something strange. Oh, of course, if she changed her mind and tried to kiss me… I’d probably dodge it first. Even if I can move enough to make him get a rock-hard erection watching us, I have no intention of actually rubbing against my sister like a lesbian just because Seo Woojin is watching.
"Hey, if you hug me, what are you…."
"You looked like you were struggling. And we were like this yesterday, too, weren't we?"
"What does that have to do with anything…! L-let go, quickly…."
But my sister just grumbled that she didn't like being like this with me, so I erased all the bad thoughts I’d had for a moment.
"…Should I let go? For real?"
"Let go…! It’s disgusting, so let go…."
"…Seo Woojin would like it more if we did this, though?"
"…."
The most effective phrase to hook our innocent sister. Seo Woojin would like it. Watching her turn into a tame sheep at those words, I held back my laughter, tightened my arms around her waist, and whispered into her ear.
"…You saw how much he ejaculated last night. You, too."
"…."
"Just now, even without us doing anything particularly strange, he ejaculated that much just by having the three of us in the same room."
"…."
You know what you have to do if you want to beat me, right? Even as I said things that amounted to that, she didn't utter a single response. If she weren't interested, she would have barked that she wasn't and pushed me away. The fact that she stayed lying on top of me without a single word of protest, the fact that she was letting out pleasant sighs—ha-a, ha-a—right into my ear, and the fact that she was shuddering and climaxing all over under Seo Woojin, who was silently grabbing a condom… it was obvious.
"…If you want to beat me, why don't you bite my shoulder? …Sister?"
"…."
"It’s not your lips, your cheeks, or even your ears. It’s just your shoulder, isn't it?"
"…."
"Otherwise, sister… you might lose to me like you did yesterday……, …ugh."
She was clearly agonizing over it in a positive way.
"…Sister, are you taking revenge?"
"…."
"Pfft…. It’s more ticklish than it is painful…."
"…Shut up…."
Probably meaning "shut up." Along with that adorable reaction, she nibbled on my shoulder. As I shifted my gaze past her, I saw his penis, which remained as firm as it was at the start, despite having already ejaculated twice. I saw Seo Woojin irritably putting a condom on it, and I saw him holding my sister's pelvis with one hand to keep it steady as she shuddered from her climax.
And then.
"…I'm going in, Noona."
"……Hieek, ugh…?"
Instead of gently sliding it in while she was climaxing, he slammed it in so hard that her buttocks rippled. I, who had suddenly become the bed, watched it all unfold.
"Wait…. Woojin, ah…. A little slower…, please…."
Every time a lewd slapping sound echoed, my sister’s voice broke. I was just lying underneath her, holding her tight, but I could feel exactly how they were moving and how hard Seo Woojin was thrusting. It was being transmitted vividly to me, right beneath her. It felt a little strange.
…It doesn't feel like I’m just being used as a mat; it feels like I’m having sex with my sister.
"…."
So my sister must have felt something similar yesterday…. …. …Ugh.
"You don't really like it when I go slow, do you?"
"That’s not… Hey…."
"You told me to thrust hard while choking you earlier, before Jiyoon got here, didn't you?"
"…Hey, hey…! If you say that, what am I supposed to…."
But Seo Woojin didn't seem to care at all what I was thinking.
"She knows, too. That you have that kind of taste, Noona."
"…Ugh…."
"…So, shall we go slow?"
"…."
Seeing my sister tangled on top of me, he got incredibly excited and just thrust his hips violently, saying, "…D-do whatever you want…."
"Then I want to go slow."
"…."
He spoke only to her, thrusting relentlessly. "…D-do it… hard…."
"Ugh, ugh…, ah…. …Hi, ugh………♡"
"…."
…I felt a little spiteful. Even though he’d just had great sex in front of me, I felt a greedy desire to hog his attention even now. Feeling the love juice leaking from their junction—where they were slamming together—touch my own vulva, I carefully slid my hand between my sister’s chest and mine.
