Next-Door Noona Kim Yujin
The weather had turned cool before she'd even noticed. Inside her studio apartment, though, the air was a world apart from the chill outside — thick, close, and sweltering.
The reason was simple.
She was masturbating. And she had been at it for hours. Her fingers had been rubbing and probing at her sex for so long that her whole body was already soaked through with sweat.
Schlick... squelch...
"Nnh... ah..."
She worked herself roughly, shoving her fingers around the folds of her pussy, but the feeling she wanted refused to come.
"Haa... what am I even supposed to do?"
She looked at the mirror. A woman stared back at her with her legs spread wide, her sex bared completely to the glass. The woman's name was Kim Yujin — big-chested, pretty-faced, and, by her own reckoning, the campus queen of XX University. Not that anyone else seemed particularly convinced. She was convinced enough for the both of them.
Still nothing. Frustrated, Yujin grabbed her phone and opened Twingter.
Twingter was an ordinary social network. Yujin, however, put it to a rather different use. She posted racy photos of her body with her face cropped out, and the replies poured in — everything from worshipful praise to outright abuse. Reading those comments was a pleasure all its own, and she scrolled through the ones on her latest post.
Most of them were either raving about her figure or openly lusting after it. She read them slowly, and as she did, a familiar heat began to coil low in her belly all over again.
She hooked the panties still caught around her thighs and flung them aside, then leaned back against the chair essentially naked, and slowly pushed a finger into the hole she wanted filled so badly. Her clit, wound tight and hypersensitive from the rising heat, peeked out shyly from its hood.
A twitch.
The instant her finger brushed over it, a bright, electric jolt raced up her spine.
"Haa... hah..."
The spark of it was delicious — but it wasn't nearly enough to take her over the edge. She had masturbated so much, for so long, that her body barely responded to her own hands anymore. The comments from the people looking at her photos were about the only stimulation that still worked.
"Maybe I should just... meet one of them."
Several times a day, messages came in through Twingter asking to meet in person. She had always ignored them. The thought of actually going through with it made her stomach turn — because for all the hours she'd spent touching herself, she had never once had sex. She was twenty-two years old and still a virgin.
She had always wanted to give her first time to a man she actually had feelings for. So what she'd settled on instead was this: getting herself off to the imagined gazes of the men who were surely stroking themselves to her pictures. With the hand that wasn't tending her clit, she gave the nipple of one full, rounded breast a light pinch. She was so worked up that the pale pink bud stood stiff and tight. She squeezed, and a sharp, sweet jolt ran through her.
"Haaang... nnhh..."
"I wonder what they think when they look at my pictures... that I'm a pervert? An exhibitionist? Or... a slut?"
The insults she imagined them hurling at her only made her breath come hotter. Her hands moved faster. Her sweat-slick body flushed a deeper red; every pinch of her nipples sent her thoughts scattering, and the moans spilling out of her were thick with heat. Slick, musky arousal was already pouring from her soaked pussy, running down over her ass in a way that only made the whole scene more obscene.
A woman on a studio-apartment chair, hips rolling, completely at the mercy of her own lust. The thought drifted through her — what faces would the other people at university make, if they could see her like this? She pictured them looking at her with contempt. She pictured them looking at her with naked hunger. Her hands sped up, turning rough and frantic.
"Hauuuh... nngh!!"
After about three minutes of that, she could feel it — she was finally going to get there. Her vision was starting to haze over when, right on the brink of climax, something interrupted her.
Ding-dong!
The doorbell. She scrambled off the chair, hurriedly wiped the wetness off the floor, and called out in a voice that still hadn't stopped panting.
"...Who is it...?"
"Delivery."
She had no idea what she might have ordered, but the word delivery was enough. She snatched her panties off the floor and pulled them on, then grabbed the dolphin shorts that had been lying in a heap and stepped into those too, and headed for the front door. The fact that her sleeveless tank was soaked through with sweat had completely slipped her mind.
After lying about being a delivery guy, I stood in front of the door to Room 202.
