Why is this happening to me...?
This was my first time entering a boy's room.
When we were younger, Kazuki and I used to play together often, so I'd been to his house many times. But back then, neither of us had our own rooms yet, and we certainly didn't see each other as the opposite sex.
A simple desk.
A TV and low table. And Ryosuke's single bed, where he always sleeps.
"..."
I stood frozen in the doorway, dragged here on impulse.
"S-Shito. I..."
"Sorry about that. Marin always gets carried away so quickly."
"That's not a problem..."
"Well, kill some time here for a bit. It's still pouring outside."
I glanced out the window. The rain had intensified since earlier.
"Sit over there."
Ryosuke tossed the cushion aside and pointed to one edge of the low table.
"But still..."
"Kirizaki, do you play games?"
Ryosuke's demeanor was unchanged.
Kirie was the only one aware that they were alone together, and her agitation made her feel self-conscious.
"Games... just mobile games on my phone."
"Action games?"
As he spoke, Ryosuke connected the game console to the TV. The game he suggested was a sequel to one he and Kazuki had played together when they were younger.
"I can manage a little."
"Then it's settled."
Side by side, they gripped their controllers and focused on the screen.
At first, Kirie couldn't concentrate, her mind drifting to Ryosuke beside her and the bed they were leaning against.
But—
"Haha, Kirizaki, you're weak."
"What? You're just used to it!"
"Nah, I've just got a good sense for this. I was pretty good from the start."
"You always say that!"
As they continued their match, Kirie grew increasingly frustrated. She hated seeing her character dominated on the screen, and Ryosuke's smug face after winning infuriated her even more.
She was getting better at controlling her character, and they were having a good match—until Ryosuke effortlessly turned the tide just as victory was within her grasp.
"Ugh, damn it!"
"Hey, Kirizaki, want me to give you a handicap?"
"No!"
By now, she'd completely forgotten that they were alone in the boys' room. Her sole focus was on how to defeat Ryosuke.
Kirie decided to launch a psychological attack and called out to Ryosuke mid-game.
"Hey, Marin-chan, why don't you join us?"
Kirie knew this was a sensitive topic for Ryosuke, so she deliberately brought it up.
"She just says she's happy watching her older brother play, then stands behind him and watches."
"Oh, so you're close?"
"She just gets in the way all the time."
"But you don't get angry easily, do you? You're so kind, Brother!"
"Ugh."
It was just a jab of psychological warfare, but it seemed to have some effect.
"And you even picked a fight with a bully, right? That impressed me. You've got some decent nerve."
"Kirizaki, what exactly do you think of me?"
"Just a big talker."
"Ugh. I'll prove you wrong."
"Yeah, yeah. Good luck, Brother."
"Stop that."
Ryosuke's play visibly deteriorated. Kirie, who had spotted an opportunity to win outside the bounds of fair play, pressed her advantage.
"Marin's so cute, isn't she? She's just like a little brother. And you adore Shito, right?"
Victory was within reach.
At this moment, Kirie hoped Ryosuke's fingers would falter.
"Yeah, Marin's my precious younger sister... But I'm also genuinely in love with Kirizaki."
"H—?!"
Kirie's own control was suddenly disrupted by this unexpected blow.
The finely balanced standoff, which had been so evenly matched, was abruptly decided.
"Nice. I win again."
"Th-that was cheating!"
"Why? You were the one who made the first move, Kirizaki."
"Ugh..."
Ryosuke's calm, unruffled expression was infuriating.
"You thought you could shake me? Not even close."
"You're seriously pissing me off."
"And I love that angry look on your face, Kirizaki."
"W-what—?"
In that moment, Kirie suddenly realized something.
She suddenly realized Ryosuke was sitting right next to her. With their backs against the bed, the two of them were alone in this cramped room, their faces so close.
"I'm serious."
"S-Shito...?"
Ryosuke set down the controller and turned to face her.
Her heart suddenly began racing. It's okay. I'm closer to the door. If it comes down to it, I can run out—
And then...
"Excuse me! Brother, Kirie, aren't you thirsty?"
The door opened without warning, and Marin walked in, holding a tray with two glasses.
"...Huh? Wait, did I actually interrupt something?"
Noticing the close proximity between the two, Marin tilted her head.
Kirie was utterly shaken by the sudden turn of events. Her entire body was pulsing violently, as if her heart had taken over her entire being.
"...Marin," Ryosuke said in a low voice.
"Ahahaha. Sorry, Brother. Here, have some juice."
Marin placed the tray on the table and hurriedly left the room.
"..."
"..."
Ryosuke fell silent. An awkward silence settled in.
Damn it. I missed my chance.
He should have left the room when Marin came to visit. Breaking this silence would take some courage.
The TV showed the standby screen of a game. Its background music rang out obnoxiously in the room.
"Kirizaki."
Ryosuke spoke, his voice unusually serious.
"I'm serious about this. I want to be with you, Kirizaki."
"..."
She couldn't run away anymore.
After such a straightforward confession, ignoring it and fleeing wasn't Kirie's way.
"I... I..."
