Class is in Session

The clock on the wall ticked past midnight in the Nmixx dorm, the kind of quiet night where the city outside hummed faintly through the windows, but inside, it was all soft laughter and the rustle of blankets.

Haewon stretched out on the living room couch, her legs dangling over the armrest, wearing nothing but an oversized t-shirt that barely skimmed her thighs. Lily was curled up in the armchair across from her, scrolling through her phone, her hair tied back in a messy ponytail. Kyujin, the youngest, sat cross-legged on the floor, hugging a pillow to her chest, her eyes wide as she listened to the older girls chat.

"You know, Kyujin-ah," Haewon started, her voice low and teasing, like she was sharing a secret, "you've been with us for what, almost a year now? And you're still acting like sex is some big mystery." She grinned, popping a piece of gum into her mouth and chewing slowly.

Kyujin flushed, burying her face in the pillow for a second before peeking out. "Unnie, it's not like that. I just... I haven't had the chance. Practice, schedules, all that. And guys our age are idiots anyway." She fiddled with the hem of her pajama shorts, her cheeks turning pink under the dim lamp light.

Lily looked up from her phone, setting it aside with a soft chuckle. "She's right, though. But come on, we're idols. We don't have time for dating apps or blind dates. That's why sharing is caring, right?" She winked at Haewon, who nodded enthusiastically.

"Exactly. Remember how we met him? At that after-party last year? One thing led to another, and boom—shared boyfriend. Best decision ever." Haewon sat up, leaning forward with her elbows on her knees. "He's discreet, he's hot, and he knows how to keep up with us. No drama, just fun."

Kyujin's eyes darted between them, curiosity winning over embarrassment. "Wait, you both... with the same guy? Like, at the same time? How does that even work without it being weird?"

Haewon laughed, a bright, genuine sound that filled the room. "It works because we talk about it. No jealousy, just honesty. And trust me, once you try it, you'll get why. He's got this way of making you feel like you're the only one in the world, even if we're all there."

Lily nodded, her expression turning a bit more serious. "But seriously, Kyujin, you're eighteen now. You can't keep pretending you're not interested. I saw you staring at that drama last week—the one with all the steamy scenes. You were glued to the screen."

Kyujin groaned, hiding her face again. "Okay, fine! It looks... intense. But what if I'm bad at it? What if I mess up?"

"That's what we're here for," Haewon said, reaching down to ruffle Kyujin's hair. "To teach you. No one's born knowing this stuff. We can call him over tonight. The others are probably asleep anyway—Sullyoon and Bae crashed early after that dance practice."

Lily pulled out her phone again, already typing. "I'm texting him now. He lives close; he'll be here in twenty. And don't worry, Kyujin. We'll start slow. Show you the ropes, literally if you want." She smirked, and Kyujin swatted at her playfully.

The next few minutes stretched out with easy chatter. Haewon grabbed some snacks from the kitchen—chips and sodas—passing them around as they talked about everything and nothing. Kyujin opened up a bit more, admitting she'd kissed a guy once at a fan sign but nothing beyond that. Haewon shared a story from her first time, how awkward it was with fumbling hands and nervous laughs, making Kyujin relax with giggles. Lily chimed in with tips on what felt good, keeping it light but real, like sisters dishing advice.

"The key is communication," Lily said, sipping her soda. "Tell him what you like. And don't be afraid to take control sometimes. Guys love that."

"Yeah, and foreplay is everything," Haewon added. "Rushing in is no fun. Build it up, tease a little. Makes the payoff huge."

Kyujin nodded, absorbing it all, her initial shyness fading into excitement. The doorbell buzzed softly, and Haewon jumped up. "That's him. Act natural."

She opened the door to their shared boyfriend—tall, broad-shouldered, with that easy smile that made the girls' hearts skip. He stepped in, kicking off his shoes, carrying a bag of takeout as a peace offering. "Hey, beauties. Missed me?" His voice was warm, a little rough from the late hour.

Lily stood to hug him, pressing a quick kiss to his cheek. "Always. Come meet Kyujin properly. She's joining the club tonight."

He turned to Kyujin, who was still on the floor, and offered a hand to pull her up. "Hey, I'm... well, you know my name. Heard a lot about you. You’re even more beautiful in person. Hope you know we can do this at your pace. No pressure."

Kyujin took his hand, standing a bit unsteadily, her palm sweaty. "Hi. Um, yeah. The unnies said you'd teach me?"

