I opened the front door, only to find a stunningly beautiful high school girl standing there.

A blonde gyaru and a black-haired girl with an innocent, prim appearance.

...... The gyaru then let out a truly outrageous statement.

"Huh? Didn't you hear? It's okay if we get a bit intimate, so can you let us stay the night?" "...... A-ah, uh... I mean..."

"...... Don't mess with adults. Go home."

As I was about to head out, I tried to step into the room instead. "I'm not joking! I'm serious!"

"If that's the case, then it's all the more unfortunate. I have no such intention, so hurry up and leave."

The one who grabbed my hand tightly was... unexpectedly, the black-haired girl with a reserved demeanor.

"...... Please, we don't have anywhere else to go..." A trembling voice. Black eyes wet with tears.

It felt like there was some serious reason behind it.

...... But even so, I think they're making a mistake by coming to me for advice.

"Hey, old man... don't you remember us?" "Huh? What's with that sudden attitude..."

It hit me like a flash—the blonde gyaru and the black-haired girl in their pairing looked familiar...

"...Sensei Okarin. You don't remember?"
"…………!"
Sensei Okarin.
She had definitely called me that.

"You don't remember Okarin? C'mon... hey, do you?"
...The blonde brat of a girl.
The black-haired, timid little one.
They looked familiar...
No... but...

"...Weren't you guys students at my cram school back in the day?"

Paah...! The girls' faces lit up instantly.
"That's it! That's it! Taiyou-ken!"

Taiyou-ken. That was... the name of the cram school where I used to work part-time back when I was in college.
...Ten years ago.

I used to do private tutoring shifts there.

And at the time... I remembered a pair of twins.

"...Ina Akari. And Ina Nako, right?"

The black-haired girl... Nako, burst into a smile as bright as flowers blooming.
"Sensei Okarin!"

Overcome with emotion, Nako threw herself at me in a hug.

The size of the breasts pressed against me was... completely different from ten years ago.
Big. They were big... no.

"……That's good! You remember me, huh!"

"Aah, yeah…… Nanae. You've grown quite a lot, haven't you?" Height and bust size, that is.

"Hehe~ right? I'm a G-cup big sis now, a G-cuuuup~"

"……A-Akari! Cut it out! Don't say things like that!"

Nanae, her face flushed crimson, shakes her head frantically.

S-so it's true…… A G-cup, huh… That's some size……

"Oh right, for reference, I'm an F-cup~ aha! It's just that the big sister is too big; I've got decent tits too, so please bear with me there."

"……Akari. You haven't changed a bit in terms of being bratty, huh."

"People really do stay the same. Karin hasn't changed at all since then either, right?" The precocious younger sister, Akari. The gentle older sister, Nanae.

The former students I was reuniting with after ten years were……

…Bodies that had grown up, but spirits that remained completely unchanged. It was a little heartwarming to see that. ★

I decided to let the two of them into the house for now.
Even if they were former students, we weren't complete strangers.

Besides, summer was over now, and autumn had set in. The nights were bitterly cold.

I couldn't just leave them out here in this weather.

"How'd you figure out I live here?" the girls asked as they settled onto the sofa.

I should... probably get us some drinks.

"Heh, better not count your eggs before they hatch. You can't underestimate the great Detective Akarino~"

"...Sorry, I just remembered."

"Just remembered? Ah, that's right. We've been in the same apartment complex since college."

After graduating from university, I had kept living in the same apartment building.

"Even so, how did you know?" "...W-Well..."

"Once after Akarin finished her shift at part-time job, we were playing around by tailing her back home with all the cram school kids~ That's when I noticed."

"No way... I didn't know that was an issue." ...Isn't that basically a crime?

But then again, they were just kids doing kid things, right...

“...I, I'm sorry. It felt wrong to just show up like this...”

“What are you talking about? You’re the one who always wanted to know where Akari’s home was.”

“Ah... Akari. You idiot.”

Nanako patted her sister’s shoulder gently. Akari didn’t seem the least bit embarrassed.

Ah, really... it hasn't changed a thing from ten years ago...

It feels like I've gone back to my university days...

“W-was that Akari? Is she crying?”

“Huh? Ah, yeah... I don't know, something about it was just really nostalgic and got a bit on me.”

The water had boiled, so I made an instant coffee and headed back to where the two of them were.

Nanako was overly apologetic, bowing her head repeatedly. “Here, drink it.” “...I'm sorry to bother you.” “You’re welcome♪”

Akari accepted it normally, but Nanako tried to take the cup from my hand while bowing her head over and over. Thud. “Hyah...!” Nanako’s hand touched mine.

In that instant, she blushed bright red and reacted excessively with her whole body.

That was the cause of the coffee spilling. "Woah—ow!"

"Hey! Are you okay, Akari?!"

The coffee splattered onto Akari's cardigan and Nanako's skirt.

"Mm, it's fine~. It only spilled a tiny bit on my cardigan and shirt~. But more importantly, are you okay, Sis?"

"...Y-Yeah. Just the skirt got wet. My skin is fine."

...Relieved neither of them suffered burns. I let out a deep sigh of relief.

"Glad to hear that~. Mmm~ what is it with you, Sis? You're overreacting just because your hand touched my beloved darling~? So maidenly★" "...No! That's not—!"

"And yet, why are your cheeks so red? Uruuru" "...Huuu"

...I was glad the two of them were unharmed, but one wrong move and they would have been burned. "...I'm sorry, Sensei."

"Nah, it's no big deal. Just be more careful next time." Following an old habit, I... patted Nanako on the head. "...!"

"Ah, crap. It was just a habit from the past... my bad."

Tears slowly welled up in Nanako's eyes.

And then she burst into tears again, her sobs raw and ragged.

"Sorry! I'm sorry! Was it... too much?"

"N-no! It's not that! It wasn't like that... It's just... I feel relieved to..."

That was all she could say before the crying took over again. What was I supposed to do with her? ...

"Akari, why don't you grab a towel and some clean clothes for her? She's gotten all messed up."

Akari smoothly stepped in to cover.

"Ah, right. Got it. I'll show you to the bathroom."

"Mm. Thanks. Hey sis, let's go?"