The classroom was bustling with students, but Taeyang and Ahyeon in the back seemed to be in a world of their own, sharing a private moment.

Ahyeon giggled at every word I said, her laughter ringing out brightly.

"Ahaha, really? So what did you have for dinner?"

"She just wanted the food I cooked, so we had it at home. Soybean paste stew, tofu kimchi, and braised beef."

Moonbyul must have been tired; she didn’t have any particular cravings and since we had groceries, we decided to eat at home. I had no reason to refuse, so we just cooked and ate at home.

Usually, she would barely eat half a bowl, complaining about her diet, but this time she finished a whole bowl. Seeing her like that made me strangely proud.

"Oh."

Up until now, Ahyeon had been laughing as if she was hearing a funny story, but when she heard about the dinner menu, her eyes narrowed.

"I see."

Ahyeon’s mouth was smiling, but her eyes were not. A chilling coldness settled over her expression.

Ahyeon, with her already sharp features, made everyone around her shiver with an inexplicable chill whenever she made this face—everyone except Taeyang.

"And then?"

"I tried to get her to talk, but she clammed up like some kind of independence fighter. So I took out some soju from the cabinet..."

"Soju? You drank soju!"

"Not much, just about a bottle and a half? Anyway, she spilled everything after that."

Ahyeon brought her thumb to her mouth and started chewing on her nail. Hey, I told you not to do that because it ruins your nails.

"That little brat finally showed her true colors."

"Hey, isn’t that a bit harsh? She’s not that... Well, she’s not entirely innocent. Anyway, I told you not to bite your nails."

"That’s because you don’t know, Taeyang! Last time I went to your place, that cheeky little..."

"Hey, watch your language."

I rarely got serious, but I nipped Ahyeon’s neck sharply.

Of course, I didn’t bite hard enough to hurt; instead, my lips hid the tongue that relentlessly teased her neck.

"Ah! Haah!"

When our lips parted, Ahyeon’s neck glistened with saliva.

"Let’s get along, okay?"

"Hmph... Okay."

Sure, her words might have been a bit harsh, but whenever Ahyeon visited our house or the neighborhood and ran into Moonbyul, they would greet each other warmly and chat away. It wasn’t so bad.

"So, Taeyang..."

"Hmm?"

Ahyeon glanced around briefly.

The other students nearby were too engrossed in their own conversations to pay any attention to us. She lowered her voice to a whisper.

"If Moonbyul sees you not just as her brother, but as a man..."

Ahyeon looked at me with a slightly downcast expression.

"What would you do?"

"I’d accept her."

"As a woman?"

"Of course."

I answered without a moment’s hesitation.

I only refrain from making a move because of our familial bond and the shock it might cause Moonbyul. But if she honestly confesses her feelings and approaches me, there’s no reason to push her away. Of course, it’s not just about accepting her; some education would be necessary. Anyway, I have more than enough room in my heart to accept my cute little sister. But a sudden question popped into my mind, and I furrowed my brow.

"If I accept her, what will you do?"

Depending on her answer, I might need to scold her.

Ahyeon grinned and replied,

"Obviously, I won’t have to worry about anything and we can have a good time in your room. Hehe, I’m so excited. Really. Your room will be filled with your scent."

It seemed there was no need to scold her after all. I never expected that to be her goal. Ahyeon always surprises me.

But my scent... I casually lifted my hand to sniff my sleeve. There wasn’t any particular smell, but I still felt a bit uneasy.

"...Do I really smell that much?"

"It’s pheromones! Super attractive pheromones~"

She pressed her nose against my chest and took a deep breath.

"Haa... The smell of yogurt. I want to get pregnant..."

Despite her age, she still pronounced "yogurt" like a child.

She puffed out her cheeks and grumbled,

"I can’t wait for Moonbyul’s retreat every year! She could sleep over at a friend’s house, but she always comes home before dawn."

"Of course. I won’t let her stay out overnight. She’s too young to be sleeping over at someone else’s house."

Ahyeon blinked in disbelief.

"Staying over? We did that when we were much younger. Hmph!"

"Shush."

Moonbyul and I are different. But explaining it would be too complicated, so I just silenced her.

I pressed my lips to hers, stopping her chattering.

The kiss in the classroom was brief, not daring to go further. Our lips parted.

"She and I are different."

Ahyeon quietly responded to my words.

"Mm-hmm... You’re right, Taeyang."

With a half-dazed look, she bowed her head and pressed her forehead against my chest.

Always so confident and lively, but a simple kiss could make her melt. If I went any further, she might not even seem human anymore.

"Hah..."

Ahyeon continued to press against my chest, letting out a sweet sigh. It was a sign that she was aroused.

I stroked her back and whispered in her ear,

"Can’t hold back?"

"No... Yes. I can’t, but I will."

Her murmur was filled with resolve.

