Even after three o'clock in the afternoon, the summer sun still hung high in the sky, showing no sign of lowering. The beachgoers remained as numerous as ever.
Kirie's group enjoyed the sea freely, sometimes gathering around their base umbrella, sometimes splitting into smaller groups.
"Speaking of Shito, where is he?"
"Probably off hitting on girls."
The boys exchanged half-joking remarks.
Meanwhile, at that moment, he was—
Aika was climbing the quiet path leading to the inn.
This was private property—the inn's grounds—flanked by meticulously maintained forests on both sides.
The overhead canopy of branches provided ample shade, and the rustling of leaves in the breeze made it feel like a completely different world from the nearby beach, refreshingly cool.
She had left the group and climbed this gentle slope because—
Ryosuke-kun...
A little earlier, she had accidentally seen him walking toward the inn. He was acting independently of Kirizaki Kirie, and no other boys were with him.
Impulsively, she almost went after him right away, but her "boyfriend's" presence prevented it. Seizing the opportunity of his absence, Aika had secretly come here to search for Ryosuke, avoiding prying eyes.
She was dressed casually, just a parka over her swimsuit, with a tote bag slung over her shoulder. Her fair skin, even on the beach, still drew attention, and her black hair was tied in a ponytail.
Along the way, as she crossed the prefectural road, she noticed, as usual, that she was turning heads among the men.
Fortunately, now there was no one around, and no cars passing by.
"Ah..."
From the direction of the inn—down the hill—Ryosuke was descending.
He was wearing a T-shirt over his swimsuit, with only a body bag for luggage. Without his usual sports cap, he was easily recognizable.
I wonder what he's doing here...
It didn't look like he'd come back for something he'd forgotten.
He seemed to have noticed her too. Even at a distance, she could tell he looked suspicious. Still, Ryosuke walked straight over and asked bluntly:
"What do you want?"
"Uh... no..."
When he asked, Aika found herself speechless.
Aika didn't have any particular purpose. If she had to put it into words, it was simply because her body ached so terribly.
"Um..."
His gaze was cold, but even so, it made her core burn far hotter than when other men looked at her. The heat seeped into her mind, threatening to boil away all reason.
"I want to go back to the others."
Ryosuke's coldness wasn't new.
Ever since he took her virginity, she'd known he felt nothing for her—she understood and accepted it.
Still, it was enough.
He found that ugly, lewd part of her and dragged it to the surface. Being with him made her realize just how shameless a bitch she was—and that was good.
"You're going back to Kirizaki-san's place, aren't you?"
"...Yeah. Did Marin tell you?"
Aika's mind conjured an image of Kirie.
No one else on the trip knew about Ryosuke and Kirie's relationship, so they acted like ordinary classmates.
But Aika could clearly see that the connection between them was different from that of ordinary classmates. Even if she hadn't known beforehand, she would have noticed it.
Yet strangely, Aika didn't feel envious.
I see... So I really am...
She confirmed her true nature once more. Then she realized that the fluttering in her chest and the ache in her gut were growing infinitely stronger.
Aika smiled at Ryosuke, then deliberately removed the shushu as if plucking it off.
"Ryosuke-kun, come with me..."
She took his hand and led him into the forest.
*****
Aika... Where did she go?
Kazuki realized his "girlfriend" was nowhere to be seen.
"Hey, have you seen Aika?"
When Kazuki asked his classmates, they said they last saw her walking toward the prefectural road. He tried contacting her on his smartphone, but there was no response—she must have had it in her bag and didn't hear it.
Maybe she's feeling sick...?
If only she'd told me first.
This would be bad if she caught some kind of "bug."
She's such a handful.
Sighing and shaking his head slightly, Kazuki left the beach to search for Aika.
*****
"What's this all of a sudden...? Are you that in heat?"
Aika dragged Ryosuke deep into the forest, then dropped to her knees, pulled down her swimsuit bottoms, and lunged at him.
"Want me to be your 'boyfriend'?"
"Ugh... Ugh...!"
Aika moaned deeply, taking his penis deep into her mouth and vigorously shaking her head.
