The room was dimly lit, as the lights were not turned on.

On the bed, Moonbyul was sprawled out, sleeping like the dead. Taeyang used the light filtering in from the hallway as a guide and perched himself on the edge of the bed. He gently shook her shoulder.

"Moonbyul-ah. Wake up for a moment. You need to apply the medicine before you sleep."

"...."

Moonbyul had a habit of sleeping so deeply that she wouldn’t wake up even if someone carried her away. Taeyang decided it was better to just apply the medicine quietly and leave.

At least he didn’t have to go through the trouble of undressing her.

She hadn’t even bothered to cover herself with a blanket, let alone put on underwear. Her white buttocks were fully exposed. He quietly gazed at them.

However, simply describing them as white wouldn’t do them justice. Her buttocks were bruised blue, far from being in good condition. Moreover, they weren’t just bruised; some areas were bleeding slightly.

Taeyang let out a long sigh.

He didn’t feel guilty, but his heart was heavy.

"...Haah."

Putting aside his trivial thoughts, he opened the first aid kit he had brought.

The medicine was essential to prevent scarring. First, he wiped away the blood droplets on her buttocks with gauze. Then, he applied the ointment to his fingertips and spread it over the bruised areas.

"Huh!"

Moonbyul groaned in pain, and her buttocks twitched. Every time her round buttocks twitched, small ripples formed.

Yet, she showed no signs of waking up, indicating she was deeply asleep.

He carefully applied the ointment all over her buttocks. Looking at her plump buttocks and the line of her thighs, he muttered briefly.

It was a sigh filled with deep regret.

"Sigh. Why does someone like this have to be my sister?"

Finally, he stood up, stroking Moonbyul’s buttocks one last time. The rubbery texture felt like a rubber ball, invoking a desire to keep touching it.

"It would be better if she were just a neighbor’s friend."

Then, he wouldn’t have to feel this way, and he could have taken her without hesitation. He muttered with regret.

If it were just discipline, he would have probably used his cock instead of a golf club.

Taeyang saw his second life as a bonus round of entertainment. However, the bond of blood was truly formidable. He couldn’t bring himself to take their relationship beyond that of family.

Taeyang quietly left the room again.

The room fell silent once more. Moonbyul, with her face buried in the pillow, had her ears flushed red.

"What on earth..."

Her chest felt ticklish, and her lower abdomen was hot.

She raised her hand and gently touched her buttocks. It just stung, far from the melting sensation she felt when Taeyang applied the ointment.

"I wish he would touch me more..."

Her regretful murmur dissipated into the darkness.

*

The next morning, Taeyang woke up early as usual and went to the living room. For a moment, he thought he was still dreaming and pinched his cheek.

"...Huh?"

He wasn’t dreaming. Then who was that person standing by the sink?

No, the neat bob that just covered her shoulders and the classic Coke bottle figure were familiar. It was just the situation that didn’t match.

Feeling his gaze, Moonbyul turned around. She was wearing red rubber gloves and holding a dish.

She pouted her lips.

"What?"

"I was just wondering what got into you."

Moonbyul took off her rubber gloves and said nonchalantly,

"I’m not a kid anymore. It’s ridiculous to leave all the housework to you, oppa."

Of course, she did basic cleaning and recycling, but compared to what Taeyang did, it was minimal.

Taeyang, who had been standing there dazed, suddenly smiled and approached her.

"Moonbyul-ah."

"What?"

Taeyang spread his arms wide and hugged Moonbyul tightly.

"Let me hug you."

"W-wait!"

Regardless of her resistance, Taeyang pulled her into a tight embrace.

Moonbyul found her face buried in Taeyang’s firm chest, unable to refuse. Her hands, with nowhere to go, slowly moved upwards.

This should be okay, right? Thinking so, Moonbyul placed her hands on Taeyang’s back. She hadn’t realized it before, but her oppa’s embrace was so warm and comforting.

