((Author's Note: Lots of lewd/graphic depictions and writing for this chapter and the next!))

...

"Geez, I can't believe they're sending us out this late," one of the kakushi traveling up the mountain grumbled, a young man by the sound of his voice. His words rang out more clearly as he winded up the switchback trail, momentarily nearer to Aoi but further down the mountainside. "One girl disappears suddenly, and we all get sent out regardless of the hour to scour about for her," his gripes continued, slowly fading as the path proceeded further away, but at the rate it moved along, it would be less than a minute before they arrived at the shack and the spring. "If we find her, I bet it'll just be her making out with somebody."

"Tch, well aren't you flippant about somebody going missing," a female voice derisively responded, travelling alongside the man. "I mean, there was a brief scream, right? So who knows what happened." There was a brief pause where only the crunching sounds of footfalls on the fallen autumn leaves signaled their approach, but soon the girl spoke again, "Who's your bet if she's making out with somebody?"

"Tanjiro! I'll bet the Sun Pillar returned in secret, surprised her, and they ran off together for a spell. Those two have been close before, and he's the one all the girls want."

"Yeah, he's definitely an improvement on you," the female voice chuckled, a distant thud cutting off that laughter, "H-hey~ Oww... that wasn't nice." The voices started winding around a massive boulder below, growing their dimmest before their final ascent, but the woman could be faintly heard, "I'll bet it's Kanao~! Super cute butterfly girl make out party!"

Inosuke rose suddenly from the water, standing up with enough force that he knocked aside his boar's head mask, spinning and looking towards Aoi in that instant, his green eyes burning with energy as his entire body seemed to bristle with resolution. "A-aoi! Even if I find somebody that I like more, I'll always-!" his words cut off suddenly, water splashing as he fell back into the spring.

"Did you hear something?" the male voice said aloud, the footsteps stopping as if they were trying to discern the sound and follow its source. Cautiously, they proceeded further, soon cresting those final steps up towards the hot springs and scanning over the scene. It was dark enough that the folded clothing wasn't readily visible without more direct searching, but as they looked over the steamy spring, there was nary a soul to be seen.

Aoi had hoped against hope that her initial inkling had just been a fluke. An imaginative whisper of the wind or a random sound she had mistaken. Glancing back behind her shoulder it was like the head of the boar and Inosuke beneath had melted right into the spring. His initial lack of alarm had her doubt that she had actually heard anything, knowing how keen his abilities and senses were well beyond hers. He would have picked something up long before she did, or before anyone came to catch them both in the spring. He was also very distracted with their conversation.

When it became certain and beyond doubt that they were indeed being happened upon, it was already too late to really do anything about it. The other people were close, hers and Inosuke's clothes were further away, and Inosuke was still in the spring while Aoi was barely out of it. Despite how warm the soak in the spring had made her Aoi suddenly felt cold water trickle down the curve of her sensitive back with the chill air. What would people say if they found out that she and Inosuke had been bathing together? While she honestly didn't care what people might ultimately think of them, whether they ever were or weren't in a real relationship, it seemed premature to be so bold and her modesty wanted to do nothing more than hide and figure it out later.

Following that instinct, she had rounded on Inosuke as soon as he stood up to make his answer clear. But rather than let him speak and finish, she was sorry to cut him short, catching him around the neck and shoulders with an arm as she half dragged, half carried, half hauled him back into the spring and out from the edge to dive behind the nearest bush that had been leaning next to the water.

"Doesn't look like there's anyone here." The woman answered to her search partner, who must have meant a bit more given her level of comfort with him. "Looks like a perfect chance to skinny dip!"

Besides the kakushi woman being so flippantly good at hook up rumors, Aoi questioned just how seriously they were taking their search and rescue task with the interlude. But she was far more preoccupied with the new position she had put herself and Inosuke in after she had just tried to push him away a little bit for the sake of their friendship. His body was radiating heat while she was starting to feel colder, and he was more palpable than the cut of his musculature would have let on. Still, in comparison to her bosom being squished against his shoulder while she held her palm over his mouth, she was far softer and slender. The bush was tall enough for them to sit up and not much else, so she had curled up against him trying to be as small as possible while hiding her more important parts from view.

"You can't be serious...Okay, I guess you are." The boy had sighed as the rustle of clothing was quick and carelessly left behind. An appreciative whistle sounded just before a small splash was heard with someone entering the spring. "Wearing these uniforms all day I forget how good you look without them on."

