The Junior's Mistake
"Are you okay?! What happened!"
"..."
Park Seongchan rushed toward the source of the sound, and the scene that greeted him was this: Yoon Seoyeon sat sprawled on the floor where she'd fallen hard on her rear, fingers barely clinging to a specimen flask she had nearly dropped.
Her head was bowed, so he couldn't read her face clearly, but the way she'd collapsed looked as if the strength had simply gone out of her legs.
She must have been really startled.
Even at a glance, the hand gripping the specimen was trembling.
"Are you hurt anywhere? Just give me the specimen for now, Seoyeon."
Things had grown a little awkward between them after the undressing incident with his junior the day before, but Seongchan didn't act any differently from usual. Besides, thanks to an administrative error, Ayeong—who should have gone home after her overnight shift—was still on duty. So Seongchan had pulled himself free under the pretext of work support, all for his pitiful junior's sake. That was why he had only assigned her light tasks like specimen delivery.
But maybe it was because she had pulled an all-nighter. Looking at his junior's even more startled expression, and the way her hands shook over something as light as a specimen flask, Seongchan thought,
She's got every right to be exhausted.
He gently reached out and took the precariously swaying flask from her hands. Seoyeon, however, clutched the specimen tighter with her trembling fingers and refused.
"Ah… no, it's fine, Senior."
"Come on. You barely slept, you got startled, and your hands are shaking. Here."
When Seongchan held his hand out again, she hesitated for a moment, then passed him the specimen with trembling fingers.
"Thank you… Senior…"
And then it happened.
Thump.
The sweat that had gathered on her hands from the fall and the tension—because of that sweat, the specimen slipped between her fingers and arced through the air.
"Huh…?"
Seeing his junior's utterly panicked face, Seongchan called out,
"Seoyeon, just let it break—"
He could say that because he knew the drug was only in Phase II clinical trials; even if a small amount got on someone's body, it wouldn't be a serious problem. So even if it shattered, they could just clean it up and fetch another one—he had meant to tell her to leave it. But she didn't know that.
"No!"
And the reason she couldn't make a proper judgment, unlike usual, was her lack of sleep—compounded by the words she had overheard the moment she stepped into the specimen lab.
—I wonder if they already stamped the marriage registration…
That remark, working in synergy with her exhaustion, pushed her into something she never would have done under normal circumstances. And that line had hit her with lethal force. Of course it had.
I waited six years just listening to what Senior said, waiting for Ayeong to stand on her own…
She had been smitten with Park Seongchan from the day she joined the institute. But with him already looking overwhelmed just raising his stepdaughter Ayeong, she had decided that confessing would be a terrible thing to do to him—so she had quietly resolved to wait until Ayeong was independent. And the result of that waiting?
From the way Senior usually talks, I never even realized they were… that kind of close…
His daughter Ayeong had gone and gotten into Hanam University. In an instant, Seoyeon had become the dog that had chased the chicken only to lose it. But yesterday, she had seen a glimmer of hope—last night, when Park Seongchan had stared blankly as she changed clothes.
Maybe I… have a chance too? Even if it's after Ayeong…
After that incident, she had been holding onto hope for at least second place, if not first. But the timing had been terrible. The single phrase that had lodged in Yoon Seoyeon's ears the moment she walked in was Kim Taeyang's mention of a "marriage registration."
If it's a marriage registration… then even second place is out.
The shock of that realization had dropped her straight to the floor. One incident piled on top of another until she couldn't think straight, and she did something she never would have done otherwise.
Making a stupid mistake like this…
She tried to catch the specimen as it fell toward the floor. And because of that, what should have simply shattered on the ground ballooned into something far worse.
Crash!
Perhaps because she had lunged so desperately to grab the falling flask, Seoyeon's force-laden motion only drove it harder into the floor. With a sharp, shattering crack, the sturdy flask smashed against the ground and broke into pieces. And from between the shards of the destroyed flask, the viscous liquid inside sprayed in every direction.
And of all people, Park Seongchan—who had been speaking with his mouth open, warning Seoyeon—took a single, perfectly aimed drop of the potion straight into his mouth.
