RE: Keep it in the Family (Secret Class) 182 — Under the Stars IV (Slightly NSFW)

Su Ah's POV:

Jae-il blinked in surprise. He extended a hand toward the sleeping bag.

Then he hesitated.

Once he lay down and embraced her tightly, their combined body heat would melt away the chill from both their skins.

Their warmth could sustain them through the night, nestled together securely within the bag and the comfort of each other's forms, and maybe...

... they might share even greater closeness.

Su Ah remained facing away, yet Jae-il caught the faint quiver in her breath.

"Alright, I'm coming in, Noona."

She wriggled further into the bag, her body stiffening.

But when Jae-il slipped inside, the only sensation was the firm press of her brother's form against her.

Su Ah's entire focus shrank to that one electrifying spot of contact.

"You're shivering." He whispered, his warm breath brushing the delicate skin at her nape.

It wasn't cold—it was raw desire masquerading as shivers—but she simply nodded, gripping the bag's material tightly. Jae-il's arm encircled her waist, drawing her flush against his chest. His palm settled on her belly, solid yet reassuringly gentle. It simply lay there, at ease.

Still, the subtle, tender sweeps of her brother's thumbs tracing the contours of her waist, belly button, and hips made her blood race wildly. She hoped her thundering heartbeat wouldn't betray them. Who was she fooling? Jae-il surely sensed the fire building between her legs.

"... hng..."

A gasp escaped her, fingers digging in as she stifled her breath.

His fingertips didn't venture higher or lower to unravel her. It was just this caring touch, those lazy circles that carried no overt lust—at least, that wasn't the apparent purpose.

Jae-il buried his nose in her hair, letting out a slow breath, then fully enveloped her in his arms, tugging her back hard against himself.

Their bodies aligned perfectly, from shoulder blades to calves and entwined legs...

Su Ah drew in a sharp breath, quivering and rigid.

Intensely warm. Incredibly, overwhelmingly warm.

So much so that her knees weakened beneath her.

Several minutes ticked by in near silence. The raging storm outside faded against the roar of her pulse in her ears and the frantic heave of her chest. "Haah... haaah..."

"Are you cold, Noona...?"

"... nnnh."

Her voice couldn't be trusted, especially as Jae-il's breath caught when his fingers accidentally drifted upward.

Su Ah struggled to think—though there wasn't much left to ponder. Her body had clearly decided for itself.

She adjusted her position, then shifted once more. A delicious glide backward until—

Oh.

She sensed it now, rigid and demanding, nudging into the crease of her panty-clad rear. Jae-il stiffened abruptly behind her, a sharp hiss escaping his mouth.

Fresh waves of heated tingles rippled across her skin from her brother's rough groan.

Su Ah's eyes widened. The throbbing, velvety hardness under her ass strained fiercely against her brother. She nibbled her lower lip, squeezing her eyes closed while deliberately, painstakingly, pushing back bit by bit, her skin and silky underwear stroking a thickening, unyielding bulge.

His hips jerked forward, pressing nearer and—

Oh, gods! Su Ah moaned quietly into her folded arms, a ragged gasp chasing after.

Su Ah clamped her thighs tight, letting out a soft whine. She ignited from her brother's instinctive thrust, even more from Jae-il's guttural grunt as he rocked his hips into her once, twice—

The feeling constricted her throat, misted her vision with tears, the friction sparking ecstasy along her spine.

A quick gasp, then the most tantalizingly filthy, breathless moan. Jae-il's fingers sank into the yielding flesh of her stomach, yanking her even tighter against him.

"Jae-il..." Su Ah couldn't fathom where her boldness came from, or the enchantment her brother wove as she brazenly rocked against him back and forth, damn, it felt incredible. "My panties... I... we should probably remove them. J-Just to ensure there's no clothing barrier between us. Just... so we can stay warmer..."

There. It came out reasonable and casual, not like a sister blatantly inviting her brother.

"... I agree." His voice rasped out. And gradually, so very gradually, his fingertips crept along her skin toward the ties of her final barrier.

One swift pull, and her panties became mere silk tangled at the base of the sleeping bag.

He didn't hesitate with his own underwear, yanking them down until he kicked them roughly away to bunch with hers at their feet.

The abrupt contact of her naked rear against the stiff length between his thighs left her quaking violently, yet yearning for his touch with equal fervor.

She shifted herself backward a little more, sensing the obvious hardness pressing insistently against her naked rear. Then her hips jerked sharply as Jae-il's fingers slid downward, inching toward the center of her thighs.

A rough gasp burst from her lips. His caress sent her hips stuttering back against him once more, and she clamped her thighs shut to ease the intense throbbing that suddenly flared between them.

Jae-il thrust forward against her backside, drawing another drawn-out moan from her. His erection nestled snugly between her cheeks. She squirmed. Jae-il pushed back. His grip tightened on her belly, and his hips chased her movement with a powerful surge.