They used to have these affectionate hugs often a few years ago... She quietly rubbed her face, feeling a sense of longing.

"You’ve finally grown up."

"...How does doing the dishes make me grown up?"

"At this rate, you might even start cooking."

"...I could."

Taeyang smiled and massaged Moonbyul’s shoulders.

"Forget cooking. Let’s go on a date for a change."

"A d-date! What are you talking about?"

"As soon as school ends today, come straight home. I’ll teach you how to shop for ingredients. It would be a relief if you knew how to shop. Really."

"Oh, that kind of date."

Her momentary excitement faded, but it had been a long time since they went out together, just the two of them.

"And we can eat out too. Do you have any plans after school?"

"No."

Moonbyul shook her head lightly. Originally, there was a class soccer match after school today, but whatever. The striker position was popular anyway, so it would be fine.

*

Leaving Moonbyul, who was picking at her food with a strange expression, Taeyang left the house first. Naturally, high school started earlier.

"This morning, she did all the dishes. I think she grew up a bit overnight. She even said she could cook. I thought I’d teach her how to shop first. I was worried that when she moves out, she’d only eat delivery food, so this is a relief."

I had a hair tie in my mouth as I combed Ahyeon’s hair while she sat on my lap. The sound of the comb running from the crown of her head to her back was soothing, and a faint scent of shampoo wafted through the air.

Even though she could do it herself, Ahyeon always insisted on having her hair combed by me when she came to school. Thanks to her, I had become quite the expert in handling women’s hair.

Her face relaxed, and she giggled.

"Ah, that feels good..."

"Hey, keep your neck straight."

With skilled hands, I tied her hair into twin tails. After finishing with the curling iron, I kissed her lightly on the nape of her neck.

Smack-

"So, I need to go home early today."

"What? Then we can’t play for two days in a row! Do you know how worried I was when you disappeared without a word yesterday?"

"...Didn’t I text you?"

Ahyeon squirmed on my lap, trying to express her discontent, but to me, it felt like a cute tantrum.

"I’m not satisfied with just a text! You should at least call me!"

Then she turned to face me, her face so close that our lips were almost touching. She growled.

"Damn it... You didn’t even come yesterday..."

After a moment of thought, Ahyeon asked,

"Can’t I tag along and make it a threesome?"

"You’re so greedy. What if Moonbyul wants to join us next time we hang out?"

At those words, Ahyeon fell silent for a moment, deep in thought. Her expression hardened, as if she was imagining something cute.

"Tsk, I’ll let it slide because it’s Moonbyul, but in return, I get to have you all to myself until school ends today."

Ahyeon grabbed the collar of my shirt and subtly moved her hips to stimulate my cock. The sensation through my pants was clear: Ahyeon wasn’t wearing any panties today.

"Aren’t you always like that?"

I chuckled, and Ahyeon smiled back, lowering her head. She bit my neck gently, not intending to hurt me.

When she opened her mouth again, my neck was wet with her saliva.

"That’s true. Should we just skip class and go to the rooftop?"

"First, give me the answer sheet you graded yesterday."

"Ugh... Taeyang didn’t even look at it..."

As we were chatting, the class president approached the back of the classroom.

"Tae... Taeyang?"

"Yeah?"

When our eyes met, the class president blushed and quickly looked away. I understood why; my current appearance was quite provocative.

Ahyeon had pulled my collar, exposing my chest slightly, and there was a hickey on my neck. It must have been quite a sight for the ordinary class president.

Avoiding eye contact, she stammered,

"The teacher... wants you to come to the staff room... I’ve said everything, so I’ll go!"

"Oh."

It made sense; skipping the midterm exam without notice was bound to have consequences. I lifted Ahyeon by putting my hand under her armpit and stood up.

"I’ll be right back."

"No! I’m coming with you!"

"Okay, okay."

With Ahyeon clinging to my arm, we headed to the staff room.