"Mmph, mm... N-no, Ryosuke-kun, only you do things like this... Nnngh, mmm!"
"I think I told you before, I'm serious about Kirie. This kind of thing... it's just annoying."
He forcefully pressed down on her head, but she clung to his waist with both arms, refusing to stop her oral service. In fact, her arousal seemed to grow.
"Mmmk, mmmk... Mmph, gup!"
She continued the vigorous up-and-down motion of fellatio, completely ruining her outwardly proper appearance with this lewd act.
"It's pretty bad, keeping something like this from your boyfriend."
At his words, Aika flinched, froze mid-motion, and looked up at Ryosuke, her lips still clinging to his glans.
Her expression said it all: Who do you think you're kidding? It wasn't so much anger as sheer disbelief.
"I'm serious about her. I'd never let her see me like this—this pathetic. I'll keep it hidden. I'll keep it hidden and make her happy."
At that, Aika finally pulled her mouth away from his cock and muttered softly, "That's so unfair..."
"I know. That's why I keep seeing you like this—during sex, you keep quiet, don't you?"
"..."
"If I said I wasn't going to have sex with you..."
"N-no! No!"
Aika stood up and clung to Ryosuke's chest.
"Let's do it, then? I'll make it so good for you—"
Ryosuke chuckled. "Alright, alright."
He pressed her hands against the trunk of a tree and entered her from behind.
Aika trembled with delight.
"Ah! Ahh! This... I've wanted this for so long—more! More!"
Her black hair flew wildly as she writhed.
Ryosuke leaned over her, whispering in her ear.
"What would happen if Aika knew something even better than sex?"
"What do you mean?"
"Marin did something to you, didn't she?"
"Huh—?"
"No, I haven't heard anything from her. But I can tell. She's just like me—"
Aika tensed, but Ryosuke continued whispering in her ear.
"Aika could feel even better than this, without even having sex."
"Huh? Huh...?"
"I'll teach you a way to feel even better."
"...?!"
Though bewildered, Aika shivered with anticipation for this unknown pleasure.
Ryosuke left the condom inside her, made her pick up her tote bag, and rummaged through its contents.
*****
Kazuki couldn't find Aika near the beach and, growing worried, headed toward the inn.
Sure enough, he ran into Aika on a forest path, coming down the hill.
"Aika, you had me worried sick!"
Relief and a hint of indignation that she'd disregarded his concerns surged through him as he ran to her.
"Huh...?"
Something felt off. Her hairstyle was different, but beyond that, there was something... something definitive that made her seem different from her usual self.
"Ah, Kazuki-kun."
Ignoring his confusion, she smiled happily—a smile that somehow made his chest flutter.
"I was thinking about how I wanted to see you. And then... I found it. I really did drop it here after all."
She picked up the hair ribbon caught in the nearby bushes—the same one that had been holding her black hair in place until just moments before. Kazuki had given it to her.
Glancing sideways at Kazuki, who was utterly bewildered, Aika didn't put the ribbon back in her hair. Instead, she tossed it into her tote bag.
Then, she took out her smartphone and smiled sweetly again.
"W-what's going on...?"
"I've been wondering all this time what kind of expression you'd make, Kazuki-kun... I was really looking forward to it. I never thought we'd run into each other so soon."
The conversation wasn't getting anywhere. Kazuki was flustered, but when he saw her smartphone, a sudden surge of anger welled up inside him.
"Hey! Aika's my girlfriend! You shouldn't just up and leave without telling anyone, or not answer your phone... You really need to be more careful about stuff like that!"
His voice cracked as he berated her, but Aika showed no sign of being affected.
"She... yeah, that's right. She's my boyfriend. So... Kazuki-kun, you'll see all of me, won't you? You'll accept it all, right?"
I have no idea what she's trying to say.
"Listen..."
Her face flushed crimson as she gazed at Kazuki with feverish intensity.
"Ugh..."
I'd never seen her look like this before. Overwhelmed by the intensity of her aura, Kazuki flinched.
"I was just having sex."
For a moment, Kazuki couldn't process what she was saying. Aika pressed on relentlessly.
