Chapter 15: Three to an A+
The hum of the wand faded into a ringing silence, broken only by Joan’s ragged breathing. The air in the booth felt charged, thick with the heat Jeonghan had summoned from her body. His smirk was a brand.
Before either could speak, the curtain swished aside.
Professor Nam stood there, her silver bob impeccable, her tablet held against her chest. Her eyes, sharp as surgical steel, moved from the discarded wand to Joan’s flushed face, to Jeonghan’s composed, challenging posture.
“Adequate mapping, Mr. Yoon,” she said, her tone devoid of praise or criticism. It was a statement of observable fact. “Your partner’s physiological responses were clear. Elevated heart rate, vasocongestion apparent in the facial flush and nipple erection through clothing, involuntary pelvic thrust.” She glanced at her tablet. “Mr. Kim’s work at station four was also flawlessly executed. His partner achieved a textbook clitoral orgasm in three minutes forty-two seconds.”
Mingyu. Joan’s mind, still fogged with unmet need, latched onto the name. A strange, sharp twist coiled in her stomach—not jealousy, something closer to competitive frustration.
Professor Nam’s gaze settled on Joan. “You are responsive. Both to targeted stimulus and,” a pause, “to psychological pressure. A valuable combination. The two of you are sufficiently prepared for the next practical assessment.”
Jeonghan’s eyebrow quirked. “Assessment?”
“A cumulative skill demonstration. Mr. Kim!” Professor Nam called, her voice cutting through the low murmur of the other booths. A moment later, Mingyu appeared behind her, his tall frame filling the entry. His eyes darted to Joan, taking in her disheveled state, the high color on her cheeks, then to Jeonghan. His friendly face tightened.
“You will work as a triad,” Professor Nam stated, stepping fully into the booth and letting the curtain fall closed. The space suddenly felt impossibly small. “The objective: demonstrate sustained, multi-orgasmic response in your female partner using combined manual and augmentative technique. You must induce and document three distinct climaxes, with no more than ninety seconds between peaks. Succeed, and all three receive an automatic A for the midterm examination. Fail, and you will repeat the unit with a fifty-percent grade penalty.”
Mingyu blanched. “Professor, that’s—”
“The curriculum,” she interrupted. “This academy produces experts, not timid enthusiasts. You will apply what you have learned. Mr. Kim, you possess technical precision. Mr. Yoon, you exhibit a… proficient understanding of psychological impetus. Combine your skills.” She moved to the corner of the booth, leaning against the mirrored wall. She tapped her tablet. “Proceed. I am here to observe and grade methodology only.”
A cold wave of disbelief washed over Joan. This was no longer a lesson. It was a dissection. The clinical light, the mirrors, the professor’s detached gaze—it turned her body into a live specimen. Her earlier thrill curdled into something hard and defensive.
“Joan.” Mingyu’s voice was low, strained. “You don’t have to—”
“She does,” Professor Nam said flatly. “Consent was granted for the semester’s practical modules upon enrollment. This is within scope. Proceed, or forfeit.”
Jeonghan watched Joan, his earlier playfulness gone, replaced by an intense, calculating focus. He understood the stakes were no longer just grades; it was a test of dominance, of skill, of her very control. “Well,” he said, his voice deceptively light. “We wouldn’t want to fail, would we?”
Joan met his gaze. A spark of defiance ignited in her gut, cutting through the humiliation. She would not be a passive subject. If this was happening, she would own it. She held Jeonghan’s eyes as she reached for the hem of her shirt.
She pulled it over her head, letting it drop to the floor. The cool air pebbled her skin. Her breasts felt heavy, her nipples tight and sensitive. Her fingers went to the button of her jeans.
Mingyu sucked in a breath, looking away for a second before forcing his eyes back, his jaw rigid. This was his best friend. This was a clinical assessment. The two facts warred in his head, but the professor’s presence was an inescapable cage.
Joan pushed her jeans and underwear down her legs, kicking them aside. She stood naked before the three of them, her chin lifted. The mirrors reflected her from endless angles—the curve of her spine, the tremble in her thighs, the defiant set of her mouth.
