Gloomy Outside, Gal Inside ~Dealing with My Step-Sister Isn't Easy~ - Chapter 03: My Sister is Too Naughty

Chapter 03: My Sister is Too Naughty

“Son.”

“What is it, Dad?”

After finishing dinner – with Mom cleaning up and Miu heading to the bath – Dad, who had been watching TV next to me, called out.

~Meow?~

[TLN- For a moment I thought, it was his Dad who said, “Nya~”]

I looked up, wondering what happened to our pet cat Cocoa, who was sleeping between my legs.

“…Miu, really…”

“Yeah?”

“Well, um…”

My dad, who used to do judo and had a solid build, has a very stern face.

If he were to put on sunglasses, he could pass for a mafia boss. But right now, he seems to be struggling to find the right words.

“What’s wrong with Miu?”

“…Huh! I’m not really worried or anything. I trust that girl, and I’ve been trying my best to make sure it doesn’t happen.”

“Yeah.”

“Is Miu… really not involved in compensated dating or anything like that?”

“She definitely isn’t.”

Ah, this topic again, I chuckled.

Originally, Miu was always plain, both outside and inside the house. She didn’t stand out in any particular way. So, I understand why Dad is concerned now that Miu has undergone such a transformation since entering high school, even if it’s limited to her private life.

I can understand those feelings… really understand!

But, Dad… How many times have we had this conversation?

“She already denied it, didn’t she? I understand how you feel, Dad, but let’s trust her.”

“I understand… I do understand! But… she’s really important to me now. I know her public face, but in private, she undergoes a complete 180-degree transformation… And she’s always playing with her smartphone.”

“She’s at that age, of course she’ll use her smartphone.”

“…Is that… really all it is?”

~Meow~

Look, even Cocoa is yawning as if she’s tired of your excessive worry.

“Well, Dad. Miu’s allowance has increased since she became so cheerful.”

“Yeah. I’d give her as much money as she wants rather than her resorting to compensated dating.”

“And you never miss an opportunity to conduct surveys, asking if she has any dissatisfaction within the family.”

“We can’t have family discord. It’s a promise I made with your late mother.”

“…That’s true.”

We became a little melancholic for a moment, but I found it quite amusing when Dad increased Miu’s allowance before.

Considering the possibility of her being involved in compensated dating, he suddenly increased her allowance.

Naturally, Miu was surprised and asked Dad what was going on, to which he honestly vomited out the reason. Miu then drop-kicked Dad, asking him what he was saying in front of me and Mom.

“I would never do such a thing! And what about this appearance… Ugh! I’m not doing anything like that, it’s just some irrelevant selfies I post on Twitter!”

I remember that exchange that took place at the beginning of last year.

But yeah… it’s been over a year since then. It’s quite nostalgic.

“By the way, Miu hands over the increased allowance to Mom to save, you know?”

“Really?”

“Yeah. Hey, Mom?”

“Yes, dear. I’m properly taking care of it.”

See? That’s why there’s no need to worry.

…That being said, I’ve had moments of anxiety too, wondering if Miu, like the gal sisters I saw in manga, might be involved in compensated dating. So, I can’t really say it strongly to Dad.

“Hmm? What are you talking about?”

“Oh, welcome back, Miu.”

Miu, dressed in pajamas, returned to the living room.

Perhaps feeling a sense of exclusion seeing the three of us together, she immediately rushed over to my side and hugged my arm tightly, staying still.

Feeling the sensation of her ample chest enveloped in pajamas, my consciousness was drawn to it, and I felt a slight surge of energy in my lower half.

~…Meow~

Cocoa, lifting her face, seemed to be saying, “Don’t lust after your sister,” as she lightly tapped my thigh with her tail.

“You two really get along well. Look, can you still say anything after seeing this?”

“Mmm…”

“Hey, so what were you talking about?”

Miu, who was left out, is a source of comfort.

Afterward, Mom took Cocoa with her, so I went straight to my room… but for some reason, Miu followed along.

“What’s up?”

“Let’s stay together a little longer.”

She clasped her hands together and said that, so I nodded without thinking.

As soon as we entered the room, Miu took out a manga from the bookshelf and started reading while lying on the floor.

While averting my gaze from Miu, who had her tempting buttocks facing me, I remembered and opened Twitter.

(Oh, found it.)

On Twitter, Miu has, so to speak, a third persona.