"Hehe, you too," The girl, who turned out to have long brown hair, giggled as she attentively watched the boy strip to join her. "Ahh, it feels so good to be out of bed and not feel like dying!" The boar's head bobbed in the water as it hid behind one of the rocks in the spring, peering in on the couple with the other hidden pair.

Halted mid-speech, Inosuke couldn't help but stare in shock as Aoi rushed headlong towards him, the ample oppai he had spoken of with her bouncing vigorously as she darted forward. He could have easily resisted her small frame colliding with him and dragging him towards the far shore, but he was so stunned by what was happening that he yielded to her efforts. Together, they crashed onto the smoother stone and through the brush, the noise quickly halting as they laid together, flesh pressed to flesh, her hand over his mouth.

It took a moment before he noticed the pair of kakushi searching about briefly near the entrance to the spring, hovering near the shack without seeming to notice the folded clothing tucked away there. "Mmfff," he grunted quietly against Aoi's hand in realization as to why she had tackled him out of the water, but even understanding why, it was hard to look past what he'd seen. And what he could feel too.

Heavy yet soft, the cushion of her bosom pressed against his shoulder and arm, squeezing over his steely biceps as she laid against him. Inosuke couldn't help but dart his eyes towards her, incapable of speaking with her hand cupped over his mouth, his gaze wide and confused, cheeks burning with heat. Their legs were tangled together from the spill, making movement awkward enough that they might be discovered, the position rather compromising and scandalous even if the pair hadn't done anything. Smooth skin rubbed against hard muscle, Aoi shivering in the chill night air and snuggling up even closer to cling to his warmth. His pale green eyes met her indigo gaze while he slid his arm around her shoulder, helping to draw her closer as the breeze continued blow over them both. Close as they were, Inosuke could even feel the damp downy hair of her nethers against his hip.

Already, Inosuke's thickness started to swell, the sensation of her body against his causing a natural reaction, and that grew even more pronounced as he watched the two kakushi openly strip together, admiring each other's bodies. Since they were seemingly alone, there was no shame visible as they stripped for one another, dipping into the spring together and touching one another freely.

"Kanao and Aoi, eh~?" the man seemed to hit back upon their earlier conversation, his smirk wide enough that the hidden voyeurs could make it out, "I didn't realize you were into girl-on-girl? That's actually pretty kinky, hehehe!" His arms enfolded around her, leaning his forehead against hers, "I suppose I'd be alright with you being stolen away from me by a cute girl..."

The female kakushi rose up on her toes, silencing her lover with a fiery kiss, soft moans floating up from their lips as they pressed in tighter. Amid the flurry of kisses and lurid tongue teasing, her hand slid down onto her man's length, grasping him and visibly stroking him where Aoi and Inosuke could see. "How could I get stolen away from you by a girl when they don't have this?" she giggled, caressing that cock, "I just think those two are real cute... not something for me specifically."

"Oh yeah? Addicted are you? I am pretty thick," he laughed, the sounds of his breaths growing more audible the more he was jerked off. For all his boasting, he couldn't measure up to Inosuke, the Beast Pillar's pillar having risen to full prominence, hard and huge just beneath Aoi's gaze.

Dipping down into the water, the female kakushi nuzzled against that dick, purring up to her lover, "Thick and very tasty." Soon, her hand fell away, replaced by her tongue and then her lips, visibly going down on the man. Neither were aware of Aoi or Inosuke's presence, and the man started to moan freely as he was given head.

Aoi felt as if she ought to be in more shock, not only naked and pressed up against an equally naked man, but also witnessing a pair of familiar strangers being freely intimate with one another as they enjoyed what they believed was a secluded and private moment in the hot springs behind her estate. Compared to herself and Inosuke's innocent touches and meek carefulness with one another, these two were bold, completely at ease, and eager. So much so, in fact, that their forwardness was both fascinating and horrifying all at once. It happened so fast that she wouldn't have been able to say anything even if she wanted to in order to stop them.

As Inosuke grunted softly beneath her hand, Aoi managed to tear her eyes away for a moment to look at him, blushing scarlet at their sudden closeness. Even their faces were barely separated by little more than her palm. And the feeling of him against the length of her body was making her shiver in a way the cold weather could hardly compare to. His arm closing around her shoulders helped and felt better, though she had to bite back a small moan as her clinging closer ground the center of her now highly sensitive body against his hip. His own reactions were even more obvious as that manhood became all the more prominent against her leg, growing to a size beyond her imagination. And certainly putting the other boy that kakushi girl was fawning over to shame.

