Isa pulled herself into the cavern.

SPLASH!

The cool crystal-clear water parted around her athletic frame as she pulled herself out of it completely.

She sat on the smooth damp rocky ground of the cavern with her chest heaving as she caught her breath.

The ambient light of the underground space caught the droplets clinging to her pale skin, illuminating the sleek black fabric of her athletic bikini top and matching panties.

"The water sure is cold," Isa said with a small, breathless laugh, reaching up to squeeze the excess moisture from her long blond hair. "I’ve never swam underneath a waterfall before."

Wren swam up right behind her, breaking the surface of the pool with a sharp gasp for air.

He waded through the shallows, the water sloshing against his waist, and placed both of his hands firmly on the slippery rock ledge.

Before he could even attempt to push his own body weight up onto the stone floor, Isabella shifted on her knees and extended her slender arm right down to him.

"Here..." Isa offered, a warm smile gracing her lips.

Wren looked up, taking in the sight of her kneeling above him, and he took her hand without hesitation.

"Thanks," Wren said, his fingers wrapping securely around hers.

He pulled himself upward with her help, his bare feet finding purchase on the slick stone as he hauled his dripping body out of the subterranean pool.

He stood up straight, his dark wet boxers clinging tightly to his thighs, and let go of her hand to wipe the water from his eyes.

They both took a moment to look around the hidden cavern.

The space was breathtaking.

The high, vaulted ceiling of the cave was completely coated in thick clusters of bioluminescent moss that pulsed with a soft ethereal cyan glow.

The light reflected off the damp stalactites hanging from the roof, casting dancing blue shadows across the rocky walls and making the entire grotto feel like an alien planet.

"It looks beautiful," Wren said with his voice echoing softly against the cavern walls. "Though we need to head deeper."

Isa nodded in agreement, her green eyes scanning the dark tunnel leading away from the pool. She extended her hand toward him once more, offering her palm in the dim light.

Wren took it, their wet fingers intertwining naturally as they began their trek into the depths of the glowing cave.

The air grew significantly cooler the further they walked away from the waterfall entrance.

Their bare feet padded softly against the smooth, damp stone floor and the only sound in the cavern aside from the distant muffled roar of the cascading water behind them.

The physical contact of their joined hands provided a much-needed source of radiating body heat.

As they navigated the winding, narrow path, Isabella’s gaze darted around the cavern walls, her eyes lighting up with genuine fascination.

"Look at those," Isa pointed with her free hand toward a cluster of strange, pale, translucent ferns growing out of a crack in the stone. "Those are subterranean ghost-ferns... They only grow in places with zero natural sunlight and high mineral moisture."

A few yards later, she stopped and pointed toward a patch of glowing blue fungi hugging the base of a stalagmite.

"And that is a variant of luminescent widow-cap," Isa continued, her voice taking on an excited, academic tone. "You don’t want to touch those, they cause severe skin irritation."

Wren paused, his right eye twitching slightly as he looked away from the glowing mushrooms and stared down at the world-famous, thrill-seeking athlete holding his hand.

"Do you also have a hobby for this?" Wren asked, genuinely bewildered by her encyclopedic knowledge of obscure cave flora.

Isa blinked as a sheepish embarrassed flush rushed to her pale cheeks.

"No," Isa laughed, shaking her head as her wet blond hair swayed over her shoulders. "It’s my sister. She reads entirely too many botanical encyclopedias and never shuts up about them. I guess the useless trivia just stuck in my head."

"Well, it’s pretty useful right now," Wren teased, squeezing her hand playfully. "I would have probably tried to eat the glowing mushrooms."

"Idiot," Isa giggled, bumping her bare shoulder against his bicep.

They shared a warm comfortable smile with the isolated space of the glowing cavern pulling them closer together as they continued down the winding tunnel.

Soon after the cute teasing exchange, the narrow path opened up into a much larger, perfectly circular stone chamber.

The bioluminescent moss was thickest here, bathing the entire room in a bright, vibrant blue light. Right in the direct center of the chamber sat a massive, imposing stone pedestal.

Wren and Isabella walked closer, their eyes widening at the incredible craftsmanship.

The pedestal was carved entirely in the shape of a massive coiled serpent. The stone snake was at least eight feet tall, its thick, scaled body wrapping around a central pillar.

Its jaws were unhinged, pointing directly toward the ceiling, and resting securely upon its flat stone tongue was an ornate, dark metal box.

They stopped right in front of the massive statue.

The dark metal box possessed a large intricate keyhole right on its front face, as well as a small, folded piece of paper resting right on top of the lid.

Isa let go of his hand and reached forward, pulling the piece of paper loose from the damp metal.

She unfolded it carefully, making sure not to tear the fragile material, and they both leaned in close to observe yet another cryptic poem written in elegant, fading ink.

