"Haa... It feels like a lot happened today."
After being led by the goddess Nyx to meet the goddess Gaia and returning to the castle, I had finally won my wives' permission to sleep alone for just this one night.
"Honestly... I really need to rest properly tonight."
Dragging my exhausted body to the bed, I was just about to fall asleep when—
Whoosh
"...Hm? This presence is..."
Sensing a familiar presence approaching from outside the window, I pushed myself up from the bed.
"Hello~ My youngest!"
"...Mother."
Before long, the goddess Nyx entered my room through the window.
"What brings you here this time?"
At her appearance, I asked once again why she had come.
"This time, I have a goddess I want to introduce to you."
"...Didn't I already meet the goddess Gaia?"
"Not Gaia. Another goddess. One who will grow deeply connected to you from here on."
"What do you mean by tha—"
At my question, Nyx said there was a goddess she wanted to introduce to me. As I was still wondering what she meant, a woman with long black hair appeared beside her.
The woman who emerged looked strikingly similar to Nyx.
She was a beautiful woman with long, dark hair like Nyx's and blue eyes.
"That person is..."
When I asked about her identity, Nyx smiled and answered me.
"This is Nemesis. Your older sister."
".... Pardon?"
"Hm? Didn't you hear me? This child's name is Nemesis, and she is your older sister."
"Uh..."
"After parting from Gaia, I brought her along so I could introduce the two of you, since she said she was coming to meet you."
Nyx introduced the woman who had come with her as my elder sister, the goddess Nemesis.
At those words, I stood there blankly, having forgotten how I was supposed to react.
"This is the first time I've seen you like this. It's nice to meet you. My name is Nemesis. I am the child of the same mother as you."
"...It's a pleasure to meet you. I'm Astellon."
In that situation, the goddess Nemesis, standing beside Nyx, spoke to me first. Only then did I manage to exchange greetings with her.
We had greeted each other, but the awkward atmosphere did not fade. Noticing this, Nyx personally stepped in and made it possible for Nemesis and me to talk. Thanks to that, the stiffness between us eased somewhat.
"Hmm... It seems the two of you have grown a little closer."
"Yes."
"And as for you, Nemesis... You were so tense earlier, but it seems you've relaxed a little."
"M-Mother?! Why are you saying that all of a sudden?!"
When Nyx brought up something only Nemesis and she had known, Nemesis shouted at Nyx in a much louder voice than she had used with me.
"Why? You were doing exactly that earlier, weren't you? Tapping your feet in place."
"Why are you bringing that up now?!"
"Hahaha..."
"...Astellon."
"Yes, goddess Nemesis."
"...Did you hear that just now?"
"No. I didn't hear anything a moment ago."
"...I see."
Then Nemesis drove Nyx away and turned to me, speaking directly. When I answered with a face that said I knew nothing, Nemesis looked satisfied.
"And..."
"?"
"From now on... there's no need to keep using honorifics. Just... from here on, call me big sister."
"...Pardon?"
At that moment, Nemesis seemed to think of something, then spoke to me with a slightly embarrassed expression. And with that, the calm mask I had been maintaining cracked apart.
"...Why are you doing this?"
"A-ah, it's nothing..!"
"If it isn't that... could it be that you dislike me?"
"How could that be? Absolutely not!"
"Then... could you call me that just once?"
At my reaction, Nemesis made a sad face.
When I hurriedly answered her, Nemesis looked at me with an expectant expression and spoke.
Seeing that face, I could not bring myself to refuse.
"Y-yes... Nemesis... big sister..."
Suppressing my embarrassment, I called the goddess Nemesis "big sister."
"...."
After saying it and looking at Nemesis, I found her staring at me with a dazed expression.
"...Nemesis big sister?"
".....Ah. Cough! I've just shown you quite an unsightly side of myself. Please forget what you saw."
"...Yes."
"And... please keep calling me 'big sister' from now on."
"...Yes, understood. Nemesis big sister."
".... This. Is more effective than I expected..."
"Hm? What did you just say?"
"Ah, nothing. Astellon."
"I-I see..."
"My, my. Have the two of you already dropped the formalities? Hmm. How lovely. The two of you are getting along so well."
At that moment, Nyx, who had briefly gone outside at Nemesis's request, returned and smiled as she looked at me and Nemesis, whose relationship had grown warmer.
"Ah, right! Astellon. Our Nemesis brought something for you."
"Mother!"
"...For me? What is it?"
"Nemesis. Our youngest is curious right now..."
"...I'll accept this favor later. Astellon. I thought it would be rude to come empty-handed, so I brought this..."
"What is it?"
"Ambrosia."
"Ah, is this the Ambrosia I know?!"
"Yes, that's right."
"...This seems far too precious for me..."
"What are you saying, my youngest? Who would say such a thing?"
"M-Mother?"
"If anyone ever says that to you... I will not let that person off. So there is no need for such worries."
At my flustered reaction to Nemesis's unexpected gift, Nyx spoke to me. Then—
"Now, aaah~"
"M-Mother! This... this is really not necessary! I'm not a child..!"
"To me, you're still a child."
She even tried to pick up the ambrosia herself and put it into my mouth. At that, I was more flustered than ever and hurriedly tried to stop Nyx.
But Nyx was already beyond reason, and though I resisted to the end, I ultimately ended up eating the ambrosia she fed me herself.
Watching from the side, Nemesis big sister looked on with a slightly reddened face as she watched Nyx and me.
Fortunately, Nyx only did that once or twice more before stopping. After that, I spent the night talking with Nyx and Nemesis big sister, eating the ambrosia Nemesis had brought, and speaking with them until dawn.
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