As the sound of those moans began to float openly in the spring clearing, Aoi bristled and shifted her hand from Inosuke's mouth to his eyes. It was impossible to close his ears and he had already seen what was happening, and after their conversation he was clearly aware and old enough to know what was going on. Yet somehow it made her feel a little bit better to think she was shielding him.

"Mmm... did you get bigger? It's harder to deep throat now. Or maybe my throat is just numb from all that medicine I've been taking. Ick. I've been wanting your cum to help wash it down all this time." The woman's voice spoke up after a bit, both of her fists pumping that saliva slickened member.

"I'll feed you as much cum as you want, Yurie," He answered her, fingers stroking through her hair affectionately despite how he guided her back onto his cock and encouraged her to try to swallow and take down more of him. It didn't take much longer before she seemed to drop and bury her face in his loins, a stuttered grunt wrenching from his throat and the bobbing of Yurie's throat marking how quickly she swallowed.

Unable to watch any longer, Aoi buried her face and muffled her squeal of frustration in the crook of Inosuke's neck as her hand slipped away, thinking and hoping their uninvited guests would be done. "Sorry, sorry...!" She tried to whisper to Inosuke, apologizing for both the situation and their current state. Despite hoping they'd be gone soon, Yurie was climbing up and bending over the edge of the far side of the spring, putting herself fully on display for all of them before her boyfriend began to kiss up her thighs and make his way to the pinkness between them. Her squeal of delight when she felt his tongue snaking into her prompted Aoi to look back and realize they weren't finished yet at all. In fact it looked like they were getting into the swing of things.

"Oh no... they're going to go for it. All the way!" Aoi panicked through gritted teeth. Shifting on him rubbed her more purposely against his hardness, but it was just as hard to stay still and she was more wet than just the water had made her. Her palm smoothed down over Inosuke to cup and hold that length against her thigh, as if she might help cover him with her and keep him still instead. "How are we going to stop them?"

"Ooooo~ Hiro! " Yurie cried out enthusiastically, squirming against his face.

Transfixed by the sight before him, Inosuke's dark eyebrows rose as his eyes widened, taking in the sight of the young woman devouring the erect pole before her. He knew of sex and mating, but erotic behavior of this sort was beyond his ken. It seemed as if Yurie were seeking to consume that cock, but rather than bite down, she simply sucked as her head bobbed back and forth. It was almost like a piglet suckling at a mother's teat, but there was an obvious lewd nature that struck Inosuke despite his ignorance. Unconsciously, he found himself leaning forward, drawn in by this new sight until Aoi moved her hand over his eyes. That couldn't change the fact that he had already seen so much and could easily hear more, salacious words wafting through the air alongside so many moans. All of it made him more conscious of the woman at his side. Of Aoi.

She was pinned against him, that pleasing weight resting on his muscular frame, and it seemed that she couldn't pull herself away. Whether for his warmth or her inability to move without alerting the others, Aoi stayed there with him, even snuggling up closer as she tightened her grip on him. The more the kakushi continued their fellatio, the more Inosuke noticed a wetness running over the curve of his hip and down his thigh, droplets hot like geothermal spring water striking his skin and rolling downwards like tiny beads. The longer they clung together, the more that nectar ran along his skin, trickling steadily even as Aoi buried her face into his neck and let out a sound of vexation.

As her hands fell away from his eyes, Inosuke couldn't help but see the aftermath of the kakushi's foreplay, Yurie licking at her lips even as Hiro's cock visibly dripped some viscous fluid into the hot spring. Aoi's fevered, frustrated apologies tore his attention from the pair even as Yurie was beginning to clamber onto the edge of the rocks and present herself to her lover, a pose Inosuke grasped more naturally.

"Aoi doesn't have to apologize," Inosuke whispered in that low, gruff voice, a rarity that his volume was so quiet, "Inosuke will protect." He didn't know what he was supposed to protect her from exactly, but he fully intended to do it regardless. Those kakushi seemed fully content to indulge in carnal delight rather than continue their search, so it seemed unlikely that Inosuke would have to drive them off any time soon.

The high, keening cry that flew from Yurie's lips caused Inosuke's vision to snap back to her, eyes widening once again as, instead of the male mounting her, he had buried his face into her loins. "A-Aoi..." he muttered quietly, his cheeks aflame as the lewdness once again bypassed his ignorance, "... I think... they don't know how to mate..." While she wondered aloud about what could be done to stop them, Inosuke found himself frozen in place as Aoi's hand held his turgid length to her thigh, pulsing more firmly now that her palm pressed against his thick shaft. His nostrils flared the more she squirmed against him, the wetness of her sex smearing onto his skin more even as he noticed the swelling of her pearl against him. He certainly could have stopped the pair, but his brain had gone into overdrive trying to process the lewd scene before him and the sensation of Aoi clinging so tight to him.

