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As Airi moved her fingers over her underwear a few times, surrendering herself to the sweet pleasure, her older sister removed her face from Someya-senpai's crotch and stood up. Then she put her hands on a tree and stuck out her buttocks.
Big sis, people call you pure, but you're naughty... Even though it was in the dark, you exposed your private parts to Someya-senpai like that.
Ah... Someya-senpai took off my sister's panties... And then he touched my private parts with his fingers, just like Airi is doing now.
A few minutes later.
"......"
Airi was comforting herself by imitating Someya-senpai's fingers going in and out of her sister's sensitive spot.
I saw Someya-senpai stand up and bring his huge, erect penis close to my sister's ass.
"There's something that big... inside of this..."
Unconsciously, Airi had inserted her fingers not on top of her underwear, but inside it. Airi's pussy was dripping wet.
Inside here... right here, Onee-san, is Someya-senpai's male organ...
Someya-senpai leans his face close to Onee-chan's ear and tells her something.
"That's nice..."
Of course, Airi couldn't hear what was being said from where she was, but there was only one thing to say at a time like this.
I like you, I love you. Words like that. I'm so jealous of the girls who get to say those things to me.
While I was thinking about that, Someya-senpai pushed his hips forward and inserted his penis into my sister. ...…Huh, he's not wearing a condom…?
The man's organ was completely swallowed up inside his older sister, and it began to go in and out as Someya-senpai moved his hips back and forth.
"Hmmm, ahhh... hmmm..."
While watching Someya-senpai and her sister having sex, Airi moves her fingers as if digging around in her private parts.
"Hmmm, hmmm... Ah... hmmm"
It felt good when he touched me over my underwear, but it feels so much better now.
But I'm sure it feels even better for Onee-chan to be loved by Someya-senpai...
Thinking that, Airi's fingers also become stronger as she moves them.
"Ah, ahh, mmm... what, it feels so good... mmm."
Airi had never done anything like this before, never tried to comfort herself.
And now, as I watch Someya-senpai and my sister having sex, I am soothing my heated body.
Right now, Airi's body is mostly filled with the feeling of "pleasure," and the rest is filled with sadness. As if to expel that sad feeling, Airi thrusts her finger deep inside.
"Hmm, Ah, Onee-chan, we might have a baby, I don't know... Hmm, Ah, hmm... Don't even use a condom... Ahh, what... it looks like it feels good..."
Airi is moving her hands as if searching for a spot that feels good to her, but I think her sister feels even better. I envy that.
Having sex with the person you love, being desired, having them whisper words of love to you, and making you feel good.
"...Ah, fuu... mmm... Someya-senpai, mm... Someya-senpai's... ah, mmm..."
At first, she was afraid to put a finger inside herself so she only put her index finger, but then she wasn't satisfied and started putting her middle finger inside as well.
"Hmmm, Ah, Hmmm, Mmmm... Ah, Mmmm...!"
The pleasure was even sharper than before. His fingers rubbed against her, digging deep inside her.
"Ah, ah, mmm, mmm... ah, hmph...!"
It feels good... A feeling of pleasure is overflowing from within, filling Airi's body.
Realizing that his voice was gradually getting louder, he bit the sleeve of his left hand to muffle it.
"Hmmmm... hmm... ahhh."
Then, a woman's voice that isn't Airi's is heard.
A high-pitched moan. Airi had heard this voice before. ...It was in her own room. And the source of the voice was in the next room.
In other words, the sound of your sister moaning with pleasure.
My sister and Airi are far apart, but it's late at night, there are no people around, and no insects can be heard, so I can hear my sister's voice all the way here...
It's a little worrying, but it's proof that Someya-senpai is making me feel good.
"Hmm, hmm... ah, hmm... hmm, hmm..."
Airi continues to move her fingers while looking at her older sister.
Someya-senpai's male organ... if it were inside Airi... it would probably feel even better... I know that Airi has no right to be loved by Someya-senpai, but I can't help but imagine it.
Someya-senpai's hip movements change from rough to gentle, and then to rubbing. Someya-senpai seems to be good at sex...
"Hmmm, ah, hmm, hmmm.... hmmm, uh, hmmm..."
As I was thinking about this and moving my fingers with all my heart, a tingling sensation ran through my body, as if something incomprehensible was welling up from deep within.
"Hmm, ah, no... something... hmm, I'm coming..."
Still, Airi's instincts seemed to be calling for pleasure, and she couldn't stop her fingers. Airi took her mouth off the sleeve she had been biting, and just moaned in delight at the new sensation.
"Hmm, ahhh, ah, no, it's no good, Airi... it's coming... from inside me... hmmmm!!"
Then, as if an electric shock was running through her entire body, Airi's body began to tremble violently.
"...So this is what it means to come...?"
It was a new sensation for Airi. But the moment it hit her, it felt amazing.
But the two girls are still in love. Even from afar, Airi can clearly see how much they are enjoying it.
"...I'm sorry, Onee-chan and Someya-senpai...But I won't show this to anyone..."
As she muttered this, Airi pointed her smartphone at the boys and started taking pictures with zoom. Of course, I won't show anyone, but look... if Airi knew how good it felt, she'd probably do it again at home.
At times like those, I feel like I am projecting my feelings onto my older sister who is loved by Someya-senpai.
"If it's just this much, you'll forgive me, right...?"