It's Tuesday, and the time is past nine o'clock at night.
I'm lying on my bed, restless and frustrated.
Last Saturday, Miki ordered me to abstain from masturbation for a week.
I've obeyed like a loyal servant, and I've been faithfully enduring this challenge for days now...
To be honest, it's brutal. I'm already at my absolute limit.
Even lying here, my penis is rock-hard.
After an experience that intense, telling me not to jerk off is practically impossible.
Just thinking about it briefly is enough to make my cock go full erection. It's starting to interfere with my daily life.
From morning wood to the walk to and from school, class time, and even during breaks. Evening wood, night wood... I'm starting to wonder if I'm erect more than I'm flaccid.
Still, I've been enduring it all for this Saturday, but there's still half of it left. This week feels abnormally long.
This is an unimaginable, horrifying ordeal.
Even now, I can't stop thinking about it, making it impossible to focus on anything else.
It's a complete waste of time. Productivity lost. Mentally, it would be better to just relieve myself and get it over with.
Besides, if I only do it once, there's absolutely no way anyone will find out.
Just as I'm about to act, there's a firm knock at the door.
My body stiffens with a start, but before I can respond, the door suddenly swings open with a clack.
Here we go again, the person who doesn't understand the purpose of knocking, I think, turning around in frustration, only to be startled.
Peering through the gap in the door was Matsuri.
She opened the door, but instead of entering, she stood silently, staring into the room.
What on earth is she doing?
"Wh-what's going on...?" That was all I could manage to say.
Matsuri, still in her usual pink pajamas, stepped into the room without a word. Her oddly patterned slippers clicked rhythmically as she approached the bed where I lay.
Then, she abruptly thrust something in front of my face.
It was a notebook and a problem set.
"This is homework."
"Huh?"
"Do it."
What the hell is she talking about? Why should I do her homework?
"No, why should I...?"
"Because it's an order."
"Huh?"
I was utterly bewildered. Orders? What nonsense is this?
"But you promised absolute obedience to me, right?"
"Huh?"
I always thought she was a bit dim, but now she's completely lost it.
If she were just dumb, there'd still be something endearing about her, but once she starts spouting nonsense, she's impossible to handle.
"So why on earth...?"
"Because Miki said so."
"Miki..."
Miki said that...?
Damn, just hearing the word "Miki" gets me a little excited. I'm way too messed up.
Come to think of it...
I'd completely forgotten, but now that you mention it, she did say something about listening to Miki or whatever.
Ever since then, Matsuri and I have been acting as if nothing ever happened.
It's like we've both tiptoed around the elephant in the room, barely even looking at each other, let alone talking.
Well, that's how it's always been, but lately it's felt even more... off.
Matsuri's sudden appearance in my room to talk with me is highly unusual, and it's surprising.
That said, I'm already on the brink of failing, and I don't have time to waste on homework.
"Miki said if you don't do as I say, you should tell her," Matsuri says.
Gah, I see...
So if I resist here, Miki will snitch on me?
And if I lose Miki's favor, she might never speak to me again.
That can't happen. I have to avoid that at all costs. If that happens, I'll be in tears. Even my penis would be crying.
"...Just lend it to me."
"What, seriously?! Yes!"
I snatch the problem book from Matsuri's hand and stand up.
Already, I feel like a professor.
A math problem set? Yeah, I'll do it. I'll finish it at the speed of light.
I sat down at the desk and opened the textbook.
"Where?"
"Question 2 over there. And the one below it... it's seriously incomprehensible."
Problems like these are child's play.
I diligently scribbled with my pen.
"Wow, you actually listen to me? That's hilarious. I don't know what kind of leverage you have over me."
It's not so much leverage as... she has me by the balls.
With this, there's no resisting.
I thought Matsuri would just leave after that, but she leaned over to peer at my work.
"Is that really true?"
"It's true."
"Hmm, I'll copy it later. Write it in your notebook."
She must have just gotten out of the bath. Her still-damp hair smelled absolutely divine.
Now that I think about it, Miki-chan always smelled really nice too.
Oh man, just remembering it... my groin is getting...
To avoid being noticed, I quickly solved the problem.
To be honest, it was way too easy for me. I could solve it effortlessly, even with an erection.
People who complain about this being "pointless" clearly don't understand.
I finished quickly and pushed the problem set and notebook back.
"Ugh, finally done."
"...I didn't even do anything, and you're still like this..."
"Like what?"
"N-no, nothing..."
Don't give me that scary look, bro. It's not healthy.
I suspect I wouldn't be able to resist him even without Miki's "orders."
Actually, Matsuri had failed her entrance exam and been rejected from her top-choice school.
That day, my parents had chewed me out, saying, "This is what happens when you don't study properly," leaving me half in tears.
So, when I played along and tried to provoke her a little, she exploded with fury.
Looking back, I think that incident might be why she's been treating me even worse lately.
Seriously, what kind of twisted grudge is this?
"Okay then, the next order is~"
"No, no, not another order. Just go back to your room already."
"Uh, Miki's LINE is..."
"Take your time."
Matsuri suddenly pulled out her phone, forcing me to quickly put on a polite face.
Hey, if you're going to report every little thing I say, I won't be able to take this.
Besides, what's with this? Are you still going to hang around?
She acted like she didn't want to talk to me, let alone let me enter her room.
Perhaps because she's currently in a position of absolute superiority, she's been uncharacteristically good-natured lately.