*

Ahyeon finally calmed her racing heart and looked up at Taeyang again. She still looked dazed, but much better than before.

"I’ll definitely hold back today."

"Because of tomorrow?"

"Mm-hmm."

She smiled with her eyes and flicked her tongue.

A date just for the two of them. Of course, they enjoyed dates six days a week, but this one was special. A date where she could take the lead and make everything happen just the way she wanted.

"I’m so excited. I couldn’t sleep at all last night."

Indeed, looking closely, there were dark circles under Ahyeon’s eyes.

"You might collapse during the date if you don’t get some rest."

"That’s why I’m going to sleep during class today. You’ll lend me your thigh, right?"

"Of course, it’s all yours."

"Hehe, yay...!"

Ahyeon, who had been sitting on Taeyang’s lap, stretched a little.

"You can look forward to it. I’ll make it a memory you’ll never forget."

Whether they were in a freezer or anywhere else, as long as they were together, it would be fun. Taeyang laughed, making a joke.

"I’m really curious. As long as it’s not a 24-hour motel sex date or something..."

"Uh..."

"Hmm?"

"Oh..."

Ahyeon turned her head slightly, avoiding his gaze.

"I thought it was a... good idea..."

Taeyang, trying to be as gentle as possible, let out a short sigh and declared,

"...No, change it."

"Okay..."

Still, Ahyeon seemed to have some lingering regret about the 24-hour sex date.

"It would have been so much fun..."

she muttered softly.

After that, Ahyeon really did sleep through all the morning classes. Right on Taeyang’s thigh. And after serving as a pillow for so long, his thigh started to go numb.

Especially from the middle of the third period, it became critical, but seeing Ahyeon sleeping so peacefully, he couldn’t bring himself to wake her.

*

After school, Taeyang and Moonbyul had dinner together and chatted about various things, from trivial school events to...

Moonbyul paused, her chopsticks mid-air, and furrowed her brow.

"A date with Ahyeon this weekend?"

"Yeah, I’m not sure about the overnight stay... Ahyeon is planning the schedule."

"What kind of sloppy date is that...?"

"Here?"

"What?"

There was still some rice left in her bowl, but Moonbyul shoveled it all into her mouth and stood up.

"...I’m full."

She put the empty bowl and utensils in the sink.

In the past, she wouldn’t have said anything and would have left the dirty dishes on the table. She had truly reformed. The word "reformed" couldn’t be more fitting.

Just as Moonbyul was about to enter her room, she paused with her hand on the doorknob and turned to look at Taeyang.

"What?"

"...Then keep next weekend free. I’ve got dibs."

Without waiting for an answer, she quickly went into her room. At first glance, her attitude might seem sullen, but seeing her ears turn bright red just before she entered her room made her look adorable.

Taeyang replied to the already closed door,

"Okay."

Moonbyul leaned against the door inside her room.

Her face was already flushed so red it looked like it might burst. She muttered softly to herself,

"I said it..."

She was so exhausted she couldn’t even stand, sliding down the door to sit on the floor. She placed her hands on her cheeks, feeling the heat radiating from them.

She had been so nervous about saying that one sentence. But now, filled with the joy of success, she smiled.

"I did it..."

The thought of a real date, not just yesterday’s shopping, made Moonbyul kick her feet in excitement.

Taeyang finished cleaning up and lay down on his bed. It was a bit early to sleep, considering tomorrow was the weekend, but he wanted to rest up for the date.

Just as he was about to drift off to sleep,

Buzz... Buzz...

His phone on the nightstand rang.

His phone was usually on silent mode, with no vibration. There were only four contacts that could bypass this setting: his parents, Moonbyul, and Ahyeon.

He knew who would be calling at this hour. Checking the number on the phone, he chuckled.

[Ahyeon♥♥♥♥♥♥]

"...When did she add more hearts?"

Just a few days ago, there were only two hearts. What was so urgent that she had to call at this hour? A bit worried, he answered the phone.

"Hello?"

[Hey, Taeyang! Were you sleeping?]

"I was about to. We have a date tomorrow."

Ahyeon laughed happily at his words.

[Right! We have a date tomorrow! Tomorrow!]

She emphasized "tomorrow" particularly.

[But do you know what time it is?]

Taeyang checked the time on his phone.

"It’s just one minute till midnight... Oh, it’s exactly 12."

As he spoke, the clock struck midnight, marking the start of Saturday. Ahyeon exclaimed excitedly,

"The date starts now! Come out quickly!"

"Huh?"

Taeyang was taken aback, letting out a dumb sound. Of course, the date was supposed to start on Saturday, but...

"Where are you?"

"Where do you think?"

Even through the phone, he could imagine Ahyeon’s playful smile.

Ding-dong—

The doorbell rang at the same time.

"I’m at your front door!"

Taeyang’s mouth fell open in surprise.