As an Older Sister
I had a rough idea of what Woojin would like. …After all, that was the whole reason I allowed him to have sex in my room in the first place. I wanted to stimulate him intensely while holding back until he’d used up two condoms, and then, just as he was fully aroused from having sex with you, Jiyoon, I intended to steal him away for myself…?
"…."
But.
"…This position is a bit, embarrassing…."
I never imagined that just this much would make Woojin fill a condom with an amount of ejaculate incomparable to his usual volume. And not just Woojin, but Jiyoon, too. I didn't expect her usual calm demeanor to vanish, her cheeks flushing red to the tips of her ears as she glanced at me. I didn't know… that both of them would enjoy it this much.
"If we're talking about embarrassment, I'd think being fucked like a dog would be worse."
"That’s because you can’t see… my face, sister…."
…Still, though…. I’d seen Woojin on the sofa yesterday, so I wasn't entirely surprised by him. But not her. Jiyoon is truly a mystery. Why does she enjoy it that much…? Does she have some kind of exhibitionist streak? It’s not like she’s naturally sensitive—her reactions on the sofa yesterday were strange, too…. Is being watched by me while having sex… really that pleasurable?
If she had truly stolen Woojin away from me, that would be one thing, but right now, they were just having intense sex right in front of me. Or perhaps…. It might not be a Jiyoon problem, but a Woojin problem. Maybe having sex with a Woojin who is so aroused that his focus is drifting is just incredibly good…. That might be what it means.
"You don't like this position because you're making eye contact with me?"
"…It’s not that I don’t like it. It’s just… embarrassing…."
Unlike a moment ago, Jiyoon was lying flat on her back, her legs spread wide as Seo Woojin pressed down firmly on the backs of her knees. …Perhaps it’s because of the position. Her lower abdomen, where his cock—which hadn't shrunk even a bit despite having just ejaculated, and actually seemed to have grown even larger—rested, was a sight that stole my gaze. It was a cock that could easily reach the navel of even Jiyoon, who is slightly taller than me. I, being slightly shorter than her, felt my heart race at the thought of what would happen to me. In front of two women—no, two sisters—it was a lewd, perverted cock that was clearly, visibly aroused.
"…Since your sister is watching, let's finish this quickly. …Okay?"
"…Okay."
The cock that had just broken Jiyoon in so pleasurably, its shaft tightly constricted by a thin, thin condom, pried open Jiyoon’s vaginal opening, which was slick with transparent pre-cum. And then, just like that. As if taming Jiyoon’s body. …As if showing off to me, who was kneeling beside them.
"…Hick……. …Ugh…. …It’s deep…."
Shallowly. Gently. Slowly. Rubbing against her from the tip, step by step. Deeper inside. Until Jiyoon gripped my bedsheets tightly. Deeper inside. Until Jiyoon threw her head back and let out a breathless, shameful moan. Deeper inside. To the point where I could see Jiyoon’s trembling thighs and, beneath them, her buttocks, the flesh pushed out by the pressure of Seo Woojin’s hard lower abdomen. Deeper inside. …As if to show that it had gone in that far, her slightly bulging lower abdomen was fully visible. Deeper inside. Leisurely. He thrust his cock in.
"…Why do you like it so much? You don't usually react like this."
"…I don’t, knooow…."
Unlike when he was always sweet in front of me, perhaps because they are the same age…. Like when he called me 'oppa' and we had sex. He spoke in a slightly teasing voice.
"Are you aroused because your sister is watching?"
"It’s not that…."
He had hit the nail on the head, making that cynical Jiyoon shake her head like a child.
"…What do you mean it's not? You’re clenching much tighter than when we’re alone."
"That’s just because… your cock got bigger…, ……Ugh…."
He stabbed at the bullseye once more. Seo Woojin began to probe for the secrets Jiyoon wanted to hide, thrusting his hips to target only the innermost part, the portio, enjoying Jiyoon’s reaction. Watching him blankly, I slowly swallowed the saliva pooling under my tongue and moved closer to the two of them.
…I swear, I wasn't aroused by watching my boyfriend have sex with my younger sister. If anything, I was annoyed; it’s impossible to be aroused by something like that unless you’re the type of pervert who looks up NTR content. However. Truly, it wasn't a matter of my taste, but because of Woojin.
"It’s not like there’s a big difference. It’s not like it became harder to put the condom on. …It’s just engorged with blood."
"You just want to hear me say it with my own mouth—that you're aroused because your sister is here…."
It was the same when he asked me to move aside to look for a condom earlier. And now, as he rubs his hips against her while urging Jiyoon to tell the truth, he seems much more aroused than Jiyoon, who is reaching out her hand, repeating desperate words like 'wait, wait,' as if trying to shut him up while he crushes her vaginal opening and portio with his glans.
"Ugh…ugh"