The flashy appearance she has now is Miu… That’s something even her friends don’t know, and no one would ever guess that this girl who posts moderately provocative selfies on social media is Miu.

“Hey, Miu.”

“What?”

“…Um, it’s nothing.”

The photo she posted today—it showed her in a state with all the buttons of her pajamas undone, covering the tips of her ample chest with her arms.

With the mask she wears along with her other persona, it truly feels like this Miu only exists on Twitter.

Her name is “Myuu” as well… it’s a simple, but separate, identity.

“Earlier…”

“Yeah?”

“We were talking about whether Miu is really not involved in compensated dating, you know?”

“Again~?”

“Again, indeed.”

“Dad is such a worrywart. I’ll just tell him it’s okay because I won’t do it tomorrow♪”

However, it’s clear that she’s happy that he’s worried about her.

While thinking that her delighted, shy expression is cute, I felt the need to go to the bathroom, so I got up.

“I’m going to the bathroom.”

“Okay~”

After taking care of business in the bathroom and returning to the room, Miu was inexplicably smiling.

Feeling a bit nervous about what she might have come up with, Miu, who had positioned herself behind me, hugged me tightly.

“Capture complete♪”

“…”

She loops her arm under my shoulders and wraps her leg around my waist, so the sensation coming from her is incredibly direct.

Her large breasts pressing against my back change shape depending on Miu’s strength, and since she’s hugging me tightly now, they should be squishing softly… I can’t help but wonder just how soft those big marshmallows she possesses would be if I were to squeeze them. It’s really bad, and I have no choice but to endure it, trying to maintain a calm composure and resist my perverted thoughts.

(Damn it… I should just break free, but I can’t beat my pervy desires that want to enjoy this sensation while pretending to be composed, baby…)

On another note, dear little sister, stop playing with your older brother’s chest… I’ll play with your chest too, you know.

“Hey, Nii-san?”

“Yeah?”

“You were looking at my photos on Twitter, right?”

“…”

Ah… I can easily imagine Miu grinning mischievously behind me.

Well, I just turned my phone over when I went to the bathroom, so it’s easy to see if she wants to… Well, I’m not angry that she saw it, and we’re not engaged in any weird exchanges, so it doesn’t really matter.

“How were they?”

“…Is there anything besides ‘erotic’?”

“You’re so honest.”

By the way, there were quite a few different comments in the replies.

Erotic, amazing, big boba, want to squeeze them, want to do naughty things, where can we meet, and various other messages.

Usually, this kind of attention-seeking behavior is mostly driven by the person’s desire for approval, but Miu is completely different.

“Miu, you’re not really interested in the reactions, are you?”

“Not at all. I just find it amusing to dress up in a way that I wouldn’t show at school or in front of my friends. The more people know the real me, the less likely they are to think that this Myuu is me—so, well, it’s like another form of cosplay.”

“…Cosplaying as a human named Myuu… That’s deep.”

“Right? But, you know…”

“Yeah?”

“I… I like myself as I am now. But it’s enough if only you, Nii-san, know that this me is me, along with Mom and Dad. If only you know, it’s good enough for me.”

“…”

You… if you say something like that, I might just fall in love with you, damn it.

I don’t claim to be a siscon, but I might be an extreme case of it.

“Hey, Miu.”

“What?”

“Want to sleep together tonight?”

“Huh… Is that okay!?”

“Yeah. I’m in the mood for it.”

Sometimes, I have to be a good older brother.

That night, I slept in the same futon with an incredibly cheerful Miu… Unlike her, who fell asleep quickly, it took me quite a while to fall asleep.

Because… you know?

▽▼

“Seems like you didn’t get enough sleep?”

“Yeah…”

The next day, I was promptly pointed out about my lack of sleep at school.

Standing in front of me was my best friend and partner in crime, Toshinobu Murakami… It’s nice that he’s worried about me, but why has he been grinning like an idiot since earlier?

“What happened?”

“Oh, hey! I actually found the ultimate favorite girl!”

“Favorite girl?”

“It’s this girl!”

Saying that, Toshinobu showed me the screen of his smartphone.

It was an image on Twitter, and when I saw it, I swallowed hard.

“This ‘Myuu’ girl is super sexy and cute! She’s the best!!”

“…”

I’ll just pretend I didn’t see it. I have no intention of telling him anything.

[Postscript]

I’ll continue posting every day like this!

I haven’t been writing slightly erotic stuff recently, even though I enjoy writing it for some reason.

I’m getting back into the groove!