Her recent behavior is downright unnerving—she's been unbearably cheerful.
"Let's do something fun."
"No way."
"Ugh, so boring... Always like this. Fine, then just give me a shoulder rub."
"Absolutely not."
"Heh, you're just saying that because you secretly want to touch me, right?"
"Huh? What are you talking about...?"
"Come on, you're... siscon, aren't you?"
The sudden accusation leaves me frozen in place.
What the hell? Where did she get that from?
"Miki told me."
So it was more than just a hunch. It had to be.
That's a lie, a fabrication. If anything, it's probably just wishful thinking on her part.
Matsuri, apparently swallowing the story whole, gives me a smug, condescending grin.
"Alright, I'll... I mean, I'll let you give me a shoulder rub."
With that, she turns her back to me and plops down onto the tatami cushion.
For some reason, everyone seems to think I'm a siscon, wanting to massage and touch my younger sister's shoulders...
They've got it completely wrong.
What I really want to grab is my own penis. Her shoulders don't matter at all.
Matsuri's nonchalant attitude annoyed me, so I pretended to comply obediently before suddenly grabbing both of her shoulders from behind.
"Ow! That hurts!"
As expected, she shrieked.
"Hmm? What's wrong?"
"You're squeezing too hard, idiot! You're way too worked up!"
No, that's not it at all.
Well, whatever. Let's just say my body tensed up because I was so excited.
I tightened my grip again.
"Stop! That really hurts!"
This time, she slapped my hands away and shook me off.
She twisted her head back to glare at me.
Even the usually good-natured Matsuri is losing her temper now.
If I keep this up, Miki will hear about it, so I should probably stop here, I thought just as...
Matsuri's sharp gaze suddenly softened into a coy, upward glance. Then she spoke in a syrupy-sweet voice, completely unlike her usual self:
"Hey, be nice to me, big brother?"
...What was that just now?
I froze, or rather, I was a little repulsed by her blatant manipulation, when Matsuri smirked.
"Heh heh, it's working, it's working."
"...What's working?"
"You get all excited and happy when someone calls you 'brother,' don't you? Miki told me."
...Ugh. How pathetic. Even my own younger sister.
Just because Miki said so doesn't mean I should fall for it so easily.
Do I even have any willpower left?
If you tell me not to say anything, I'll stop, but for now, let's put me aside.
No, she's really a shallow girl. It's starting to make me sad.
You can't just tell me not to say anything, you know. Really.
"Come on, come on, hurry up, big bro!"
When did she last call me that? It feels like she's just provoking me now.
Knowing that any response would just lead to more trouble, I quietly started massaging her shoulders.
Rub rub rub...
They're so soft. There's no tension at all.
"Haaah..."
Matsuri sighed, tilting her head back and rolling it from side to side.
With each movement, her hair swayed gently, releasing a sweet fragrance.
Rub rub rub...
Occasionally, a glimpse of her pale nape peeked out from the swaying strands.
Looking down, I saw her back as she sat with her legs tucked under her. Her slender waist tapered into rounded hips...
*****
Hmm?
This is strange. Truly bizarre.
This... is a clear sign of the harmful effects of my impossible abstinence.
Something as absurd as getting slightly aroused while massaging my younger sister's shoulders after her bath.
Ugh. This might not be a good situation.
To distract myself, I kept my hands busy and casually brought up a random topic.
"By the way, about that computer... you took it and never returned it, right? Are you still using it?"
"Huh? W-Well, it's not yours, so it's fine."
"Still, why? What are you using it for?"
"N-No! I'm not watching any... suspicious videos or anything like that!"
I never even mentioned videos or anything like that.
Could it be...?
Heh heh heh. I'll check her browsing history later. She's such an idiot; she probably doesn't even know how to clear it.
As I chuckled to myself, Matsuri grew flustered and started babbling.
"Wait, seriously, why was it so... slippery?"
"Huh?"
What a sudden ambush!
There's a complicated backstory to that, you know...
"D-didn't Miki-chan say anything about it?"
"No, she just burst out laughing."
So I guess I didn't spill every embarrassing detail to Matsuri after all.
But that computer at the time...
"...It had tons of porn sites open, didn't it?"
Right.
So it was probably a finished porn video and a bunch of porn sites left open.
There's no excuse for that.
"Y-you... do you always watch... that stuff? And... do that?"
"D-do what?"
"...Y-you know exactly what I mean!"
Yeah, I know, but I don't want the conversation to go in that direction.
Why should I have to explain my masturbation habits to my younger sister?
As I pondered how to answer, Matsuri pressed further.
"Um, so... does it have to be all slippery and slimy?"
Why is she so persistent about this?
Normally, I'd just end it with a disgusted "Ew, gross!" and leave it at that.
"Well, it depends on the situation and how you do it. Some methods work without being all slippery..."
"Hmm... I see..."
After that, we both fell silent.
Somewhere along the way, her hands had stopped massaging my shoulders.
The atmosphere turned incredibly awkward...
After a long silence, Matsuri suddenly whirled around to face me.
"Hey."
"W-What?"
"I want to see."
See what? You mean something like an Elec...trical Parade show?
Confused, I asked her to clarify.
"...Huh?"
"Show me."
"W-What do you want to see?"
"T-That... part."
"...Where it rubs?"
Ah, the friction spot. Hahaha... You got me there.
I froze, staring at Matsuri, whose face was flushed crimson as she lowered her head.