"To claim the prize within my maw, you must bypass the iron jaw," Isa read aloud, her brow furrowing in deep concentration. "The metallic tooth is far from sight, resting where the scales bite tight. Run your hand along my spine, and the hidden path will soon be thine."

Isa lowered the paper, a highly confused expression painting her face.

"What does that even mean?" Isa asked, her green eyes scanning the solid metal box. "Is the key somewhere on the ceiling?"

Wren looked at the massive stone serpent, his mind processing the specific wording of the riddle.

"I don’t think so..." Wren pointed out, stepping right up to the base of the imposing statue. "The poem says the metallic tooth is resting where the scales bite tight. The key is probably somewhere on the skin of the snake itself."

With that deduction, he walked forward and pressed his bare hand directly against the cold carved stone scales of the serpent’s coiled body.

He began running his palm slowly up the rough texture of its spine, feeling for any irregularities in the statue.

He traced the stone upward, past the first massive coil, and right as his fingers brushed the back of the serpent’s neck, he felt a distinct rectangular groove hidden beneath a raised stone scale.

Wren pressed his thumb firmly against the groove.

CLICK.

A small satisfying mechanical sound echoed from deep within the stone. One part of the serpent’s neck smoothly opened up, a hidden stone panel sliding back to reveal a dark hollow compartment inside the statue.

Wren pulled his hand into the dark opening, his fingers brushing against cold hard metal.

He grabbed the object and pulled it out into the blue light, bringing out a singular, ornate brass key adorned with an intricate snake-head bow.

He held it up, showing her the prize as Isa smiled widely with genuine admiration flashing in her eyes.

"Smart..." Isa complimented him.

"Why don’t you do the honors?" Wren offered, holding the brass key out toward her.

Isa shook her head, her wet blond hair clinging to her neck. She stepped directly into his personal space, her bare stomach almost brushing against his damp boxers, and reached out to wrap her soft hand entirely over his.

"Why don’t we do the honors together?" Isa suggested and Wren swallowed hard, feeling the warmth of her palm against his knuckles as he nodded slowly.

Together, their hands overlapping, they raised the brass key toward the pedestal. They both put the key directly into the lock on the front of the dark metal box.

Instantly, it slotted in perfectly, the complex metallic tumblers aligning with the intricate grooves of the brass and they turned their wrists in unison.

CLUNK.

The internal locking mechanism of the box clicked free as the dark metal lid popped open a fraction of an inch, releasing a small puff of stale air.

Wren pushed the lid all the way back and resting right on the velvet lining of the interior, was... another piece of folded paper?

"Is this a joke?" Wren muttered.

Isabella reached into the box, took hold of the thick map, and opened it up fully. It wasn’t a joke; it was the real prize. The top of the paper featured a small beautifully written speech in golden ink.

"Congratulations to the brave souls who have conquered the weeping cavern and reached the second stage of the Grand Treasure Hunt," Isa read the golden text aloud. "The true prize lies hidden away and below is the map of the island. These specific spots that have been marked in red X hold the three keys. Once you get all of the keys, the way to the final treasure will be opened."

Below that elaborate speech was a highly detailed, hand-drawn map of the entire luxury resort island. Three distinct, bright red X marks dotted the landscape... one located near the towering cliffs on the northern shore, one deep within the crater in the center, and the last situated near the eastern beach.

Isa traced the red marks with her fingertip with a bright excited smile spreading across her face.

"They probably want us to find all of these specific locations for the prize, huh?" Isa said, looking up at him with her green eyes sparkling. "It’s almost like I’m a kid again."

"Well, let’s get going," Wren said, taking a step back from the massive serpent statue. "There’s no time to waste if we want to beat the other teams to those spots."

Isabella nodded in complete agreement.

She closed the dark metal box back up, leaving the empty cavern exactly as they found it. She carefully folded the thick map into a small square.

Since she didn’t have any pockets on her tiny athletic bikini bottoms, she grabbed the edge of her black top, pulling the fabric away from her chest, and securely tucked the folded paper right into her deep cleavage just to be sure it wouldn’t get wet or lost on the swim back.

Wren watched her do this.

He watched the way her pale fingers pushed the paper against the soft curve of her breast, the way the tight black fabric snapped back into place highlighting the generous swell of her cleavage.

He instantly turned his entire body around, facing away from her and staring intensely at the glowing blue moss on the far wall of the chamber.

He gritted his teeth as he felt an unavoidable rush of blood flooding directly toward his groin.

The combination of the adrenaline from the cavern, the extreme physical proximity, the cold water making her nipples harden against the thin fabric, and the intense visual of her tucking the map into her bra was far too much for him to handle.

’Why the hell am I getting hard over anything...?!’