"…?! Hey, Lee Ji…yoon…. Take your hand, off…!"
"…How do you touch yourself when you masturbate? Sister?"
"You crazy…, bitch…."
"Why? I’m just saying I’ll make you feel good instead of Seo Woojin."
"Ah, ah…. Woojin, wait…."
"…Ah, do you touch yourself like I do? Like this?"
"……?!?"
Because of her weight, it was impossible to fondle her nipples as I pleased. But I could easily squeeze and twist them between my two fingers. Especially since they were standing so erect, squeezing and twisting them was a piece of cake. Wondering if it would have an effect, I blew air into her ear, and while I gnawed on her already swollen nipples, I said,
"Hey, Lee Ji, yoon…. Take your hand, off……."
"…It seems you masturbate the same way I do, sister?"
"Stop saying… weird things…."
"I like teasing myself like this, too. …Is it because we’re sisters?"
When my sister, who had already soiled the bed, was climaxing pleasantly while drooling on my shoulder, I looked at Seo Woojin, who was still using her like an onahole.
"…Seo Woojin."
"…?"
"Sister’s pussy…. …Does it feel good?"
"…Yeah."
"Hey, hey…! Don't say… weird… things…. Shut up…."
"How much?"
"…If you ask how much, what am I supposed to answer? Would you understand if I said the root of my cock is already throbbing?"
"I don't need to understand…. You can just compare it with someone else. Like me. Here. Sister. Which one of us has a… pussy that feels better?"
"…."
"Lee Ji, yoon…. Shut your… mouth…."
I’d thrown out a sensitive question. …Ah, of course. Unlike my sister, who was embarrassed next to me, Seo Woojin could see right through what I was thinking.
"…I don't think it’s worth comparing."
"Still, there must be someone you feel like you want to keep having sex with, right?"
"…Then, well…. I prefer Hayoon Noona over you."
"Ugh…. Don't say that just because she’s here. …You didn't say that when you were alone with me."
Look at that. My sister is just burying her head in my side, drooling and twitching. He’s choosing his words with a smirk.
"That was just something I said to make you feel good."
"Oh~ so you tell me things like you want to have sex with me all night, or that you want to fill the whole hour no matter what, just to make me feel good?"
"…I don't think I went that far. What are you going to do if you get beaten by Noona later?"
"What do you mean? I’ll just sneak over to you later and ask you to treat me."
"Ha, ugh……?!"
My sister reached out her arm as if to pinch my cheek, and Seo Woojin slammed his cock into her—*thwack, thwack*—like beasts mating, forcing her to arch her back and moan again. Before long, Seo Woojin let out a pleasant sigh, pulled his cock out of my sister, and… tossed the condom, full of love juice, onto my sister’s back.
"…To be honest, there’s no real difference in the pussy."
"…."
"…."
"But the fellatio… that was a bit different."
"…."
"…."
No matter how I chewed on it, it sounded like he was asking for fellatio. Because of the multiple climaxes, my sister, who had been panting pleasantly on top of me, and I, who had wanted to see my sister bite her lips in jealousy, both—one after another, as if by agreement—knelt on the bed and crawled toward Seo Woojin’s cock.
"Lee Jiyoon…. Move…. You’re in the way…."
"…Sister, are you good at fellatio?"
"…Better than you."
"I’ve made him cum with just fellatio before, you know?"
"D-do you think I haven't…?"
"…Anyway, move over. You can't put the whole thing in your mouth anyway, sister."
"I-I can put it in halfway…. …Hey! Why are you putting your spit on it first…!"
"…Pfft…. If you don't like it, cover it with your own spit…."
Seo Woojin, who had a strangely satisfied look on his face. Seo Woojin, who was so excited his cock was twitching, even considering he was on the verge of ejaculating. The two of us sisters, side by side, kneeling in harmony, looking up at him.