Tenfold
"……Huh?"
A vacant, stupid sound slipped out between Junhyuk's lips. The arms braced against the floor straightened first. Then his knees unlocked, and his legs carried him forward as if they weren't his own.
Stop. Stop, damn it!
He drove strength into his thighs until they felt ready to split, but his steps wouldn't stop. All that reached him was the sensation of his soles meeting the floor, intact and useless.
"Hey! You—what the hell are you—!"
One step. Then another. They halted only when he stood right beside Inyoung.
"Sit."
He dropped. As if someone had kicked him behind the knees, they buckled on their own and slammed him to the floor.
"Kh—ugh…!"
He couldn't even turn his head. His neck had locked as if it were set in a cast, and Junhyuk was forced to stare straight at the scene inches from his face. His girlfriend, Inyoung, was choking as she swallowed the man's cock deep into her throat.
"You crazy—"
The curse leaked through his teeth. The massive shaft jutting from between the man's thighs rammed into Inyoung's mouth without mercy.
"Ghk, mmph, mmph…! Slurp, suck, kek!"
The outline of the cock crushing her throat bulged up along the slender column of her neck and sank again, over and over. Every time it drew back, frothy spit dragged from the corners of her gaping mouth and fell to the floor.
"Stop, Inyoung! …Who the hell are you? What did you do to her!"
He screamed until his throat tore, but his body stayed on its knees. Inyoung didn't so much as glance his way. She wrapped both hands around the man's cock and licked it, drool stringing from her mouth.
"Inyoung sucks cock really well. Doesn't she?"
The man said it quietly.
"……."
Junhyuk couldn't breathe properly. Every inhale stabbed through his chest like a needle. Worse than his body refusing to obey was the fact that he had walked here on his own two feet and was watching this filthy scene from inches away.
The man drew his hips back slowly. His spit-slick cock popped free of Inyoung's mouth.
"Hah, hah… Master, put it… inside me…"
Inyoung panted like she was begging, a string of spit hanging from her chin. The man only lowered his eyes to the kneeling Junhyuk. When their gazes met, a chill crawled up Junhyuk's spine. The man rubbed the jaw that had taken his fist and opened his mouth.
"Junhyuk. Come hold her up for me."
The moment the words landed, Junhyuk shot to his feet. His body didn't hesitate for an instant.
"Aaaagh! Stop—stop it, you fucking bastard!"
His mouth poured out curses, but his arms were already sliding under the armpits of Inyoung, bent over on the floor. Just like that, he hoisted her upper body up from behind. Her sweat-soaked back slapped flush against his chest.
"Ah, ahh… Junhyuk…?"
Half-unfocused, Inyoung stared blankly up at him.
"Inyoung, it's me…! Do you recognize me?!"
Her eyes slid back toward the man without an answer. Junhyuk's thick fingers seized the backs of her thighs, rough and unwilling, then folded her legs up toward her chest and wrenched them wide to either side.
"No… Inyoung, this isn't me doing this… please…!"
Tears welling, he looked down at what he'd done. Inyoung's cunt, spread open by his own hands, lay utterly bare. From the slit opened wide toward the man, slick dripped in beads. The man looked her over from top to bottom.
"Perfect."
"Please… please, just…!"
The man raised his right hand. Snap. The dry crack of a finger-snap rang through the living room.
At that short word, Junhyuk's brow twisted.
Tenfold what? What did he just do…?
He ground his teeth and searched Inyoung's face. Snap. Another clear sound struck his ears. On the surface, nothing had changed.
"Hh, nngh…?"
Inyoung let out a short, ragged breath and trembled. That was all.
"Inyoung, snap out of it…! Don't look at that bastard—look at me!"
She didn't answer.
It's nothing. Quit the bullshit…
Junhyuk was breaking into a cold sweat, trying to convince himself he could relax, when the man took a step closer. His face dropped between Inyoung's wet thighs, held wide and fixed open. He put out his tongue and swept it in one stroke from her entrance up to her clit. A long, wet slurp.
"Hiiik, aaahng—! Ah, ah! Hn, haaaang—!"
The instant his tongue touched her, Inyoung's waist snapped backward as if it might break. He had licked her once, and she squirted like a fountain. Hot fluid burst across the man's face. A sharp, raw smell clung to the tip of Junhyuk's nose.

"Inyoung…!"
