Prologue
Dear Mother, Dear Father,
How does it feel up there in the sky? I’m sure you’re watching over me, but I wonder… how do I look in your eyes right now?
“…Ha, what am I even doing?”
It’s a precious day off, and yet here I am, doing nothing but spacing out in my room.
No plans to call my girlfriends or go see them… I’m just lying on my bed, staring at the ceiling.
“…”
As I lie here, I start to feel sleepy and close my eyes.
Ah… it feels so nice. Maybe I’ll just take a nap like this… But the moment I let my guard down, a certain memory floods my mind.
A few days ago… I shared a deep kiss with Aina.
I had told her about a conversation I had with Arisa about deep kissing… and somehow, that led to Aina and me sharing a deep kiss.
Not just a light touch, but a kiss where our tongues intertwined… It only happened once, but that single kiss has been stuck in my head ever since. Every time I think about it, my body heats up, and I can’t help but feel excited.
“…Ha.”
God… why do I get so worked up just thinking about that kiss?
“But… it was incredible.”
A deep kiss… it was completely different from just a light peck.
It wasn’t just about our tongues intertwining. There was this strange sensation, like I wanted her more and more, and even a slightly aggressive urge to devour the girl in front of me. But above all, what captivated me most was the addictive pleasure it brought.
“It was embarrassing, sure… but it felt so good.”
I wonder if… Aina told Arisa about it?
Arisa hasn’t said anything, and in fact, she seems a bit puzzled by how floaty Aina and I have been acting lately. So, it’s clear Arisa doesn’t know yet.
Should I… tell Arisa?
Just as I was thinking that, the intercom buzzed, signaling a visitor.
Who could it be? A delivery, maybe?
I headed to the door, but when I saw who it was, my eyes widened in surprise.
“…Aina?”
It was Aina.
She was twirling her hair nervously, looking adorable—no, wait, she wasn’t supposed to come over today.
Plus, Arisa isn’t here…
The moment I saw Aina, my heart skipped a beat, not just from nervousness but from the excitement that came rushing back, thanks to that memory.
Still, whatever the reason, I couldn’t just leave her standing there.
I invited Aina inside, and she laughed with an “ahaha” before hopping toward me and clinging to me.
“Hey, Hayato-kun. So, um… I just came over! ♡”
“O-oh… hey, Aina.”
She flashed a bright smile, her usual cute grin.
…Damn it. Maybe it’s just my imagination, but her voice sounded so sweet that I could almost hear a heart at the end of her words.
“…Ah.”
“…!”
Aina hugged me, and our eyes locked. A strange atmosphere enveloped us—not unpleasant, but filled with a sweet tension. We both snapped out of it, blushing furiously.
“Uh… haha.”
“…Ehehe.”
We couldn’t just stand there staring at each other in the entryway forever, so I quickly took Aina’s hand and led her to the living room.
“Now that I think about it, is this okay? You just showing up like this?”
“Huh? Oh, yeah, it’s fine. I’m just glad you were home!”
“I see… I’m happy to hear that.”
“…Where’s Arisa?”
“…Oh, uh, she said she’s out shopping with her mom today. So it’s just us.”
“I see…”
“…Yeah.”
…
What is this atmosphere?
Like I thought earlier, it’s not bad at all, but it’s so ticklish and embarrassing… It’d be one thing if it was just me feeling shy, but Aina’s blushing too, which makes it even more awkward… or not awkward, but, like, it’s awkward!
“Hey, Hayato-kun.”
“Yeah?”
“I’m… well, maybe you too, but… we’re super conscious of each other right now, aren’t we?”
“You mean… about the deep kiss?”
There’s no way we could avoid landing on that answer, no matter how much we tried.
The proof? When I asked, Aina’s face turned bright red, and she nodded.
She looked down for a moment, then raised her head, her eyes slightly misty, and said:
“Hey… want to do that kiss again?”
“!?”
It was like the whisper of a little devil.
A regular kiss? We’re used to those by now. But that deep kiss… is it really okay to just do it because she suggested it?
“I-I mean… that’s a dangerous kiss.”
“Eh? It’s not dangerous at all!”
Aina grinned mischievously and stepped closer.
Her off-shoulder top screamed charm and sexiness, revealing the cleavage supported by her bra despite gravity’s pull. And those healthy, gorgeous thighs exposed by her hot pants… everything about her felt so erotic.
In this situation, what’s the right choice for me? I was wondering that when she giggled.
“Haha, you’re getting a bit too flustered, aren’t you? We’ve done plenty of naughty stuff before, haven’t we?”
“W-well, that’s true, but…”
She’s right, but… if we keep doing that, I feel like I’ll break the boundaries I set for myself.