"You're even more wet than normal," Hiro commented aloud between snacking on his lover's snatch, his lips smacking as he tasted Yurie so eagerly, "I wonder if the medicine they gave you works like an aphrodisiac or something~." He seemed pleased with himself, but rather than waiting for an answer, he simply buried his face back into her posterior, licking feverishly at that dripping cunt. Inosuke watched as Hiro's hand rose up between her thighs, lighting upon some particular sweet spot that caused Yurie's voice to rise in a trilling gasp, her knees nearly buckling the more he rubbed there.

"Hmmpff... he really doesn't know... that's the wrong hole..." Inosuke muttered softly, confused and aroused at the same time as he witnessed the male kakushi drag his tongue further up, teasing at his lover's asshole while his fingers sank into her sex. Still, he couldn't help but wonder if he could make Aoi cry out like that. If touching her in those same spots, doing those things to her would bring her the pleasure it did to this other woman.

"Ooooooo~Aaaahnnn~~~! Hi-iiii-iro! I need it noo-oooow~!" Yurie yowled like a cat in heat, her hips swiveling enticingly. And Hiro readily obliged, rising up on his feet and guiding his member to her entrance. His length sawed over her slit a couple times before he found the proper angle, fitting every inch of his dick into her and causing her to yelp when his pelvis struck her rear.

If it weren't for all the noise that the other pair was making, between their moans and movements, the whispers of their hidden conversation would have been easy enough to notice for someone skilled enough to pay attention to it. As it was, Aoi was more worried that they'd be trapped there no matter how long it took. Inosuke might not have known how to react to it all beyond that instinctual level, but Aoi couldn't help but to tear her eyes from the scene to stare back at him when he did comment. It wasn't like he had to protect her from the lewdness or any real danger, but just his profession itself was touching. He really did seem keen on taking care of her. First with bringing her to the spring in the first place for rest and now with wanting to ease and reassure her when she was obviously flustered.

Both of them couldn't help but to look back and stare with how well Yurie could make noise. The sight of Hiro making out with her lower lips was very clear. As clear as it was that Yurie loved the attention. Aoi could practically feel the heat from Inosuke's face as he puzzled on the sight while being affected by it. "I-I think they know how to mate...They're just taking their time preparing for mating. I-It's part of showing… love. Most times." She answered him back, though she wasn't quite sure how much more to say or explain it. Maybe they really were just horny teens. While she had some idea about foreplay and enough resources and imagination to fill in the rest, the reality of it was a bit different. And she had never quite imagined putting one's mouth to that rear hole or how much it could seem to affect someone.

Aoi vaguely realized that she had directly touched and covered Inosuke, whether by her own instinct or indirectly mimicking the scene. She was slower to realize how it had immobilized the warrior just to hold him still against her.

As he continued to remark on their ineffective mating ritual, Aoi had begun to unconsciously shift and stroke her fingers over his length as she dug her clit more firmly against the bone of his hip. Watching Hiro sinking his fingers into the moaning girl and tonguing her anus had quite an effect on her, unable to tear her own curiosity away. When Yurie's begging finally resulted in getting that cock stuffed into her cunt in one swift stroke, Aoi bit her bottom lip to suppress a sound of her own, shivering against Inosuke and huffing against his neck as she realized how easy it was to stare and want to watch more. How much of a perverted voyeur she was becoming.

"W-We should go…" She tried to reorient herself and sit up a bit, pulling her hand away and bracing her palms against his shoulders. Telltale clapping of Hiro beginning to thrust clapped against the flesh of Yurie's rear as she huffed and moaned. Cold air rushing in between Aoi's body and Inosuke made her whimper softly and want to cower against him, the hard pertness of her pink nipples poking against Inosuke's broad chest. "Maybe we can throw something to the other side and make some noise to distract them?"

"Ooooooh..." Inosuke had responded to Aoi's flustered explanation, nodding slightly as he was educated on foreplay. Between her explanation and the vivid demonstration over in the hot spring, the information managed to penetrate his thick skull and lodge itself in his brain. "I see... so tongue and touch make it all wet," he said as his mind put everything together, receiving far more sexual education tonight than he had over the course of his years. All this new information prompted him to glance at Aoi, eyes running over her naked body as he imagined that the pair in the hot spring weren't some random kakushi but her and him instead. That he was the one making her gasp and moan in such a lurid voice.