A faint whimper she couldn't fully suppress slipped out.

There was truly no reason to muffle her sounds, yet perhaps that last fading shred of pride made her reluctant to let him see how deeply this mere grinding affected her.

Her gaze turned hazy.

In reply, his lips brushed the curve where her neck joined her shoulder, leaving a line of kisses that sparked bursts of light behind her closed eyes.

She arched boldly into his caress, all shame abandoned.

Jae-il understood fully, showing no trace of refusal. Instead, his hands clamped more securely on her hips, holding firm. Drawing her back into the rhythm of rubbing against him.

Within the cave's enclosure, their voices rang out clearly now. Moans and heavy breaths, gasps and trembling sighs.

His shaft stood stiff, gliding steadily along the cleft of her ass, pre-cum spreading slickly between her cheeks—flowing like a stream into the flood between her legs.

The wetness soaking her core astonished her; she could scarcely believe it all came from within herself.

No words passed between them as Jae-il gradually slipped one arm beneath her, placing it over her tender mound. She fought not to buck wildly. She lost spectacularly. Her hands gripped his tightly, while his other hand ventured into the drenched chaos of her slick entrance.

"I'm sorry..." She murmured an apology. Yet their hip movements never slowed, not even as her breath caught when his fingers brushed that ultra-sensitive spot at her center, so slippery and pulsing that she could hardly stay still, gently rocking against his fingers and his hardness.

"For what...?" Jae-il panted hotly into her ear.

"For... ... a-all of... ... this..." Su Ah gasped out.

This?"

Su Ah whimpered.

Gods.

"Look down."

Her eyelashes trembled at his gruff order, her chest heaving fast.

How had this shifted from simple warming cuddles to something she hesitated to label full-on sex?

Why did her legs feel so utterly, intoxicatingly alive with sensation?

Of course, she had seized the comet sighting as a pretext to isolate themselves far from everyone. She had schemed this getaway precisely to share this intimacy with him. The apology merely soothed her inner guilt.

Even so, guilt nagged at her for exploiting him—her very own brother.

Su Ah craved it desperately, but...

Jae-il silenced her doubts by claiming her earlobe with his mouth, trailing gentle kisses to the tender area under her ear, leaving Su Ah breathless and helpless.

Soft whimpers escaped as he persisted. His hips kept up their endless, languid thrusts.

"I-I'm sorry..." She sobbed, the motions driving her to grind harder into his hold. Her body seized up, bowing sharply. "I-I'm using you!"

Yet her fingers dug into his hands. Clenching harder, she pulled him on and lifted her hips into his palm, waves of forbidden ecstasy curling her toes and dizzying her mind.

The pleasure surged quicker and fiercer through her, and with Jae-il's grinding hips, he teased that swollen pearl between her thighs repeatedly, over and over in endless waves.

Her soft cries grew into desperate, wailing sounds as his rhythm accelerated. She mirrored it with rolling hips, desperate to lose herself in the sensation that overwhelmed everything, chasing that seductive void relentlessly.

Jae-il's ragged breaths by her ear blended with his deep, guttural groans. She no longer cared; no shred of control remained over her primal urges.

Tears welled in her eyes as Su Ah writhed. In that moment, his movements turned wild with the desperate frenzy of impending release. "Jae-il, J-Jae-il!! Oh~!!"

A quake ripped through every muscle, every inch of her body.

Her neck arched backward, hitting a fresh peak that made her grind fiercely into him. Muscles tightened and rippled wildly, her abdomen thrusting outward. Jae-il's thrusting hips faltered suddenly, as he poured every ounce of effort into teasing that exquisite spot which left her shaking helplessly against him, hurling her past the brink with a raw, guttural sob.

She had craved this so damn much!

Su Ah slumped utterly limp onto the sleeping bag, gaze unfocused, perspiration sticking wisps of hair to her skin.

Her lips quivered while the waves of pleasure faded, allowing awareness of her environment to return. The sleeping bag. The cave. Just then, the noise from outside pierced her thoughts.

"J-Jae-il...?" Her murmur carried hesitation, shyness, embarrassment. She wriggled into an ideal spot to peer directly up at his features, then glanced down at his rigid, pulsing shaft.

He hadn't reached his climax.

His gaze pierced hers intensely. Their hips continued a soft, rhythmic sway.

"... Noona..." He exhaled, his eyes growing shadowed.

Su Ah averted her eyes sharply as shivers coursed through her once more. His cockhead remained snugly nestled between her plump cheeks, throbbing—all it would take was her word.

"Jae-il..."

Meeting his stare to voice it was impossible. Yet if not this moment, when? Stripped bare, secluded in this natural haven shielded by the storm. No passersby. No eavesdroppers for those taboo phrases. Above all, none would discover that in this ancient cave atop an obscure mountain amid raging downpour, this forbidden pair had crossed the initial threshold.

"Jae-il... take me."