“Then how about this? Let’s make it, like, a special thing. Like a reward for working hard or something. You said you didn’t want to do anything serious until you’re ready to take responsibility, but what if deep kissing is our thing…?”
“…”
It’s… a very tempting proposal.
I don’t dislike kissing them at all. In fact, I think it’s a wonderful way to reaffirm our feelings for each other.
And, like I said, that unique pleasure is unforgettable… I feel like I’m getting swept up in Aina’s pace, but if we limit when we do something so stimulating, maybe it’ll be okay?
“I mean… we’re having a pretty intense conversation here, huh?”
“That’s true! So, what do you think? I’m totally fine with it, and you don’t dislike it either, right, Hayato-kun?”
“Yeah… of course. Alright, let’s do it.”
“Yay!”
So, I went with the flow, and that’s how we settled it.
If we did such a stimulating kiss too often, there’s no way I could hold back in every sense of the word… It might even lead to breaking the ironclad rules I set for myself.
“But, like… if we really, really want to do it sometimes, can we… maybe do it?”
“Why so formal…? Okay, how about we decide case by case?”
“Th-that’s fine by me! But just one time now… how about it, Hayato-kun!?”
Isn’t that kind of defeating the purpose!?
Seeing Aina, who’s been so boldly seductive up until now, blushing to the extreme makes me think she, like me, can’t forget the sensation of that kiss… and it excites her just as much.
“Right now… just once?”
“Y-yeah!”
Well… if it’s just once, maybe it’s fine!
As a high schooler, I want to maintain a proper relationship, but something like this should be okay… Yeah, it’s fine!
Aina’s eyes reflect my own flushed face… It’s as red as the first time I got close to them.
“…”
“…”
Without a word, our faces slowly drew closer.
In the silence, where it felt like I could hear not just my heartbeat but hers too, just as our lips were about to touch, a sound shattered the quiet.
It was Aina’s phone. Checking the screen, it was a call from Arisa.
“Nee-san? We were just getting to such a good moment!”
“…Phew.”
While Aina grabbed her phone, puffing out her cheeks in frustration, I felt a strange mix of relief and disappointment.
“Yeah… yeah, got it. I’ll tell Hayato-kun~”
Thanks to the call with Arisa, Aina’s vibe returned to normal.
“So, here’s the thing~”
Apparently, Arisa wanted to come over too.
She was supposed to be out with Sakuna-san, but the store they wanted to visit was unexpectedly closed, leaving her with free time. When she got home and saw Aina wasn’t there, she figured she was with me and called.
“It’s a day off, and getting to spend it with both of them? I’m pretty lucky.”
“Haha! Hearing you say that makes me happy as your girlfriend♪”
With Arisa’s name coming up, the deep kiss topic seemed to fade… or not. Aina suddenly looked at me again.
The atmosphere turned pink once more, and our faces naturally drew closer.
▼▽
Lately, I’ve noticed something off about Hayato-kun and Aina.
If you asked what’s off, it’s pretty obvious. They keep avoiding each other’s eyes or blushing, like they’re hyper-aware of something.
It’s practically screaming that something happened, but I knew, thanks to a woman’s intuition, that they hadn’t crossed any major line… so I felt reassured.
“If that’s the case… what is it?”
The major line I’m talking about is sex.
Both Aina and I always want to be intimate with Hayato-kun… because, well, why wouldn’t we?
We’re lovers, after all… Both Aina and I love Hayato-kun so much it’s almost overwhelming.
“Hayato-kun… he thinks about our future and cares about us deeply.”
Hayato-kun said he doesn’t want to do it until at least we graduate high school… or until he’s ready to take responsibility.
Even if temptation strikes, I know Hayato-kun will keep his word. That’s why I was sure they hadn’t crossed that line, but still, their recent behavior was really bugging me.
“I have to find out…”
I pulled out my fake glasses from my bag and put them on.
The moment I wore them, it wasn’t like my mind cleared or anything dramatic, but I felt a sense of mission to uncover this mystery.
“Time for Detective Arisa-chan to step in… Wait for me, Hayato-kun and Aina.”
As usual, I was getting hyped up about going to Hayato-kun’s place.
I even blurted out something embarrassing like “Detective Arisa-chan” and struck a pose with my glasses, only to realize an elderly couple walking by saw me.
“Oh my, such a beautiful girl, but so cute!”
“What are you saying, dear? You were like that when you were young, too, weren’t you?”
“Oh, dear, you don’t have to say things you don’t mean.”
“I’m always serious, dear.”
The elderly couple passed by, chatting like that… I felt embarrassed in more ways than one.
“…I want us to be that lovey-dovey even when we’re old. Hehe, maybe we don’t have to worry about that.”
With that, I switched gears.