Gulp.
He swallowed the potion that had entered his mouth on pure reflex. Between the two of them, frozen by the sudden turn of events, a suffocating silence settled.
"..."
"..."
A few seconds later, once they grasped the situation, the two of them started talking in alarm.
"Huh?"
"S-Senior! Are you all right?"
Yoon Seoyeon's face twisted with panic at the fact that her mistake had made her senior ingest the potion.
"I'm fine. It's not an overdose—just one drop. And this potion only works if you drink a whole flask of it, so…"
Seongchan answered with forced calm, trying to soothe his panicking junior. With the mountain of experimental data he held, he judged that a trace amount this small couldn't possibly affect the body.
But there was one fatal fact he had overlooked: his body was the body of a Breeding Uncle.
The potion Park Seongchan had swallowed was the project he and Kim Taeyang had been working on recently—the Sensitivity 20x Aphrodisiac. This specialized aphrodisiac was manufactured by processing the semen of patients with Acute Semen Retention Necrosis Syndrome. In the late stages of the disease—where suppressed ejaculation left semen trapped and rotting inside the testes—the concentration of hormones that stimulated the sensory nerves could spike by as much as 30,000% relative to a normal person. The critical point was that the aphrodisiac used that hormone-concentration factor unique to people with the necrosis syndrome. In short, this aphrodisiac could be considered a libido amplifier.
And now, even if only a trace amount, that aphrodisiac had been introduced into Park Seongchan—who was already forcibly suppressing an abnormally powerful sexual drive thanks to his special Breeding Uncle constitution.
The result…
Thump.
Thump-thump.
"Huh…?"
His heartbeat, which at first had felt completely normal, began to grow louder.
"Ghhhk…!"
The breeding instinct he had been holding down with iron patience came roaring back to life from a single drop of aphrodisiac, and his body plunged into a state of heat.
"Senior! Senior!! Are you okay?"
The junior in front of him grabbed his shoulders in terror at his sudden change and asked after him, but he had no room left to answer. A buzzing filled his ears as his vision rapidly blurred, and the auditory hallucinations started up again.
—This is a perfect situation. You can just punish your junior.
His hated, heat-maddened body, empowered by the aphrodisiac, was rearing its head once more.
"Seoyeon… get away from me… quickly…"
Seongchan sensed this was a clear danger signal and wrung out every scrap of reason to push her away—but Yoon Seoyeon, who had no idea what was happening, only clung to him as he collapsed toward her chest in pain, sniffling apologies.
"I-I mean… so… I'm sorry…"
"That doesn't… matter… just get away…"
Because of Yoon Seoyeon's trembling movements, her large breasts ended up rubbing against Park Seongchan's face—and for Seongchan, who normally would have endured through sheer willpower, the limit arrived at once.
—It's not your fault. You have to punish a junior who made a mistake. In a situation like this, she'll have no choice but to accept it.
"Sh…ut up…"
It was a rough curse spat at the hallucination in his head, but Yoon Seoyeon only thought he was saying it to her. Already exhausted and unable to judge the situation properly, she completely lost it when the senior who had never once sworn in front of her suddenly spat out a curse.
"I'm sorry… I'm so sorr…"
With her head bowed deep and her body shaking in terror, her heavy breasts naturally dropped toward Park Seongchan's face—and the result was the worst possible situation, with Yoon Seoyeon's chest pressing even harder against him.
"Ghhhk!"
Already at his limit, Park Seongchan began to convulse. That was when the relief pitcher arrived.
"What's going on!"
Kim Taeyang, drawn by the commotion, looked back and forth between Park Seongchan thrashing violently, Yoon Seoyeon frozen in panic, and the shattered flask on the floor. With a veteran's eye, he grasped the situation in an instant and shouted firmly,
"Chemical exposure to a human body has occurred!!"
But Yoon Seoyeon only stood there dazed, not knowing what to do. Kim Taeyang charged over at once, roughly pulled Park Seongchan off her, and shouted again.
"Researcher Yoon Seoyeon! Pull yourself together! Report the current situation immediately!"