"Out there... In my swimsuit. He took me right there."
"W-What are you talking about?"
"He took my virginity. Not today, though. It happened a long, long time ago. He taught me so many wonderful things. I served him in every way I could—"
"But today, he told me there's something even better. So... can I try it?"
Kazuki's confusion spiraled further.
Facing a lover who seemed like a completely different person, he froze completely.
Aika held out her smartphone screen to him. Naturally, Kazuki's gaze was drawn to the display.
It was a video.
On the screen, Aika was engaged in sex, just as she had confessed.
"Huh? Uh... what...?"
Was it in a forest? She lay on her back on the ground, writhing lasciviously. He was seeing her breasts for the first time. No, even worse, the area where someone's penis was thrusting into her—
Of course, there was no room for joy. The woman on the screen was pleading with another man, her voice sweet and desperate, her face flushed and disheveled.
"More... more..."
"Sex with him is so good. It felt good from the very first time, even though it hurt so much... but it was worth it. He sees all my dirty parts and torments me."
With her other hand, she gently caressed her lower abdomen. Clear trails marred her white thighs—traces of something unmistakably not sweat.
"Here, you see?" she murmured. "This is where he inserted his penis and tormented me. He watched me, punishing me, as I cried and climaxed."
"Who... who the hell is this guy?!" Kazuki roared, his voice cracking. "What kind of sick bastard is he?!"
"It's been going on for a while," Aika said softly.
So... one of the trip members? Kazuki thought, his mind racing. But who? I have no idea...
Those bastards...!
Kazuki seethed, refusing to acknowledge anyone around him.
"This is cheating!" he snarled.
"Cheating?" Aika replied calmly. "No, it's not like that. It started before I even met you, Kazuki-kun. By the time we first spoke... this place had already been thoroughly loved by someone else."
The video cut to a new scene.
The position had changed. Aika braced herself against the trunk of a tree, impaled from behind. Her moans were shameless, yet tinged with a playful bounce despite the apparent pain. She looked utterly delighted—like a lover.
"Ugh... Ah... Ah?!"
The video ended.
Aika smoothly withdrew her hands.
"Hey, Kazuki-kun. This is the real me. What do you think?"
Her expression was bashful, utterly unlike the woman on the screen, pure and innocent like a young girl's.
"T-this... this can't be real!"
"You're my boyfriend, but you won't accept me... Huh?"
Suddenly, her gaze dropped.
"Kazuki..."
"Huh? Oh, uh...!"
Accused by her, Kazuki finally noticed the bulge in his swimsuit.
"N-no, this isn't...!"
He bent forward, trying to flatten it, but the blood only rushed there more thickly.
Aika narrowed her eyes, her voice dripping with contempt. "Did you get hard watching 'her' have sex with another man?"
Her tone was mocking. "I didn't show you that to arouse you, Kazuki-kun."
"Ugh...!"
The unfamiliar tone of her voice and the intensity of her gaze made Kazuki's legs tremble uncontrollably. He sank to his knees, groaning.
"Aika...?"
She crouched down to meet his gaze. "Did you... come? Did remembering me having sex do it? Or... Oh, I see. So Kazuki-kun is just like me after all."
Her giggles were infectious, and he couldn't bring himself to resist.
"Your swimsuit is dirty now. It reeks."
"A-Aika..."
"Don't touch me."
Her hand, reaching out, was firmly stopped.
"I don't have sex with Kazuki-kun, you know? No kisses, no hand-holding. But I suppose I can at least watch... Look over here, okay?"
Aika was holding her smartphone, camera ready.
"S-stop...!"
"Hehe. I'm kidding. I'm not filming. I wouldn't record Kazuki-kun coming..."
Her scolding made his hips tremble. His semen flowed out in spurts.
"Thank you, Kazuki-kun. I get it now. It's not just being watched that feels good... Watching someone else like this is so pleasurable too."
"Huh...?"
"You came a lot, didn't you? Ejaculating felt good, didn't it?"
With that, Aika stood up, smiling brightly.
"Shall we go back to the others?"