His damp dark boxers were already straining violently with the fabric tenting outward as he got incredibly hard just from looking at her standing there in her wet panties.

’I truly am a pervert, aren’t I?’ Wren thought, inwardly cursing himself for lacking basic self-control in the middle of a high-stakes treasure hunt.

He took a deep breath, trying to force his mind to think about unsexy things but the heat in his lower half refused to subside.

Isabella finished securing the map and turned around to face Wren. She stopped in her tracks, blinking in confusion as she saw him facing completely away from her.

She let her green eyes drift downward, and she instantly noticed the distinct, undeniable bulge straining aggressively against the dark fabric of his wet boxers, jutting out from his profile.

A dark flush crept up her neck, painting her cheeks a bright feverish red.

"Ren-Ren, what’s up?" Isabella asked and Wren said nothing for a moment.

"Just... give me a second," Wren muttered toward the glowing wal.

Isabella didn’t give him a second. She took a slow step forward, the squelch of her bare feet on the wet stone echoing in the quiet chamber.

"It’s like back on the ship..." Isabella murmured softly. "You told me to help you, right?"

Isabella took another step forward, closing the distance until she was standing right behind him.

"I can’t have you walking around with a massive tent in your pants when we want to hunt treasure, so..." Isa trailed off with her warm breath brushing against the damp skin of his bare shoulder.

Wren slowly turned back to face her.

She was looking up at him through her wet eyelashes.

"It’s my fault you’re exactly like this right now," Isabella added. "So like an adult that I am, I’ll take responsibility."

Before Wren could even form a coherent sentence to reply, Isabella closed the final inch between them.

She reached up, placing her soft cold hand directly against his warm cheek and stood on her tiptoes. Isa pressed her soft lips entirely against his.

The kiss was electric as Wren’s hands moved instinctively, wrapping tightly around her slender waist and pulling her athletic frame flush against his own body.

Isabella groaned softly into his mouth, parting her lips to allow him entry.

Their tongues met, sliding and battling against each other in a deep wet highly passionate exchange. The taste of the sweet cavern water mixed flawlessly with the natural taste of her saliva.

Isa pushed forward with her hand moving from his cheek to tangle in his damp blond hair. She aggressively backed him up, forcing him to walk backward slowly through the center of the chamber.

Wren matched her pace, his hands sliding down from her waist to grip the soft firm curves of her ass through the wet fabric of her bikini bottoms.

The friction of their bodies grinding together as they walked was agonizingly good, his rock-hard erection pressing directly into the flat expanse of her stomach with every backward step.

They kept kissing, sucking on each other’s mouths with loud wet smacking sounds filling the quiet cavern.

Finally, Wren’s bare back hit the cold, damp stone wall of the chamber with the glowing cyan moss squishing slightly under his weight.

Isabella pulled her lips away, a thin string of silver saliva connecting their mouths for a brief second before it snapped.

She was panting hard, her chest heaving as she looked down at the massive bulge straining against his boxers.

"I’m not exactly good at blowjobs," Isabella admitted with a nervous but determined flush burning on her cheeks. "B-but I’ll try..."

With that bold confession, the world-famous racer went straight down to her bare knees on the cold stone floor.

Wren’s breath hitched violently in his throat, his hands resting on the rock wall behind him for support as he looked down at her.

Isabella reached out with trembling fingers, hooking her thumbs into the elastic waistband of his dark, wet boxers.

She pulled down on the fabric in one smooth motion, dragging the soaked underwear down past his thighs.

His thick throbbing dick popped out instantly into the cool cavern air, the shaft sprung forward with so much power that the blunt purple head almost hit her directly in the face.

Isabella’s green eyes widened to the size of saucers. She stayed entirely frozen on her knees, staring at the intimidating weapon hovering mere inches from her nose.

’He’s bigger than Marcus by a lot...’ Isabella thought, her mind struggling to process the size of his anatomy.

Wren had a lot more thick pulsing veins lining his thick shaft, and he was undeniably much bigger, longer, and thicker than what she was previously used to handling.

The dark, prominent veins throbbed visibly in the blue light, a single drop of clear pre-cum weeping from the slit at the very tip.

She swallowed hard but she didn’t back down.

Isa reached her hand forward, wrapping her pale fingers securely around the base of his shaft as she stroked his length slowly, her hand sliding up the thick veins to the base of the head, familiarizing herself with his impressive girth as she prepared her mind to take him in.

’I’ll make you feel good,’ Isabella thought.

She leaned her head forward, parting her soft lips wide. She stuck her pink tongue out, letting it brush against the slit, and just as the broad sensitive head of his cock touched the warm interior of her mouth—

CLACK! CLACK!

The sharp unmistakable sound of hard-soled shoes striking the damp stone floor cut through the quiet cavern like a gunshot.

Someone was coming!