He chuckled, settling on the couch beside Haewon, who immediately draped an arm over his shoulders. "Teach you? Sounds fun. What are we starting with?"

The conversation flowed from there, the four of them squeezed into the living room. He shared stories from his perspective—how he felt lucky to have three amazing girls, how he loved the no-strings vibe. Kyujin asked questions, hesitant at first but growing bolder: What does it feel like? Does it hurt? How do you know if you're doing it right?

Haewon and Lily tag-teamed answers, demonstrating with innocent touches—how to kiss deeply, the spot on the neck that makes someone shiver. He joined in, his hand gently on Kyujin's arm, explaining consent and pace. The air thickened slowly, laughter mixing with lingering glances. Snacks forgotten, the talk turned more intimate, bodies shifting closer on the couch.

In the next room, the door cracked just enough. Sullyoon lay on her bed, pretending to scroll on her phone, but her ears strained toward the living room. Bae was beside her, under the covers, whispering, "You think they're really gonna do this? Kyujin's so innocent." Sullyoon shushed her, a hand slipping under her own waistband, curiosity burning.

Sullyoon bit her lip, her fingers dipping lower, tracing the edge of her panties as the voices from the living room grew a little louder, a mix of giggles and murmurs that hinted at something more intimate unfolding. Bae shifted beside her, her own hand mirroring Sullyoon's movements under the blanket, both of them frozen in place, not wanting to miss a single sound. The air in their room felt thick, charged with that forbidden thrill of eavesdropping on their members' private moment.

Back in the living room, the tension had simmered to a boil. Haewon and Lily had maneuvered themselves onto his lap, one on each thigh, their bodies pressing close as they sandwiched him between their warmth. Kyujin sat on the floor in front of them, her knees drawn up, watching with wide eyes that flickered between nervousness and raw fascination. He leaned back against the couch, his jeans already undone, that thick cock of his standing proud and heavy against his stomach, veins pulsing from the earlier teasing touches.

"Look at this beauty," Haewon purred, her hand wrapping around the base, giving it a slow, firm squeeze that made him hiss through his teeth. She glanced at Kyujin, her smile wicked but encouraging. "You see how it twitches? That's because he's dying for us to take care of it. We're gonna show you how to make it sloppy, messy, the way he loves it. Makes everything feel so much better when you get to the fucking."

Lily nodded, leaning in to press her lips to the side of his neck, nipping lightly as she reached down to join Haewon's hand. "Yeah, unnie's right. Start with lots of spit. Gets it all slick and shiny, easy to slide down your throat." She pursed her lips and let a thick glob of saliva drop onto the head, watching it trickle down the shaft. Haewon followed suit, spitting right onto the middle, their combined wetness making the skin glisten under the low light.

He groaned, his hands settling on their hips, fingers digging in just enough to urge them on. "Fuck, girls, you're killing me already. Keep going”

Haewon took the first turn, her mouth hovering over the tip before she descended, lips parting wide to engulf the head. She sucked hard, tongue swirling around the ridge, then pushed down further, taking half his length in one smooth motion. Her cheeks hollowed as she bobbed, pulling back with a wet pop, strings of spit connecting her lips to his cock. "Like that," she said breathlessly, wiping her mouth with the back of her hand. "Suck and slurp—make those noises he goes crazy for."

Lily wasted no time, grabbing the base to angle it toward her. She spat again, more aggressively this time, the saliva splattering across the shaft before she dove in. Her throat relaxed as she deepthroated him, nose brushing his pubic bone, gagging just a little for that extra vibration. She held it there, humming low, before pulling up slowly, coughing up more spit that dripped onto his balls. "Mmm, feel how it throbs when you go all the way? That's your cue to keep going. Alternate—fast and shallow, then deep and slow."

Kyujin leaned closer, her breath coming in short bursts, one hand unconsciously pressing against her own thigh. "It looks... intense. Does it taste good?"

Haewon laughed softly, stroking him lazily while Lily caught her breath. "Tastes like him—salty, musky, addictive. You'll see. Watch us a bit more, then you jump in. No rush, but trust me, once you start, you won't want to stop."

They kept at it, trading off seamlessly. Haewon would deepthroat with quick, aggressive thrusts of her head, her free hand cupping his balls and rolling them gently, spit flying everywhere—dripping down her chin, soaking his thighs. "Hear that?" she mumbled around him, the words garbled but clear enough. "Sloppy sounds mean you're doing it right. He loves when it's messy like this." Lily took over next, slower and more teasing, licking from base to tip in long, flat strokes before swallowing him whole again, her gag reflex barely kicking in as she worked her throat muscles to massage the head.

