The key scraped in the lock.
A slow, metallic twist.
Min-jae's stomach dropped like a stone.
Yumi's nails dug into his arm, her breath hitching in tiny, panicked gasps.
Ji-eun stood frozen mid-step, robe hanging open, cum still glistening on her inner thighs, tits heaving with every shallow breath.
The door eased inward an inch.
Dad's silhouette filled the gap—tall, broad-shouldered, still in his travel-worn shirt.
Light from the hallway spilled across the carpet, reaching toward the bed where the sheets were tangled and damp.
Ji-eun moved first.
She stepped forward calmly, pulling the robe closed just enough to hide the worst of the evidence. Her voice came out smooth, warm, like she'd been waiting for him all along.
"Honey?"
She tilted her head, smile soft and sleepy. "You're up already? I was just coming back."
Dad blinked against the dim room.
His eyes scanned past her—toward the bed. Toward the shape under the covers that was Yumi, curled small, pretending to sleep. Toward Min-jae, half-hidden in the shadow beside the closet door, shirt untucked, hair mussed, lips still swollen from earlier.
Dad frowned.
"I heard… noises. Again."
His gaze lingered on Ji-eun's flushed cheeks, the way a few strands of hair stuck to her damp neck. "You okay?"
Ji-eun laughed quietly—light, disarming.
"Just a nightmare. Yumi woke up crying. I was comforting her."
She stepped closer to Dad, body brushing his, hand sliding up his chest. "Poor thing's been stressed with exams. I told her to stay here tonight so I could watch over her."
Dad's shoulders relaxed a fraction.
He rubbed the back of his neck. "She alright now?"
"Sleeping like a baby." Ji-eun nodded toward the bed.
Yumi let out a small, perfect sleepy sigh on cue—practiced, convincing.
Min-jae held his breath so hard his chest burned.
Dad looked at the bed again.
His eyes narrowed slightly.
Something caught his attention—the faint wet spot on the sheet near Yumi's hip. The way the air smelled faintly of sex and jasmine lotion.
He took one step inside.
Ji-eun moved faster than Min-jae had ever seen.
She pressed herself against Dad's chest, arms looping around his neck, lips finding his in a deep, distracting kiss.
Dad stiffened for half a second—then melted, hands settling on her waist.
"Mmm," she purred against his mouth. "I missed you so much tonight. Come back to bed. Let me show you how much."
Dad groaned low in his throat.
His hands slid down to grip her ass through the robe.
Ji-eun arched into him, grinding subtly, robe parting just enough to give him a glimpse of bare skin.
He forgot the room.
Forgot the suspicious wet spot.
Forgot the strange scent.
Ji-eun broke the kiss long enough to whisper, "Carry me back to our room. I want you inside me. Right now."
Dad didn't need convincing.
He scooped her up—robe slipping off one shoulder, exposing the curve of her breast—and carried her out.
The door clicked shut behind them.
Silence crashed back into Yumi's room like a wave.
Min-jae exhaled so hard his knees almost buckled.
Yumi sat up slowly under the covers, eyes huge.
Cum still leaked from between her thighs. Her nipples poked against the thin sheet.
They stared at each other.
Neither spoke for a long moment.
Then Yumi whispered, "He almost saw us."
Min-jae nodded.
His cock—traitorous, insatiable—was already stirring again at the memory of Ji-eun's distraction play. The way she'd ground against Dad while cum dripped down her legs from Min-jae's earlier load.
Yumi noticed.
Her gaze dropped to the bulge in his pants.
She licked her lips—slow, deliberate.
"Oppa…"
Her voice was small, needy. "I'm still so wet. I can feel your cum inside me."
Min-jae groaned.
Guilt screamed in his head—Dad was literally down the hall, fucking Ji-eun right now—but the sound of Yumi's whisper drowned it out.
He stepped closer.
Yumi scooted to the edge of the bed, legs parting.
The sheet fell away. Her pussy was swollen, pink, glistening with their mixed cum. A thick white drop slid out and down her ass crack.
She reached for him.
Fingers curled around his zipper.
"Let me clean you up," she murmured.
"Like Mommy did."
Min-jae didn't resist.
He let her pull him out—hard again, veins standing out, head slick.
Yumi leaned forward, tongue flicking the tip, tasting the remnants of Ji-eun and himself.
"Mmm," she hummed. "Tastes like family."
She took him deeper, cheeks hollowing.
Min-jae's hands fisted in her hair.
He fucked her mouth slowly—shallow thrusts, savoring the wet heat.
Yumi moaned around him, fingers slipping between her legs to rub her clit.
She was soaked—fingers coming away shiny.
Min-jae pulled out with a wet pop.
"Turn around," he ordered, voice rough. "Ass up."
Yumi obeyed instantly.
She knelt on the mattress, face down, ass high.
Her pussy dripped onto the sheets.
Min-jae positioned himself behind her.
He rubbed his cock along her slit—teasing, coating himself in her juices and his own cum.
Yumi whimpered.
"Please, oppa… put it in. I need you again."
He pushed in—slow, inch by inch.
Yumi's pussy swallowed him greedily.
She was tighter this time, swollen from earlier, still full of his cum.
"Fuck," he groaned. "You're so full of me."
Yumi pushed back.
"More… harder…"
Min-jae gripped her hips.
He started thrusting—deep, steady, building speed.
The bed creaked softly.
Skin slapped against skin.
Yumi buried her face in the pillow to muffle her moans.
"Oppa… yes… fuck your little sister…"
Min-jae leaned over her, chest to her back.
One hand slid around to rub her clit.
The other found her throat—light pressure, possessive.
"You like that?" he growled. "Getting fucked by your own brother while Dad's down the hall?"
Yumi nodded frantically.
"Yes… yes… don't stop…"
He pounded harder.
The angle let him hit deep—against that spot that made her shake.
Yumi's pussy clenched, milking him.
"I'm gonna cum again," she gasped.
"Inside me… please…"
Min-jae thrust deep and held.
He exploded—another thick load pumping into her already-full cunt.
Yumi shattered around him, body trembling, muffled scream into the pillow.
They collapsed together—sweaty, spent, breathing ragged.
But the hallway light flicked on again.
Footsteps.
Dad's voice—closer this time.
"Ji-eun said she was checking on Yumi… but the master bathroom is empty."
The doorknob rattled.
This time—no lock.
The door began to open.
To be continued…
Dad is pushing the door open. He's about to see everything. What happens in the next heartbeat?