“On the table,” Professor Nam instructed.
Joan climbed onto the padded leather, lying back. The surface was cool against her heated skin. She focused on the ceiling, on a small, faint crack in the acoustic tile.
“Begin.”
For a long moment, nothing happened. Then Mingyu moved. He picked up the wand from where Jeonghan had left it, his hand steady now. He switched it on. The low, familiar hum filled the booth, a vibration Joan felt in her teeth.
“I’ve got you,” Mingyu whispered, the words meant only for her. His touch was gentle as he pressed the humming head against her inner thigh, retracing the mapped zone. But this was different. There was no denim barrier. The silicone buzzed directly against her skin, a deep, shocking thrum that made her jump.
Jeonghan’s hands joined then, cool and sure. He didn’t look at her face. His attention was entirely on her cunt. He used his thumbs to spread her folds, exposing her completely to the light, to their view. His touch was clinical, invasive. “Very responsive,” he murmured, more to himself than anyone.
“Combine your efforts,” Professor Nam said from the corner. “Do not work in sequence. Overlap stimulation.”
Mingyu guided the wand higher, the pressure firming. At the same time, Jeonghan’s index finger pushed inside her, a slow, curling invasion. Joan gasped. The dual sensation was immediate and overwhelming—the broad, insistent vibration against her clit and the precise, stroking pressure inside her. Her hips rolled off the table, seeking more.
“Good,” Jeonghan noted, his voice detached. He added a second finger, scissoring them, stretching her. He pumped in a steady rhythm, his knuckles brushing against Mingyu’s wrist where he held the wand. The intimacy of their hands so close, working on her, was almost more shocking than the physical feeling.
The orgasm built not like a wave, but like a wire pulled taut. It was sharp, electric, a product of efficient engineering. Mingyu saw the signs—the flutter of her inner muscles around Jeonghan’s fingers, the sharp cry catching in her throat. He increased the wand’s speed.
It crashed through her. Her back arched violently, a raw, guttural sound tearing from her lips as the pleasure detonated, radiating out from her core in blinding, white-hot pulses. Her vision swam. Jeonghan kept his fingers moving inside her, prolonging the spasms until she was sobbing for breath.
“Climax one,” Professor Nam intoned. “Time it.”
Jeonghan withdrew his slick fingers. Mingyu pulled the wand away, his own breathing heavy. He looked down at Joan, her body glistening with sweat, trembling. A protectiveness so fierce it hurt surged in him. This was wrong.
“Ninety-second window,” the professor reminded them. “Continue.”
Before Joan could even come down, Jeonghan was on her. His mouth, shockingly soft and warm, covered her clit. He sucked, hard, his tongue lashing the swollen bud. Joan screamed, her hands flying to his hair, not to push him away but to clutch something, anything, as a second, more terrifying peak immediately began to crest.
Mingyu stared, stunned, his grip on the wand slackening.
“The augmentative, Mr. Kim!” Professor Nam snapped.
Jolted, Mingyu fumbled with the wand. He couldn’t place it where Jeonghan’s mouth was. Instead, he pressed it firmly against her perineum, the powerful vibrations transferring through the thin tissue to her already over-sensitized core.
The effect was catastrophic. Jeonghan’s mouth was ruthless, sucking and biting with a precision that felt malicious in its pleasure. Mingyu’s wand sent shockwaves through her from below. Joan shattered again. This climax was wet, a gush of hot fluid spilling out of her, soaking the pad beneath her and Jeonghan’s chin. Her body convulsed, legs locking around Jeonghan’s head. He didn’t let up, drinking from her until her screams died into broken whimpers.
“Climax two. Adequate fluid emission.” The professor’s voice was a distant drone. “Prepare for the third. The most difficult. The refractory period is now the enemy.”
Jeonghan pulled back, his lips wet and shining. He looked utterly composed, save for the dark hunger in his eyes. Mingyu looked sick, his knuckles white on the wand.