The heavy metal door, which had been shut tight, swung open. At the same time, a sweet, tangy scent of sweat came creeping out toward me. And standing there in the doorway was the resident of Room 202 — the woman I'd been suspecting was Twingter Jini.

Oh, you've got to be fucking kidding me.
That was the first thought that hit me the moment I saw the woman who'd opened the door.
She was definitely just masturbating.
It was a reasonable suspicion. Her whole body was flushed red and glistening with sweat. Worse, the sleeveless tank she had on was soaked through — look even a little closely and you could see the skin underneath, the fabric clinging to every curve. And that sweet-sour smell rolling off her was enough to make me start getting hard whether I wanted to or not.
"...You're not the delivery guy...? You're... next door?"
She'd recognized me. Yujin's eyebrow twitched.
"Hey, noona."
"I don't think we're close enough for you to just show up out of nowhere. And going as far as pretending to be a delivery driver — what's this actually about?"
She did not sound like she was in a good mood. Her tone had an edge to it. I didn't particularly care. I let my eyes travel over the noona next door, taking in her face and her body in equal measure.
Hair color's about the same. Breast size looks almost identical. Even her figure...?
"I asked you what you want."
I was staring so blatantly that Yujin let the displeasure show on her face, and she started to shut the door. That was when I grabbed it — with a strength I didn't know I had — and held it open, and looked the noona next door in the eye.
"You're Twingter Jini, aren't you. I know everything."
At the words Twingter Jini, the noona next door's face twisted. I didn't let the moment slip.
"Twingter Jini. JINI6974. I even saw the beach selfie you posted recently. All of it."
"...Come inside. We'll talk."
She looked thoroughly startled as she stepped back and let me in. The moment I entered, the thick heat filling the room and that sweet scent of sweat washed over me. There was a wet towel lying on the floor, and it reeked so strongly of a woman in heat that there was no mystery at all about what she'd been wiping up.
"So. What was that you just said."
Yujin sat down on the chair with a look of perfect incomprehension. The flush still burning in her face, though, was the look of someone whose secret had just been found out.
"So you're saying it's not you?"
"I have no idea what you're even talking about."
She was going to deny it to the end. I frowned, just a little, not enough for her to notice.
Guess the evidence is too thin...?
My thoughts were racing, my eyes darting around the room — and then I saw the textbook sitting on the desk. The name written on it: Kim Yujin. And sitting on top of it, a pair of black sunglasses. The exact same pair I'd seen in the photos.
"Then what about those."
Yujin noona's face went panicked the instant she followed my pointing finger to the sunglasses. She lunged up to snatch them and hide them — and that was when the laundry drying rack over by the kitchen caught my eye. More precisely, what was hanging on it: a black bikini. She hadn't taken it down yet. An ordinary black bikini and a micro bikini, sitting there together.
I bolted for the drying rack, snatched the bikini, and held it up right in front of her eyes.
"This... this is what you were wearing in that photo, isn't it?"
Yujin looked at the black bikini, pressed a hand to her forehead, and let out a long sigh.
"Fine... that's me. So what is it you want."
The first person to catch her had turned out to be the guy next door. She felt uneasy about that — and, at the same time, a little bit relieved.
If it had been a stranger, they probably would have blackmailed me with the photos, or demanded I have sex with them. Maybe it's a good thing it's the neighbor? I just hope he doesn't ask for anything too crazy.
I, on the other hand, could only stare at her, dumbfounded, my eyes unsteady.
What do I want...?
I pressed a trembling hand to my pounding chest, trying to calm my heart, and glanced to the right. Floating there was the quest window I'd been seeing all this time.
Touch the breasts of Yujin, owner of the Twingter alt account.
Obviously, there was only one answer. I bowed my head and declared it in a voice of utter conviction.
"Please let me touch your breasts."
"...What?"
Yujin looked at me like that was the last thing on earth she'd expected to hear.
"That's... that's all?"
"Yes!!!"
"Alright..."
Yujin took my hand and quietly guided it to her chest.
Soft.
Very warm, and very yielding. That was the first thing I felt.