His cock throbbed as those thoughts crossed his mind, that unconscious reaction seeming to stir something more primal in Aoi as well, that small hand starting to slowly stroke at his length. Any further comments from Inosuke froze in his throat, biting down on his lower lip to stifle the hum of pleasure that rose from his chest. No wonder this Hiro had been so vocal when his lover began stroking his dick. His hips rocked involuntarily, seeking more movement, more of Aoi, and his teeth his lips tightly sealed, low grunts only occasionally sounding and drowned out by the exuberant love-making happening nearby.

The wetness against his hip only seemed to increase as Aoi shifted her body, not seeming to find a position of comfort as she nestled beside him. As chilly as the night was, it felt good to have her rubbing against him, that smooth friction generating a little more heat, but she seemed even hotter between her thighs, those juices trickling much more as that stiff nub between her thighs rubbed more firmly against his hip. Inosuke trembled as he listened to her ragged breathing and felt her heart beating out of her chest. She too had to bite at her bottom lip to keep the whimpers she was making stifled, but Inosuke was close enough to hear every small sound, feel every shiver in her soft, slender form. The more she rubbed against his hip, the more it dawned on him that Yurie had cried out the loudest earlier when her lover had touched between her thighs, that pearl rolling against his skin no doubt providing quite the stimulation.

"Hnnngg... you're so tight, but I slide in so easily!" Hiro announced with an amused lilt, rocking his hips as he kept his length buried inside his lover, "Maybe you just love having sex at the hot spring? Or is it just doing it outside that's gotten you so randy?" Regardless of her answer, the kakushi grasped at Yurie's hips, guiding the movement of her body as he began to repetitively thrust into her pussy, the light clapping sound of his hips hitting her rear filling the air along with the splashing of the water around his legs.

Shaking her hips lustfully even as Hiro took control and started to firmly take her cunt, Yurie gasped and trilled, requiring a few seconds to even collect her thoughts as his cock filled her up, "Oooh~! I-i..nnnnmmm... I guess w-we'll just-Aahh! Nnnnn~ooooooh... have to... try both... experi-IMENT! Nnggggg..." As if to help confirm Inosuke's assumption, one of Yurie's hands left the rocks on the shore to reach back between her own legs, the brunette throwing back her hair as she touched herself while receiving Hiro's cock.

Inosuke stopped watching when he felt Aoi start to pull away from his body, the chill air of night making it immediately obvious as his skin screamed for her warmth by dotting up with goosebumps, but it seemed she couldn't stand the cold either. His heart beat swiftly in his chest as he felt her press against his side again so quickly, the cushion of her breasts feeling all the more pronounced as she seemed to lean even harder against him. Her hand had fallen away from his manhood, but it still stood tall and proud, throbbing in the air and against her thigh even more than before.

With everything going on, Inosuke couldn't help but stare at Aoi's lips. She was speaking, but the words were indistinct in his mind, going in one ear and out the other. His pale green gaze was transfixed by their movement, the soft pink color, and the flash of her wet tongue darting about as she spoke. Rather than give an answer or response to what she said, he stared daggers into her eyes, moving forward slowly. The hand that had rested on her shoulder pressed to the back of her head, and in an instant, Inosuke was kissing her. His lips were awkwardly placed as unfamiliar he was with the act, but even still it sent a surge of energy through his muscular form. It only lasted for a moment, but his eyes lingered on hers for several seconds afterwards, the sounds of sex a distant distraction.

"S-sorry..." he muttered finally, realizing he had overstepped his bounds and gotten carried away by the lewd display and such intimate contact with Aoi. His free hand began to fumble about on the ground, searching for anything that could be thrown. Grasping about, he managed to dislodge a small rock from the dirt nearby, clenching it in his fist and reaching back to throw.

Hiro convulsed and threw his head back as he suddenly came inside Yurie, his body twitching even as it was clear that he hadn't pulled out. "That was fast," Yurie moaned, still teasing her clitoris, "I'm not quite there yet... keep going!" Before they had an opportunity to go any further or say another word, a sharp crack sounded as a rock struck one of the trees nearby, jolting them out of the sexual state in an instant.

"Oh shit! Ohshitohshit!" Hiro exclaimed before Yurie clamped her hand over his mouth, the naked pair quickly fleeing from the hot spring. Their discarded clothing was hastily gathered up even as they ran naked down the path, not wanting to be discovered.

Once again, Inosuke and Aoi were alone.