There’s nothing to worry or fear about… Still, I have to get to the bottom of this strange vibe between Hayato-kun and Aina!
With that resolve, I started walking again.
Unlike Aina, I was dressed casually without showing much skin, but I still got plenty of stares from young guys passing by. Thanks to Hayato-kun, I don’t feel as much disgust as I used to, but I wish they wouldn’t try to hit on me just because I’m alone.
“…Here we are.”
I arrived at Hayato-kun’s place and rang the intercom.
“Welcome, Arisa.”
“Hey, Hayato-kun.”
Hayato-kun greeted me right away.
Not just with words—he pulled me into a hug, showing his affection openly, even though I hadn’t asked for it.
I let out a warm breath, pressing myself closer, not caring about the pressure from my chest squishing against him, just wanting to feel him there.
(…No, Arisa, focus! You have a mission… Well, this is kind of part of it, but! I still have to figure out what’s going on—)
Then, he gently stroked my back.
Ahh… That sent a sweet jolt through my body, making me let out a soft moan I didn’t even know I could make. It wasn’t just the sensation—it stirred a greedy desire for him to touch me more.
“S-sorry, Arisa. I got carried away because I’m just so happy you’re here and ended up rubbing your back.”
“Huh…? Oh, no, it’s totally fine! I want you to touch me more. I’m going to be your future wife, after all!”
No, I’m practically Hayato-kun’s slave.
Of course, “slave” usually has a negative connotation, so I don’t say it out loud much anymore… But my desire to devote myself entirely to him, body and soul, hasn’t changed one bit.
“Is stroking my back enough? Are you satisfied? Because I’m definitely not—I want so much more.”
“We can’t just stay in the entryway forever, right? Come on in.”
“…”
Being told “come on in” with his hand on my waist made my heart skip.
It felt like he was escorting me… Ah, Hayato-kun’s charm just keeps growing! I knew it already, but still!
Love filter? Never having been in love before?
Who cares! I love this guy, and that’s all that matters.
“So, Aina’s… well, you’ll see.”
“Oh?”
In my mind, I was screaming my love for him, but when we reached the living room, I saw my little sister sprawled out on the sofa, fast asleep.
She looked so unladylike, it was almost embarrassing for me. Aina was completely relaxed, sleeping with the goofiest expression.
“Uhe… uhehe… so good… ha!”
“…What happened here?”
“Haha… she, uh, got tired and fell asleep, I guess?”
“…Hmm?”
It’s not the first time Aina’s made a silly face like this, especially when she’s thinking about Hayato-kun… I mean, I get like that too.
But Hayato-kun averting his gaze? That’s odd. It’s like he’s hiding something he doesn’t want me to know.
“…I see. Actually, I’ve been wanting to ask. You and Aina have been acting strange lately… Did you think I wouldn’t notice?”
It’s probably not something shady—I know that.
It’s not just my trust in Hayato-kun, but also the confidence that he’d never do anything to hurt us.
Even if something did happen, he wouldn’t keep it to himself… because he knows that would hurt not just us, but himself too.
“…Uh, well… you see…”
Still, I couldn’t help but be curious.
I felt a bit annoyed at Aina, who was sleeping so peacefully without a care, but I focused on observing Hayato-kun’s expression.
Something definitely happened… but it’s not something bad, that’s for sure.
He’s blushing and glancing at Aina, which confirms something went down between them.
“Hey, Arisa, do you remember when we talked about deep kissing before?”
“Huh? Y-yeah, of course I remember.”
The sudden topic made my eyes widen, but then it hit me—I cut in before he could continue.
“Did you… do it with Aina?”
“…Yes.”
“…”
Seeing Hayato-kun nod with a bright red face, I nodded too, understanding.
I felt relieved it wasn’t anything shady, but at the same time… I was a little jealous. Jealous of Aina, who was still sleeping in this space with me and Hayato-kun.
(So that’s it… That’s why they’ve been acting like that.)
I haven’t experienced a deep kiss yet… but if it’s enough to make even Aina act like that, and Hayato-kun too, it must be something incredible, right?
“I guess it was pretty obvious, huh… Sorry, Arisa.”
“No, you don’t have to apologize. It’s not like you cheated or anything… I mean, Aina’s your girlfriend too, just like me.”
“That’s true, but… it’s also true that there’s a difference now.”
“…Hehe.”
True, there’s a clear difference now!
But I’m not mad or sad—just a little jealous, and it’s really not a big deal… In fact, I owe Aina a bit of thanks!
“Hey, Hayato-kun, you don’t need to apologize or feel bad. I mean, isn’t it normal to hesitate to bring up something like a deep kiss? If the roles were reversed… I’d probably act like Aina too.”
“…Don’t sweet-talk me like that. Just hear me out for now.”
