Believing She Has Been Reincarnated into a Baseball Game, My Little Sister Is Aiming for the Koshien, While I Give It My All to Keep Her from Finding out That It’s Actually an Ntr Game - Chapter 63

“Riko! Open up!”

“I won’t open it! Riko is currently writing her mochi-mochi farewell letter! Please do not disturb!”

After explaining the plan to Maika, we quickly made our preparations and began knocking on Riko’s door. Of course, there was no way stubborn Riko would simply open it for us.

“It’s not right, Riko! Think about it—committing ‘suicide to be my number one’ is blatant NTR from Yogi Souta’s perspective since he’s totally into you! If he finds out, it’s game over, with this world ending in a Sub-Heroine NTR route!”

“That’s great news! You’ve enlightened me, big brother! Now Riko can die without regret!”

“Damn it…!”

Slipping up like this… was all part of the plan. This was just a preliminary move in the strategy we were about to execute.

Anyway, everything was in place. Now we just needed her to listen.

Although the plan didn’t necessarily require a face-to-face interaction, it was crucial to be direct about this. What we were about to discuss was that important.

“Alright, I’ll listen to you! Just keep it a secret from Maika… and only up to a point!”

After a few seconds, the sound of a lock clicking open echoed, and the door slowly creaked open—

“Big bro—”

“As if I’d ever let that happen. ‘Only up to a point?’ What do you even mean by that? I’d never allow such a thing.”

At that moment, Maika slid the head of a metal bat into the room. Riko tried to close the door in a hurry, but it was too late. The bat caught in the doorway, preventing it from closing.

Together with Maika, I grabbed the bat’s grip and called out to Riko on the other side of the door.

“Give it up, Riko. It’s come to this; it’s a test of strength now. There’s no use resisting.”

“…I hate you, mean big brother…”

“You can hate me all you want if it means protecting you. I lied. Please, don’t hate me.”

“Riko was lying too. I still love my mean big brother. Even though you always make me suffer… I’ve always loved you.”

“Riko…”

Her face and voice seemed resigned, weak. Slowly, she let go of the door.

“Riko, Maika has something she wants to tell you. Will you listen?”

“Kugo and I are having a baby.”

“…Huh?”

“I said, I’m carrying Kugo’s baby.”

“…Meaning…?”

“There’s a baby, Kugo’s baby, in my belly.”

“…Huh?”

“I won’t apologize. Apologizing would be disrespectful to this child. So please, celebrate with me, Riko.”

Riko and Maika were seated on cushions, facing each other.

As Maika spoke, she gently caressed her belly, looking Riko straight in the eyes. All Riko could do was stare back, completely stunned. Even I, sitting beside them, held my breath, taken aback by my wife’s unwavering resolve.

“…W-what is going on, big brother…?”

Even though I planned to just observe, Riko’s bloodshot eyes turned towards me, forcing me to face her. Damn it, of course she’d ask me. I can’t keep running away from this.

Taking a deep breath, I locked eyes with Riko and said,

“I’m sorry, Riko. I broke the no-mochi-mochi rule you set for me—just once.”

“…Big brother…!”

“Maika tried to stop it. She didn’t want to betray you, but I just couldn’t hold back… Being faced with the golden, seductive Maika… I lost control. And of course, not using protection is entirely my fault.”

“That’s not right, Kugo. Even if you cover for me, it doesn’t make me happy at all—it just makes me feel frustrated. This is the baby I wanted. Even that day, we stayed connected the whole time without moving, just passionately kissing, and you were—”

“Stop! Don’t tell Riko all those specific details!”

Riko screamed while covering her ears. Yeah, no kidding, such specifics aren’t necessary right now. This is a serious moment, and I’m already getting aroused. Good thing I’m sitting down. And thank goodness I’m not that big.

“Why is big brother getting hard at a time like this?! And what on earth is the ‘golden seductive age’?!”

This wasn’t good at all. Even without being big, she noticed. What’s the point of having a small one if it still gets noticed? And even I can’t explain what the ‘golden seductive age’ is.

“Riko, listen carefully. This is really important. Probably the most important thing in our lives.”

In stark contrast to me and teary-eyed Riko, Maika remained calm and serious. She reached out and gently took Riko’s hands, which were still covering her ears. She spoke softly yet firmly,

“I’m going to have this baby. I’m going to be happy with this child in this world. So please… Please, don’t let this world end.”

“—”

As if persuading her, yet at the same time pleading, Maika held Riko’s hands in hers, speaking with conviction.

Riko, whose hands were held by her sister, widened her eyes, unable to say a word.

Even so, Maika continued to wait, looking directly into Riko’s eyes, for a response.

“…”

Riko remained silent. Or rather, she probably couldn’t find the words. She opened her mouth a few times, but only faint breaths escaped.

From here on out, it’s my turn. No, I need to be involved. As a brother, as a husband, and as a father.

“Please, Riko. Maika is carrying our baby. If this world were to end now… If Maika were to return to the original world… The shift in her hormonal balance could have drastic consequences. Her pregnancy is maintained by the hormone balance of this world’s Maika. If it shifts back to the original world’s Maika… We don’t know what could happen. No, it’s almost certain that it would negatively affect both her and the baby. Our baby might not even make it…”

“…!”