She gasped for air, her whole body shaking. Her unfocused eyes stared blankly at the ceiling.
What the hell was that…?!
He had never seen a reaction like that, not even in porn.
"Hard to say if it's really tenfold. No way to check."
The man licked up the fluid running down his face. He looked at the trembling Inyoung for a moment, then put his mouth to her cunt again. Slurp, suck, a wet lick. The sloppy sounds kept coming. The tip of his tongue rolled in circles over her swollen, taut clit, working it without mercy, then caught it between his lips and sucked, loud and wet.
"Ah, hk! S'good, s'goo… hah, it feels too good! Hn, nn, aaang—!"
Inyoung's thighs spasmed inside Junhyuk's arms. With both arms hanging limp behind her, she jolted as if electrocuted every time the tongue brushed her, coming apart. The man pulled his lips away and tipped up his slick, glistening chin.
"You like it?"
His eyes didn't move. Only the corner of his mouth lifted.
"Haaaang—! I-I'm gonna go crazy, ah, nn—! Please, please…!"
In Junhyuk's arms, Inyoung's chest heaved as spit ran from her mouth.
"You have to say what you want."
"F-faster… fuck me, please, M-Master…! Please, fuck me…! Ang—!"
Master.
She said the word like it was nothing. Since when?
"Since when have you been with this bastard…!"
The images painted themselves in his head. The four days she wouldn't pick up the phone—Inyoung in this house, stuffed on that bastard's cock, moaning. The picture in his mind overlapped with the one in front of him. She stared at nothing but the man's cock, twisting her hips in desperate little circles.
"Junhyuk's watching from right behind you."
"I don't care, ahh! Your cock, put your cock in, your cock…!"
…Fuck.
The man laughed out loud, satisfied.
"Hahaha. All right."
His burning, swollen head pressed down on her soaked entrance. A size that didn't even compare to Junhyuk's own. Absurd.
That's… going in?
A wet stretch, a thick push, a squelch. The man drove his hips in slowly. Her flesh spread as if it might tear, barely taking the thick cock. A creak, a wet grind, a slick drag.
"Ah, aaaah—! Hk, nn, I'm coming, I'm coming again—!"
He was only halfway in, and Inyoung was already writhing, spraying again. Somewhere along the way Junhyuk had forgotten to scream. He just stared, blank. Over her trembling lower belly, the outline of the cock bulged and writhed. In the short time it took to sink in, she hit her peak three or four times in a row, her body folding with each one. At last the cock seated itself to the root inside her tight hole.
A heavy slap. In that instant her head snapped back hard, and the back of her skull slammed into Junhyuk's shoulder.

"Haaaaah—! Nnh, kek! Cough, ang—! Hhk, ohgok…!"
Inyoung's eyes rolled all the way up. Spit stretched in threads from both corners of her open mouth and swayed. Only a choked, gagging sound escaped her, as if her throat were plugged.
"What a mess. How many times is she even coming."
"Shut up… shut up, you son of a bitch…!"
The man didn't spare him a glance. He drew his hips back slowly, then drove them up, heavy and deep. The tremor of the body in Junhyuk's arms passed straight into him. Slap. A wet grind, a squelch.
"Hoo… at this rate she's going to break."
As if savoring the feel of her insides, his hips moved slow. Slick gushed from between Inyoung's thighs. The hot fluid soaked Junhyuk's hands, then dripped onto his jeans and sank in.
"Get off Inyoung, fuck!"
He screamed, veins standing out in his neck.
"Junhyuk. You're loud. Spread her legs wider."
His arms immediately folded Inyoung's thighs even tighter up against her chest.
"Yeah. Like that."
Squelch, slap, slap. With the gap opened wider, the sound of his thrusts went deeper.
Why… why did it turn out like this.
Four days ago he had been giddy, sending her a text about a hotel reservation. Nausea surged up. He tried everything to turn his head and escape the hell in front of him, but his neck stayed locked.
"Inyoung… nngh, uuugh…"
He clenched his teeth until it wasn't enough, and bit down hard on his lower lip. A crunch. Dark blood welled from the split. It ran along his jaw and dripped onto the wet shoulder of the woman in his arms. The taste of iron spread through his mouth. In his bloodshot eyes, the sight of his woman being speared through burned itself in.
I'll kill you… I swear I'll kill you…