Joan was a wreck. Spent, oversensitive, raw. Every nerve ending screamed. The thought of a third was a form of torture. Tears leaked from the corners of her eyes.
Jeonghan leaned close, his mouth at her ear. His whisper was a venomous caress. “You can take it. I know you can. Don’t you want to beat me?”
That spark of defiance flared again, cutting through the exhaustion. She blinked the tears away, meeting his gaze. She gave a single, shaky nod.
“Mingyu,” Jeonghan commanded, shifting his body. “The wand. On her clit. Full power. Don’t stop for anything.” He positioned himself between her legs, his hands gripping her hips. He wasn’t using his fingers this time.
Understanding dawned on Mingyu’s face, followed by a storm of conflict. He looked at Joan. Her eyes were on his, pleading and fierce all at once. Do it.
With a ragged breath, Mingyu positioned the humming head directly on her exposed, swollen clit and pressed down.
The sensation was so intense it bordered on pain. Joan cried out, her body trying to buck away, but Jeonghan held her hips immobile. Then she felt the blunt, hot head of his cock press against her soaked entrance. He wasn’t gentle. He pushed into her with one relentless thrust, filling her in a single, brutal stroke.
“Fuck!” she gasped, the stretch, the fullness, the relentless vibration combining into a sensory overload that short-circuited her brain.
Jeonghan began to fuck her in deep, punishing plunges. Each thrust drove the wand harder against her clit. Mingyu held it in place, his face a mask of anguish and arousal, watching his best friend being ravaged by his rival, his own cock straining painfully against his jeans.
The booth filled with the sounds of slapping skin, the electronic buzz, and Joan’s ragged, continuous moans. The mirrors reflected the scene endlessly: Mingyu’s tense shoulders, Jeonghan’s controlled, driving hips, Joan’s legs wrapped around Jeonghan’s waist, her head thrashing.
Jeonghan’s composure finally broke. “Come on, you bitch,” he grunted, his pace becoming frantic. “Come for us. One more. Squirt all over his perfect fucking hand.”
The crude command, the possession in “us,” the sheer, debasing reality of it tipped her over the edge. The third orgasm was a convulsive, mind-wiping event. It felt less like pleasure and more like a system failure. Her cunt clamped down on Jeonghan’s cock in violent, rhythmic pulses as another hot flood released from her, soaking Mingyu’s hand and the wand. A hoarse, broken scream was torn from her throat.
Jeonghan followed her over, pulling out her with a choked groan, his own release spilling all over her exposed stomach. He collapsed on top of her, his weight pinning her to the table.
Silence, save for panting.
Professor Nam tapped her tablet. “Climax three. Within parameters. Demonstration successful.” She looked at the three of them—Joan blank and trembling beneath Jeonghan, Mingyu staring at his slick hand in horror, Jeonghan spent and buried inside her. “A for the midterm. You may clean up.”
The professor’s footsteps receded behind the curtain.
For a long moment, the only sound was the ragged symphony of their breathing. Jeonghan rolled off Joan, his body separating from hers with a wet, soft sound. The cool air hit the mess on her stomach. Mingyu stood frozen, the wand still buzzing impotently in his hand until he fumbled to switch it off. The sudden silence was heavier than the noise.
Joan pushed herself up onto her elbows, her muscles trembling with spent violence. She looked at Mingyu’s shell-shocked face, then at Jeonghan, who was wiping his cock with detached efficiency. A strange, hollow calm settled over her. The performance was over. The grade was secured. But the clinical absurdity of it all, the way their bodies had been mere tools, ignited a cold, defiant spark.
“Professor Nam?”
The curtain halted its swing. Professor Nam stepped back into view, her expression one of mild academic inquiry. “Yes?”
Joan’s voice found a brittle steadiness. “Since we’ve covered the female refractory period and multi-orgasmic response so… thoroughly,” she began, ignoring the way Mingyu’s eyes widened, “I was wondering about the advanced curriculum.” She sat up fully, not bothering to cover herself. “Do we ever train with male toys? Fleshlights, for instance. Understanding anatomical replicas seems logically consistent with the program’s ethos.”