Saying it aloud made my chest tighten. I didn’t want to speak these words. I hated making Riko listen to such painful things while her face contorted in agony. But I couldn’t avoid saying it. I couldn’t turn away from this possibility.

“Riko, you must have realized this from the beginning. That’s why you didn’t want us doing anything that could result in a child. You knew we couldn’t risk getting Maika pregnant until we went to Koshien and made our way back to the original world.”

“…”

Riko had her head completely lowered now.

“Since we didn’t know exactly when this world would end, the boundary was unclear. To be extra cautious, you extended the no-mochi-mochi period until after Koshien ended, to avoid any chance of Maika getting pregnant before we returned.”

“…”

Maika took over, speaking to Riko, who remained stunned.

“Just to be clear, even waiting until the baby is born and then dying is not an option. Sure, that would mean no direct harm to the child’s health, but that would leave Kugo and me returning to the original world, and only the old versions of Hinonogi Riko and Yamada Kugo as the child’s parents. And I’ve been lying all along, but the old Hinonogi Riko and Yamada Kugo were basically friends-with-benefits.”

“…Huh…?”

Riko finally lifted her face, surprise showing for the first time. In other words, up until now, there hadn’t been anything surprising to her. As I suspected, Riko had understood everything from the beginning—about the risks of returning while pregnant.

“I’m sorry, Riko. That lie was entirely my decision. The original Yamada Kugo was a scumbag who treated women like objects. Hinonogi Maika would lose all memories of being pregnant or giving birth. I doubt she’d be able to properly raise a child. After all, this isn’t just a spiritual reincarnation—our entire bodies have been swapped. My and Maika’s child would biologically be unrelated to the original Yamada Kugo or Hinonogi Riko. A DNA test would reveal the truth; it wouldn’t be considered their child at all.”

This revelation came to me only after devising this plan.

Thinking back, the idea that siblings could reincarnate into a world and lose their blood ties might never have been possible from the start. I guess I had been clinging to an overly optimistic assumption… Well, both Maika and I are prone to becoming totally blind when it comes to issues involving my bride or our baby…

By that same logic, the chances are high that I’m still biologically related to my old man… Quite disappointing. I’ll keep that information to myself.

“So, Riko, for the sake of this child’s health and happiness, you must stay here, forever—”

“Wait!”

A loud voice interrupted me just as I was about to bow my head. Riko, now with a desperate look, cried out,

“I still… I still can’t believe it! Talking about some ridiculous ‘golden seductive age’ to deceive me! This whole pregnancy thing is a lie!”

“It’s not a lie, Riko. Kugo’s baby is in my belly. We’re just entering the golden Rikuto and Rumina age. Soon, we’ll have golden Haruto time or golden Emiri time.”

Maika had already decided on the names of our second and third children. And… I have to say, those are great names!

But Riko wasn’t swayed by such words. She trembled, her body shaking mochimochi.

“T-then show me proof! If you’re really pregnant, prove it to me!”

Of course, she’d demand that… I would’ve liked to just push through this, but…

Well, alright. I’ll trust Maika with the rest.

“…Fine. If that’s what you want, I’ll show you. It’ll be a pain if you accuse me of fabricating evidence later. This way.”

“Huh…? What are you… Wait, Maika-chan…!?”

Maika took Riko’s hand and pulled her out of the room. Unable to resist Maika’s determination, Riko stumbled after her.

And a few minutes later…

“See?”

“…”

“You watched with your own eyes, Riko, and confirmed it was my pee, right?”

“…”

“And it showed a positive result, didn’t it?”

Riko had returned, utterly dazed.

Beside her, Maika held up a plastic stick like a thermometer and showed me its display. She looked so proud. And still smelled as good as ever. This is the golden seductive age.

Yep. It’s exactly what it looks like.

“So, it’s true… that Maika-chan has big brother’s baby in her belly…”

“That’s right. It’s true. You’re happy about it too, aren’t you?”

Which means—she’s not pregnant at all.

Of course, she isn’t. Maika and I have never actually done anything like that. I’m still a golden virgin and Maika’s still her seductive, pure self.

The stick showing a positive result wasn’t a pregnancy test but an ovulation predictor. It’s a type of over-the-counter medicine used to identify fertile days, and it looks a lot like a pregnancy test. Honestly, I didn’t even know such things existed, and without Maika’s explanation, I might have been fooled by that positive result myself.

And so was Riko. She couldn’t even understand the meaning behind extra-thick condoms, so there was no way she could tell the difference between a pregnancy test and an ovulation test.

I had been worried about what to do if she demanded proof, but thankfully, Maika had been diligently tracking her fertile days every month, just in case. I’m not sure what she was preparing for, though.

Anyway. The point is, Maika and I put on an act to deceive Riko into believing that Maika is pregnant.

And now, it’s all gone according to plan.

Riko had completely slumped to the floor, utterly convinced.

With a weak voice, she muttered,

“It’s true… I did notice Maika-chan’s belly seemed to be growing lately… So that’s what was happening…”

“…Yep, that’s what it is… even though it’s only been five weeks.”

Well done, Maika! You held yourself together! The old you would’ve snapped for sure! You’ve grown so much… Becoming a mother has made you mature…

Of course, this lie will eventually be exposed.

So, before that happens, we need to make it real for Riko—before it’s too late. Preferably this month… I mean, today or tomorrow, I’ll have to—

No, this isn’t the time to be thinking about that.