The tense atmosphere made her throat tighten, her body trembling slightly.
She thought about Ryosuke again.
How should she respond to his confession? How did she really feel about him?
Spending time with Ryosuke had significantly changed Kirie's perception of him.
She had come to clearly recognize that he wasn't just some shallow playboy.
She was certain that if they were to become involved, he would cherish her. He would undoubtedly bring her joy.
But...
"I'm sorry. I..."
Kazuki still lingered in Kirie's heart.
It had been a one-sided infatuation, devoid of any real give-and-take in romance. Yet the weight of all those years spent solely focused on him had become too heavy to discard easily, lodged deep within her chest.
And then...
She still couldn't quite abandon hope.
What if Kazuki's misunderstanding were cleared? What if he learned that it wasn't Kirie who had harassed him, but rather that she had put an end to it?
Then, just maybe, he might turn around and look at her.
"I have someone I like."
The words came out more resolutely than I expected. And with those words, my resolve hardened.
That's right. I can't lie to myself. I like Kazuki. This isn't about logic anymore.
Even if others might laugh at me, this is my true heart.
To follow my feelings for Kazuki.
That, I now believe, is the best path. And it's Ryosuke who made me realize that.
I treated him coldly, but I owe him gratitude. Thanks to him, I was able to break free like this.
Kirie, still seated, looked straight at him and said:
"I appreciate your feelings, Shito, but I'm sorry."
"Got it."
Ryosuke's weak smile made her heart ache. But this was for the best.
"I'd like to be friends with Shito..."
"It's impossible."
"Huh?"
Ryosuke's actions always defied Kirie's expectations.
Even now.
"You can like the others if you want. I just want Kirizaki."
"What—?"
Ryosuke's right hand gently brushed against Kirie's cheek.
The gesture was so natural and fleeting that Kirie froze, unable to move.
"Is it about Kouno?"
At the mention of Kazuki's name, Kirie shuddered violently.
"You can see it when you watch Kirizaki. It's fine. You can keep liking him."
"N-no, but—ah!"
Ryosuke's fingers parted her hair, tenderly touching her ear. The ticklish sensation made an involuntary sound escape her lips.
I need to run. But I can't move.
She didn't understand why.
He's simply touching her with one hand. If she wanted to, she could easily shake him off.
But she can't. She can't tear her gaze away from Ryosuke—
"W-Why me?"
Her voice is pathetically weak.
"I don't know. Kirizaki, do you hate me?"
"That's, I— mmph!"
Her shoulder jerks. Just Ryosuke's touch is draining all her strength. She can't move her body by her own will. It's as if just the small area he's touching is controlling her entire being.
"I-I, I like Kazuki..."
"That's why I know—"
"Mmph..."
So easily, Ryosuke steals her first kiss.
Her mind goes completely blank.
I never imagined this would happen. I should be back from school by now, changing into comfortable clothes in my room, relaxing. I'd have a normal dinner, take a bath, and go to bed.
I thought it would be just another ordinary day.
"Mmm... mmm..."
I'm utterly disappointed in Ryosuke.
Even though he could be forceful at times, I believed he would respect Kirie's wishes. To have her lips taken like this, so roughly...
"–mm... ugh, mmmn?!"
Ryosuke's left arm wraps around Kirie's writhing waist. He pulls her close, completely controlling her.
She's trying to resist.
Pushing against his chest with both hands, she tries to create some distance.
But her arms are laughably weak. To be so easily defeated just from a kiss...
"mm... ha, pfft... mm..."
Kirie shook her head restlessly, but Ryosuke wouldn't let her escape.
He was holding her, but the restraint shouldn't have been so unshakable.
Is it because I'm not really resisting?
No way.
Desperately resisting in her mind, she tried to fight back, but the sensation of his lips melted her thoughts and left her weak-kneed.
A kiss is supposed to be like this...
Ryosuke's lips were forceful, but not rough.
His kisses were tender, like gentle pecks on her mouth.
"Hah... Nngh... Nmm..."
Her body burned with unbearable heat.
Sweat poured down her, her mind drifting.
Trapped in Ryosuke's embrace, her body reveled in the sensation. It was a body completely different from hers. Even though he appeared slender, he was undeniably a man.
Long arms, long fingers. Broad shoulders. A thick chest.
"Ah... Nngh... Nmm..."
Ryosuke's grip wasn't particularly forceful, yet she still felt completely overpowered. If he were to truly exert himself, she wouldn't stand a chance.
If Ryosuke decided to take her by force, he could do it effortlessly.
If he were to pin her to the bed by brute strength, how much could she really resist?
"Mmm! Mm, ah, muh—"
Her breath came out sweet and heated.
Despite being so forcefully taken, she found herself aroused.
A long, lingering kiss.
Yet Ryosuke didn't attempt anything beyond that. He held her close, embracing her back and waist, but he didn't advance further.
Perhaps that was the one relief Kirie felt.
If it's just a kiss... If it's only a kiss...
When this was over, she would make it clear.
Stop this.
This wasn't why she'd come upstairs. She didn't dislike Ryosuke's affection. She was even glad he'd confessed his feelings.
