On January 4th, I left the house in the morning to arrive at the sex room by noon. Thinking about what was to come today on the train made it hard to keep a straight face.
The travel time felt long, but when I arrived at the apartment and checked, it was the same as always. I passed through the automatic lock, followed the familiar route, and stood in front of the room where Isla and Nora were waiting.
When I rang the intercom, Isla answered. As I waited for the door to unlock and open, Isla came out of the room.
"Happy New Year."
"...Happy New Year, Isla."
"It's cold, right? Come in quickly."
"Yes. Pardon me."
We started with New Year's greetings. Seeing her for the first time in six days, she was properly acting in case anyone might see her.
Once inside and the door was locked, Isla's demeanor changed to that of a lewd crest slave. With her bowing respectfully, I led her down the hallway to the living room and opened the door.
"Big bro~ooh!"
Someone hugged me with a light impact. Well, I already knew it was Nora.
"N-Nora!? What are you doing to our master!?"
Nora wrapped her arms around my back and nuzzled her face into my chest. Finding her affectionate behavior adorable, I gently hugged her back.
Isla let out a flustered voice at her little sister's sudden actions. She clearly hadn't expected this at all.
"It's an expression of affection for our master. Sis."
"That's not allowed! It's disrespectful to our master, you know?"
"...I-Is it not okay? Big bro..."
Still clinging to me, Nora looked up at me with teary eyes, moisture gathering at the corners. Her expression and attitude—something her older sister would never do—stimulated my protective instincts. As the youngest among the lewd crest slaves, her attack was fresh and resonated with me.
"...I-It's not... not okay, I guess?"
"Master!?"
"Well, I don't have a little sister. This is new for me."
"I-Is that so...? Well, if it pleases you, Master, then it's fine."
"Yay! Thank you, big bro!"
Nora pressed her body against me with a beaming smile. Well, since she and Isla look almost identical, the difference in their attitudes and behavior made it twice as enjoyable for me.
"There there... Alright, are both of you ready?"
"Yes. No issues here."
"Yep. I'm good to go anytime."
"Got it. Then I'll get ready too."
"Understood. Please, this way."
Guided by Isla, who understood without needing to be told, I headed to the bathroom. After she prepared what I needed and left the changing area, I stripped and entered the bath.
***
After cleaning my body and polishing my crotch, I stepped out into the chilly hallway with a towel wrapped around my waist. Having forgotten to decide on the next step, I first headed to the playroom.
Knocking on the door, I heard Isla respond. As expected, they were here. Opening the door, I entered the heated room where the sisters were waiting.
"We've been waiting for you."
"Welcome, big bro."
"...You're well-prepared."
Standing straight to greet me, the two were already in their underwear. Their nearly identical underdeveloped bodies wore the same bra and panties.
Staring at their half-naked forms, I noticed the physical differences were even harder to spot than before. It seemed Yuzuha had grown a little.
"My apologies. It's just... Nora..."
"Sis! Unlike you, I haven't seen him since summer break!"
"...So you couldn't hold back?"
"It seems so..."
"I've been holding back all this time!"
"Got it. Come here, Nora."
Nora happily approached, and I found her unbearably cute. I enveloped her small frame in my arms and gently captured her lips.
As I caressed the fresh skin of the middle school girl, my erect penis, sandwiched between our bodies, grew even harder.
"Mmm... chu, chu~"
"Chu, ah... big bro..."
"Yu... you're so cute... mmph."
I held her tightly, savoring our first kiss in four and a half months. After enjoying simple lip locks for a while, I released Nora from the embrace.
Isla, left out, wore a complicated expression. She probably wanted attention too but didn't want to interrupt her sister's happiness.
While it'd be nice to dote on her next, Isla was always available. Today, Nora came first.
"Phew... Alright, both of you, strip for me."
"Y-Yes, Master~"
"Okay! Big bro~"
They obediently followed my lewd command. First, they removed their bras, exposing their nearly identical small breasts simultaneously.
Isla's nipples were a clean, pale pink, while Nora's were even lighter. Among the lewd crest slaves, their pigmentation was among the faintest.
As I stared at their nipples, their fingers hooked onto their panties. The smooth fabric slid down, revealing their hairless mounds.
Finally, bending over, they stepped out of their panties one leg at a time. If Nanako or Erika did this, their heavy breasts would dangle temptingly, but unfortunately, the flat-chested sisters didn't have that effect.
Unaware of my thoughts, the now-naked sisters stood before me, posing to show off their bodies. I responded by thoroughly admiring them.
The physical differences were minimal before, but now they were even harder to spot. In less than a year, they might become completely identical.
"Hmm... Nora, what are your measurements now?"
"Right now, 76-57-78, A-cup. Oh, and I'm 147 cm tall."
"Wha—!? D-Don't worry! I'm still 1 cm ahead in everything...!"
"...Isla?"
"Y-Yes!? ...Sh-Should I say mine too?"
"Let's see... 148 cm tall, 77-56-79, right?"
"T-That's correct..."
"Yay, I'll overtake Sis soon!"
"Urk... B-But I'm a B-cup! ...Barely, though!"
Watching them compete at such a low level was sad. The next smallest among the slaves was Emily at 85 cm E-cup, and even Jessica (a prospective slave) was 81 cm C-cup.
"Alright, alright. No fighting. ...Now then, next—"
My raging erection was pushing up the towel, and I wanted to sheath it in their warm, slick folds. Glancing at the two futons laid out in the room, I had an idea.
"Okay. Get on all fours on the futons."
"Y-Yes!"
"Okay~"
I watched warmly as they hurried to obey. They split onto separate futons, and I positioned myself behind them.
"Spread your legs a bit more... Yeah, Isla, that's good. Nora, a little more... There, stop."
I decided to compare their pussies—something I'd planned during summer break but couldn't do. I was curious about the differences between these near-identical sisters.