Oh, that “don’t sweet-talk me” just made my inner woman swoon.
Then, Hayato-kun told me how he and Aina ended up deep kissing, and that they did it again just earlier.
"Aina mentioned she'd share it with you in time. She promised to fill you in when you visited, so you wouldn't feel excluded.”
“She’s aware she left me out, huh.”
That aside, the second deep kiss left her so blissful she fell into that happy nap… I get it now.
Like I said, I’m grateful to Aina.
Why? Because this gives me the confidence to suggest doing a deep kiss with Hayato-kun too.
“So, Hayato-kun, will you do it with me too?”
This is my chance… We didn’t get to do it before.
When I proposed it, Hayato-kun nodded, like he’d expected me to say it, and added:
“There’s a difference now, sure, but it’s not like I have to do it with you just because I did it with Aina… I want to do it with you too, Arisa.”
Oh, my inner woman is about to kneel to him again…
I’m so happy… really, I am. Because, you know, you didn’t say you’d do it with me just to make things fair with Aina. You looked me straight in the eyes and said you wanted to do it with me too. That makes me so incredibly happy.
“But… what kind of conversation are we having in broad daylight, huh?”
“Haha, yeah… Arisa.”
“Yes?”
I heard that deep kissing would be reserved for special moments or when we’ve worked hard at something… I don’t yet know how amazing it feels, but if I experience it, will I agree that it’s better this way…?
“Mm…!?”
As our faces drew closer, Hayato-kun and I kissed… but I immediately realized this was different from our usual kisses.
Maybe because of his experience with Aina, Hayato-kun’s tongue naturally slipped in.
There was a fierce intensity, as if he wanted to savor every inch of my mouth, and a boldness that felt like he was trying to claim all of me… Oh, all I could feel was pure happiness!
“Phew…!”
I pulled away to catch my breath… but even that slight distance felt like a loss, so addictive was the sensation.
I get it now… I can totally understand why it’s so easy to get hooked on this feeling.
Above all, it was like being cut off from the world… in a good way, like my body was floating, and a rush of pleasure seemed to overflow from my brain.
“This… is incredible. I can see why Aina was like that.”
“…Seriously, why is it this intense?”
Hayato-kun’s flushed face was so adorable that I asked him to do it again, since he’d done it twice with Aina… And as that blissful moment came again, I wished time could just stop forever.
▼▽
“And it’s like, my body felt so floaty, like I could fly away any second!”
“Right, right, exactly! A regular kiss is already so happy, but when your tongues intertwine, it’s just insane!”
“It definitely got me excited, and my body craved Hayato-kun even more… but it was so blissful.”
“Yup, yup♪ I’m so glad you got to experience it too, Nee-san!”
In front of me, Arisa and Aina were chatting away.
The topic, of course, was deep kissing, and both Arisa and Aina were openly sharing how it felt and what they thought.
As for me, listening nearby, it was beyond embarrassing… but as if sensing my mood, the two giggled and left a space between them.
“Come here, Hayato-kun.”
“Wanna cuddle with all two of us?”
How could I resist such an invitation? Still buzzing from the kiss with Arisa after Aina’s, I sat down between them.
Today… I’m exhausted, but it’s a happy kind of exhaustion. As I thought that, the two snuggled closer, enveloping me in their warmth and softness.
“A deep, passionate kiss is great, but just being close like this is pretty nice too, isn’t it?”
“Yeah… it’s really blissful.”
Even just cuddling like this is exciting, but both of them always seem to press closer, as if saying more, more.
This isn’t anything new for me or them.
We kept chatting for a while… but I couldn’t help it if my gaze kept drifting to their lips.
I mean… come on, it’s not my fault!
Our daily life is already so intense, and now we’ve done something that overshadows everything else with both of them.
(…But seriously, that was wild… That feeling is unreal.)
Like they said, that floaty sensation, like your body’s about to fly off somewhere… it’s seriously addictive.
“…Hm?”
But then, I suddenly felt uneasy about them and stood up.
“What’s wrong?”
“Something up?”
“…”
I stared intently at the two, who tilted their heads and looked back at me.
I wanted to clear up this nagging doubt, so I kept staring, almost as if I’d burn a hole through them… until they couldn’t take the embarrassment anymore and their faces turned red.
“W-what, you wanna stare that much?”
“Is this a signal to take our clothes off or something?”
“Oh, so that’s what’s going on?”
“Then we’ve got no choice but to strip!”
“No, that’s not it!”
I hurriedly tried to stop them as they actually started to undress, but I tripped and ended up falling onto them.
“Kyaa!”
“Ohh♪”
At that moment, a classic lucky pervert moment happened—my hands ended up grabbing both of their chests… and the strange unease I’d felt was completely swept away by the soft sensation.
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