The professor’s perfectly shaped brows lifted a millimeter. A flicker of something—interest, perhaps—crossed her impassive face. She was young, early thirties at most, her beauty sharp and unsettlingly preserved. In her tailored lab coat, she could have been a senior student, a terrifyingly competent one.
“An astute query,” Professor Nam said after a considering pause. “Practical application on consenting subjects is always superior to silicone. However, for techniqueproofing…” She nodded once, decisive. “Retrieve the demonstration case from the cabinet. Units three and seven.”
Jeonghan moved first, a lazy smirk playing on his lips as he fastened his jeans. He shot Joan a look that was equal parts admiration and predatory curiosity. “Always full of surprises.”
Mingyu finally seemed to reboot. “Joan, what are you—”
“We got an A, Mingyu,” Joan said, her eyes never leaving the professor. “Might as well go for the plus.”
Jeonghan returned with two sleek, black cases. He handed one to Joan, his fingers brushing hers. “Ladies first.”
Professor Nam took the other case. “We will demonstrate concurrently. Jo, you will work on Mr. Kim. I will instruct Mr. Yoon.” She placed her case on a clean section of the padded table, clicking it open to reveal a realistic fleshlight nestled in grey foam. “The objective is not simply penetration. It is about angle, pressure variance, and reading physiological cues even without direct skin contact. Observe.”
Jeonghan was already unbuckling his belt again, his earlier exhaustion seemingly forgotten. The professor’s proximity, her clinical authority, seemed to act on him like a drug. His pupils were dilated as he pushed his trousers down, his erection already thick and eager. “Eager to learn, Professor,” he said, his voice a low tease.
“Your enthusiasm is noted,” she replied, her tone dry as dust. She removed the sleeve, pouring a generous amount of clear lubricant into it. Her movements were economical, precise. “Assume the position, Mr. Yoon. Stand here.”
Jeonghan moved to where she pointed, his back to the mirrored wall. Professor Nam knelt before him, a sight so blasphemous it stole the air from the room. She wasn’t a woman kneeling; she was a scientist preparing a specimen.
“Joan,” the professor said, without looking away from Jeonghan’s cock. “Begin. Observe his initial state. Document the pre-stimulus tremor.”
Joan turned, forcing her focus onto Mingyu. His face was a war zone of conflict. “You don’t have to do this,” he mumbled, even as his body betrayed him, reacting to the sheer surreal intensity of the scene.
“I want to,” Joan said, and found she meant it. This was control, of a sort. She opened her case, her fingers steady as she prepared the lubricated sleeve. “Stand like he is.”
Mingyu obeyed, shuffling into place. His cock was half-hard, confused. Joan knelt. The perspective was jarring—the intimacy of the act clashing violently with the sterile environment and their audience. She guided him into the tight, ribbed silicone.
“Use your hand to create a seal at the base,” Professor Nam instructed from her side of the booth. She was doing the same to Jeonghan, her slender fingers encircling him where he met the toy. “Now, a slow corkscrew motion. Focus on the frenulum with each upward pass.”
Joan mirrored the motion on Mingyu. The artificial channel was intensely realistic, warm from the lube. Mingyu gasped, his head thudding back against the mirror. “Fuck, Joan.”
“Note the verbal response,” Professor Nam commented. She was working Jeonghan with a mesmerizing, rhythmic expertise, her wrist twisting deftly. “A sign of effective targeting.” But her own breathing had changed, a subtle sharpness to each inhale. Her free hand, previously resting on her knee, drifted to the front of her tailored trousers.
Jeonghan’s eyes, dark and heavy-lidded, watched her hand move. “Getting involved, Professor?”
“Observing tactile feedback is essential,” she said, but her voice had gained a faint, breathy edge. Her fingers undid her button, slid her zipper down. She dipped her hand into her own trousers, her face a mask of intense concentration as she worked Jeonghan with one hand and herself with the other. The wet, soft sound of her fingers moving in her own cunt joined the slick, rhythmic noises from the toys.