This isn't what I wanted. I'll tell him plainly and leave this house.
If Ryosuke apologizes, I'll drop this matter.
Let's just go back to being ordinary classmates.
Just like before, he'll occasionally bother me, that annoying guy. I'll just casually brush him off. I'll continue my school life as usual.
"Ah... Haa... Nmm... Nn!"
Ryosuke forced open my lips and entered.
His long, powerful tongue. A foreign object.
My body reacted with revulsion at the sensation.
But that feeling was quickly overwhelmed by pleasure.
The underside of my lips, my gums, my tongue. The mucous membrane on the roof of my mouth. This was the first time someone else's tongue had touched me like this, and the sensation was completely different from touching myself.
"Nn... Uu... Nmb... Nuu... Nuu... Nn..."
Let's end this. This is the end. I'll let Ryosuke kiss me until he's satisfied, and then it's over.
"Haaah, pah, ...mmn, mmmgh. Lero... churu..."
Their saliva mixed and frothed, creating a pleasant sensation.
Their tongues intertwined. He sucked hard. He held her close, preventing her from escaping.
"Eh, nheh, fum... nph. Nuuu... nmm..."
Ryosuke's body was heating up too.
He's this aroused just from kissing me...
Kirie's arms had unconsciously wrapped around Ryosuke's back. She was clinging to him, practically begging for more kisses, completely unaware of what she was doing.
Oh, a kiss... I'm actually kissing him.
The realization hit Kirie belatedly.
Kirie was no different from any other person when it came to romantic relationships. She fantasized about kisses and sex, and had mentally prepared herself for the day she'd experience them herself. Still, she'd never been this acutely aware of a man's body before.
I love Kazuki, though...
That's right.
I felt that feeling again just now, more strongly than before—so it's okay. This is just me indulging Ryosuke for now. Just for this moment.
Even this pleasure will fade quickly.
Once I leave here, go home, and a night passes, I'll forget it all cleanly.
Smack, slurp—mmn, mm, mm, mm...
So it's fine if I feel good.
It's fine if Ryosuke strokes me and I feel good, just for this moment. It's fine if I surrender my body.
Mmm, lew, smooch. Nuu... N, pah?
Just as I thought that...
Ryosuke released Kirie's restraints.
"...H-how?"
Kirie looked up at Ryosuke with feverish eyes, unaware that her expression had melted into a soft, pliant state.
"Think about it."
"Huh?"
Ryosuke stated matter-of-factly.
"What I said earlier. About it being okay if you still like other guys. Give me your answer another time."
*****
"You're such a jerk, Older Brother," Marin said bluntly after they'd seen Kirie out.
"What do you mean?"
"You teased her so cruelly. Kirie was putting on a brave face, but I bet she really wanted to have sex."
"Even if that's true, I never intended to do anything. Besides, I never planned on pressing her so soon."
"So it's my fault, then?"
"Your fault, exactly."
"Ah-ha-ha, sorry about that."
After her syrupy apology, Marin slumped against him, clinging to his neck. Her slender body, her still-damp black hair.
"Older Brother, how far did you go with Kirie?"
"Just a kiss, that's all."
"Really?"
"You're being awfully persistent."
"You always lie, Older Brother. I have to check these things... But I see. So Kirie got all worked up just from a kiss, huh? How cute."
Marin grinned mischievously.
"Alright? Don't make any more advances, okay?"
Marin was dangerous at times like this. She had a tendency to dote on her favorite toys until they broke.
"I can't promise that. I want both of you to be happy."
"What about yourself?"
"Isn't it wonderful to have the people I love most deeply in love right beside me? Now that Older Sister left, I'm lonely. You have to take responsibility, Older Brother."
"Right..."
It would be a lie to say I hadn't touched a single hair on this younger sister's head.
But the truth is, I haven't done anything that could be blamed on me.
With Marin, the most I've done is hold her like this. We may not share blood, but we're siblings. Surely this much is permissible.
"–Ngh, ah, Brother..."
Just by holding her slender waist, a sweet moan slips from Marin's lips.
"I love you, I love you so much..."
Marin's back arches stiffly, and she cries out:
"–Ah, ah, aah! Ahh!"
Her body convulses as she climaxes against her will.
"–Haa, haa..."
A sight she'd never show anyone else: the lewd, unbecoming state of my step-sister, her body and mind matured into depravity beyond her years.
"Were you imagining us down there?"
"Yes, I'm sorry... I was imagining you and Kirie having sex, and I got so... excited—!"
"I told you, we didn't do anything. Just kissed."
"Aah, I'm so jealous, Kirie! That's so unfair! Ah, ah—!"
Holding his younger sister as she climaxed repeatedly in his arms, Ryosuke recalled the kiss he'd shared with Kirie.
Her smooth skin. Her innocent lips. Her soft body against his sweat-damp back. Her utterly melted expression—everything about it had stirred him.
But not yet.
Just a little longer until she's fully ripe.
Just a little more—
As he gently stroked Marin's hair, Ryosuke's lips twisted slightly in silence.