"Uh… uh… well…"
"Hey! Are you going to snap out of it or not?! Report!"
"It's… I mean… I… I fell on the floor for a second, and then…"
Kim Taeyang seized the shoulders of the rambling, flustered Yoon Seoyeon hard. Meeting her eyes dead-on, he pressed her urgently.
"Just the essentials! What potion, and how much!"
"S-Sensitivity 20x… one drop's worth…"
At the words "one drop," Kim Taeyang almost let out a sigh of relief—until he checked Park Seongchan's lower half, swollen to the point of nearly tearing through his pants, and recoiled in horror.
"Are you sure it was really one drop? Looking at this, it's exactly the same as when we overdosed the animals in the experiments!"
"N-No! It's true! It was one drop!"
"Then why is he like this? It's just like a necrosis syndrome seizure…"
As the words left his mouth, the worst hypothesis struck Kim Taeyang's mind like a lightning bolt. It matched perfectly with the form of the fatal hypersensitivity reaction that had appeared in early-stage necrosis syndrome patients during clinical trials.
"Could it be early-stage necrosis syndrome?"
"What…? S-Senior has that?"
"There's no other way one drop would cause this kind of chaos! You know what we make this drug from!"
"Then… no way…"
A thirty-minute stopwatch floated up in both of their minds. The golden time for necrosis syndrome was thirty minutes. If they didn't respond within that window, the testes would necrotize and he would die. Precious time was already slipping away. And the only treatment for this necrosis syndrome was to keep ejaculating so that necrosis wouldn't set in. But right now, Park Seongchan had lost consciousness from the seizure.
Kim Taeyang looked at Yoon Seoyeon with a grim face.
"The neutralizer is in another sector, so it'll take time to go get it. And even if we administer the neutralizer, it doesn't neutralize instantly. It takes a while."
They both looked at the convulsing Park Seongchan, then exchanged glances in the heavy silence. The same conclusion flashed through the eyes that met, and the two of them nodded with set faces.
"Then there's only one way."
"Then there's only one way, isn't there."
A brief silence. A few seconds later, Yoon Seoyeon, her cheeks flushed, spoke first.
"I'll do it, Senior Taeyang."
"…You going to be okay?"
"There's no choice. It was my accident, and more than anything, having two men handle that kind of treatment—neither you nor Senior Seongchan would…"
"…You're right. Haa… Fine. I'm sorry, but I'm counting on you."
"It's an emergency, after all…"
Blushing but moving quickly, Yoon Seoyeon reached for Park Seongchan's waistband. Seeing that, Kim Taeyang immediately turned his head, bolted for the doorway, and called back,
"I'll call the safety management team and bring the neutralizer! So… just… hang in there a little. Once we get the neutralizer in him, it should calm down somehow."
"Yes. And… when you bring the neutralizer, just tell me once. I'll administer it myself."
"Got it! Keep checking whether the symptoms are getting worse in the meantime and report!"
"Yes!"
Kim Taeyang's hurried footsteps faded down the corridor, and only Park Seongchan's ragged breathing and Yoon Seoyeon remained in the specimen lab. Seoyeon bit her lip hard against the guilt surging up inside her.
"Senior. I'm sorry. Ayeong… I'm sorry…"
But this was…
It was my mistake, but…
To save her senior, she had to do it right now… so there was no choice…
"This is… a rescue act to save Senior…"
Hypnotizing herself, she reached for his waistband and pulled down the zipper.
"It won't open easily…"
Park Seongchan's lower half had swollen so abnormally that the zipper was jammed tight, ready to burst. With trembling fingers, Seoyeon pressed hard and managed to drag the zipper down.
Gulp.
Along with the sound of her swallowing, Park Seongchan's pants finally slid down. The massive, heavy silhouette that showed without any concealment even through a single thin layer of boxer briefs made Yoon Seoyeon's mind go blank for a moment—but she roughly shook her head.
"Get a grip. Every second counts."
Slapping her flushed cheeks to hold onto her reason, Yoon Seoyeon carefully brought her trembling hands to either side of Park Seongchan's hips to peel away the last barrier.