He was breathing heavier now, hips bucking up involuntarily, chasing the heat of their mouths. "Shit, you two are pros. Kyujin, come on—give it a try. I wanna feel those pretty lips."

Kyujin hesitated for just a second, then crawled forward on her knees, her face flushing hot. Haewon and Lily made space, Lily guiding her hand to the slick shaft. "Start easy. Just kiss it first—soft, like you're saying hello to your favorite toy."

Kyujin nodded, leaning in to press her lips to the tip, a tentative peck that turned into another, then another. Her kisses grew bolder, open-mouthed, tongue darting out to taste the mix of their spit and his precum. "It's... warm," she whispered, kissing along the underside, feeling it pulse against her mouth. "And so hard. I like it."

"Good girl," he rumbled, his voice strained. "Keep going—take a little more."

She parted her lips wider, sliding the head inside, sucking gently as her tongue explored. Inch by inch, she took him deeper, her mouth stretching around the girth, eyes watering slightly as she pushed past the halfway point. Haewon watched closely, then reached out, fingers tangling in Kyujin's hair—not pulling hard, but firm enough to guide. "Relax your throat, maknae. Breathe through your nose. Like this—tilt your head a bit, let it slide in." She eased Kyujin's head down, helping her take more, until the head bumped the back of her throat.

Kyujin gagged, pulling back with a cough, but she grinned through the tears in her eyes. "Whoa... that was deep. Try again?"

"Hell yeah," Lily encouraged, spitting on the cock again to keep it lubed. "You're getting it. Unnie, show her the grip—hold the base if it's too much at first."

Haewon nodded, demonstrating on herself first by taking him deep once more, then handing off. With her hand in Kyujin's hair, she coached her through it—slow pushes, pauses to swallow, building rhythm. Kyujin got the hang of it fast, bobbing with increasing confidence, her slurps joining the chorus of wet sounds filling the room. The three of them rotated now, mouths and hands everywhere: Haewon deepthroating while Lily licked his balls, Kyujin kissing the shaft, spit pooling on the floor beneath them.

In the next room, Sullyoon's fingers moved faster, dipping inside herself as she imagined the scene, the gagging noises carrying through the wall like a soundtrack. Bae was right there with her, thighs clenched around her hand, whispering, "They're sucking him off... fuck, I bet it's huge. Listen to that slurping."

He was close—his groans turning guttural, cock swelling in their mouths. "Gonna cum soon... don't stop—"

But they did, pulling back in unison, leaving him throbbing and desperate, strings of saliva dangling from their lips. Lily licked hers clean, eyes locked on his. "Not yet, oppa. I want to go first. Need that big dick inside me now." She stood, grabbing his hand, then glanced at the others. "Come on—our room. More space, and the bed's perfect."

They followed her down the short hallway, past the cracked door where Sullyoon and Bae froze, hands stilling for a moment before resuming in frantic circles. Lily pushed open the door to the shared bedroom she had with Haewon—posters on the walls, clothes scattered, the queen bed unmade and inviting. She stripped quickly, peeling off her top and shorts, her body slim and toned from endless practices, nipples already hard from the earlier activities

"Get on the bed," he said, voice rough, shedding the rest of his clothes as he followed. Lily climbed on, lying back against the pillows, legs spreading wide to reveal her pink swollen pussy, lips puffy and slick with arousal. She beckoned him with a finger, her Australian accent thickening with lust. "Come here. I want you to fill me up—slide that thick cock right into my wet pussy."

He crawled over her, positioning himself between her thighs, the head of his dick nudging her entrance. Kyujin and Haewon settled on the bed beside them, watching intently, their own hands wandering—Haewon's over her breasts, Kyujin's between her legs tentatively. He pushed in slowly, the stretch making Lily arch her back, a long moan escaping her. "Oh fuck, yes... so big, stretching me wide. Deeper, oppa—give it all to me."

She wrapped her legs around his waist, ankles locking tight, heels digging into his ass to pull him in further. He bottomed out, grinding against her clit, her walls clenching greedily around him. "Like that? You feel so tight, Lily—gripping me like you never want me out."

"Never," she gasped, rocking her hips up to meet his first thrust. He started moving, slow at first, pulling out almost all the way before slamming back in, the bed creaking under them. Her legs held him close, forcing every stroke to be deep, hitting that spot inside her that made her toes curl. "Harder... fuck me like you own this pussy."