The voyeuristic charge in the booth became a physical thing, thick enough to taste. Mingyu was fully hard now, pistonating into the sleeve Joan held, his earlier reluctance incinerated by the raw spectacle. He watched, transfixed, as the esteemed Professor Nam fingered herself while expertly jacking off their most arrogant rival.
“He’s close,” Joan said, feeling Mingyu’s muscles coil.
“Switch to rapid, shallow strokes,” Professor Nam commanded, her own motions becoming more urgent. Her hips rocked slightly against her own hand. “Bring him to the edge, then stop.”
Joan did, and Mingyu groaned, his whole body tensing. “Don’t stop, please—”
But she stopped. Across from her, the professor did the same to a visibly trembling Jeonghan.
“Now,” the professor panted, her composure cracking to reveal a stark, hungry arousal beneath. “Direct insertion. Full depth. No toys.”
She didn’t need to say it twice. In one fluid motion, she withdrew her hands, yanked her trousers down further, and turned, bracing herself against the demonstration table. Jeonghan was on her in a heartbeat. He didn’t guide himself in. He slammed into her, the full, brutal length of him burying itself in her with a wet, meaty sound that echoed off the mirrors.
“Oh god,” Mingyu whispered, the sight short-circuiting his last thread of restraint. He pulled himself from the fleshlight in Joan’s hand, his need raw and immediate. “Joan.”
The understanding passed between them, clean and simple. Joan turned, leaning forward over the same padded leather still damp from her own fluids. Mingyu’s hands gripped her hips, and he entered her from behind in one deep, claiming thrust. It was different from Jeonghan’s calculated pounding. This was desperate, grateful, fraught with a friendship now irrevocably altered.
The booth was a cacophony of flesh. The smack of skin, Jeonghan’s guttural grunts as he drove into the professor, Mingyu’s choked sobs against Joan’s back, the obscene, wet squelch of two couples fucking with furious abandon. Professor Nam’s cries were sharp, professional decorum shattered into a thousand greedy pieces. “Yes, just there, harder, document that—”
It was a race without a finish line, a grotesque parody of their earlier assessment. Jeonghan came first, a ragged shout into the professor’s neck as he emptied himself inside her. The sight, the sound, tipped Mingyu over. He cried out Joan’s name, his thrusts turning irregular as he pulsed within her, his body collapsing heavily onto her back.
They slumped in a heap of limbs and sweat and spent sensation. The air reeked of sex and disinfectant.
Professor Nam gently disengaged from Jeonghan. She pulled her trousers up, her hands trembling only slightly. She walked to her tablet, which had been propped against the wall, recording the entire encounter. She tapped the screen.
“Adequate,” she breathed, a sheen of sweat on her upper lip. “More than adequate. Technical execution under heightened stimulus… remarkable.” She changed their grade on the tablet with a decisive swipe. “A+. For all three. The midterm is concluded.”
She gathered her case, smoothed her silver hair, and without another word, swept the curtain aside and was gone.
Silence descended, profound and total.
Then, a disbelieving snort came from Jeonghan. It bubbled into a low chuckle. Mingyu, still buried inside Joan, lifted his head and let out a shaky laugh. Joan, her face pressed against the cool leather, began to laugh too, a breathless, almost hysterical sound that shook through her exhausted body.
Mingyu pulled out, helping her turn to sit upright. They were a mess—covered in each other, in the evidence of the professor’s participation, in the sheer insanity of it.
Jeonghan, tucking himself away, caught Joan’s eye. A slow, real smile spread across his face, devoid of its usual malice. He raised his hand, palm open.
Mingyu stared at it, then at Joan. A grin broke through his dazed expression. He high-fived Jeonghan’s hand with a solid slap.
Joan reached up, her palm connecting with theirs in a sticky, triumphant smack. The sound was crude, final, and perfect.
They had won.