Two days after the Christmas party.

I was inside a pure white laboratory, located in a corner of the Grigori research facility.

『3… 2… 1… That’s enough.』

At the signal from Azazel-sensei over the speaker, I stopped releasing my power.

The armor, which had been glowing red, ceased its radiance, and the violent aura gradually calmed down. Once the aura had completely subsided, I dismissed the armor entirely.

After exhaling deeply, I exited the laboratory.

Waiting for me was Azazel-sensei, dressed in a white coat and looking every bit the researcher.

“Good work. The measurements are done.”

Saying that, Sensei handed a towel to me as I dripped with sweat.

I took the towel and wiped the sweat running down my cheeks.

Then, Sensei pulled out something resembling a tablet panel, looked at the graph displayed on it, and spoke with an exasperated tone.

“Good grief, what are these nonsense numbers? What did you do to get readings like this? You already had more than enough power, but tripling those specs? There’s a limit to being reckless, you know.”

The reason I visited the Grigori experimental facility today.

It was to address the issue with Trans-Am—the combination of the EXA Mode and the Promotion 『Queen』 that I debuted in the recent battle—and to figure out a solution.

In the battle against Asem, I managed to gain enough power and speed to corner him, if only for an instant. However, by multiplying an inherently unstable power with an unadjusted one, I ended up causing the Sacred Gear to malfunction.

It worked out before the fight with Rizevim because Ddraig performed a super-high-speed adjustment on the Gear… but if something like that happens again, it’ll be bad in a lot of ways.

According to Ddraig, the adjustments for the 『Queen』 Promotion are finished, but combining it with EXA Mode is still something I should avoid. Apparently, even Ddraig can’t do anything about EXA Mode on his own.

That’s why I decided to seek help from the leading expert in Sacred Gear research, Azazel-sensei.

Sensei operated the panel, bringing up several graphs on the screen. One of them showed a red line graph spiking up and down violently.

Sensei pointed at it.

“This is the combination of EXA Mode and that Trans-Am thing. Your power jumps explosively, but look at how erratic the fluctuations are. At its lowest points—just for a split second—your output drops lower than it was before activating Trans-Am. As a result of reckless strengthening, your power isn’t stable.”

Sensei reached into his coat and pulled out a golden dagger.

It was the artificial Sacred Gear he used when he had a contract with Fafnir.

“The Balance Breaker of this thing is a pseudo-state created by overloading the Sacred Gear. Since it’s disposable, it’s naturally more unstable than a regular Sacred Gear. But what you’re doing is even worse than this. If you screw up, your Sacred Gear might genuinely become unusable.”

Ugh… Ddraig told me the same thing…

Having the Sacred Gear become unusable would be genuinely catastrophic. Especially considering the enemies we’ll face from now on.

“Well, maybe Asem is just that abnormal that you couldn’t win without going that far. Didn’t he surpass Ddraig and Albion in their prime?”

“…Yes.”

Asem… his power was abnormal.

He’s a goofy guy, but his strength is the real deal. To fight him, I really do have to push myself that far.

…Suddenly, I remembered something.

Asem… he…

With a bad feeling in my gut, I looked at Sensei’s face.

Sure enough, Sensei was wearing a lecherous expression…

“Still, I gotta say. You’ve gotten bold, haven’t you…? Sucking Rias and Alice’s tits in a place like that.”

“Whaaaaaaaat! Why are you saying that so wistfully!?”

“No, just admiring the growth of my student… Or in this case, is it degradation? As a human being.”

“I didn’t think things would turn out like that either! Our Useless Goddess and the perverts of generations past started saying incomprehensible things!”

“For someone saying that, you were going at it pretty intensely, weren’t you? Look.”

Sensei pressed a button on a remote control he pulled from somewhere.

And then—

『Nnn…! W-Wait, Issei! You’re sucking too much… Aahn!』

『I-Issei… Ah, don’t knead my butt so much… Fuaaaah!』

The footage Asem showed us is playinggggggg!

“Stoooooop! Even I’m embarrassed by that!”

“Oh my, you’re really sucking more than necessary here, aren’t you? You’re enjoying yourself a little bit, aren’t you?”

“Wait, don’t zooooooom in!”

Aah!

Rias and Alice’s faces filled the monitor! Both of them twitching with ecstatic expressions!

Erotic! They’re both so erotic!

But the memory in my brain is enough for this! Don’t put it on the monitor!

“Turn it off! If they find out about this, they’ll definitely kill me!”

“What, you haven’t told them about this recording yet?”

“Like I could!? Both of them would die of embarrassment! First off, Alice would punch me!”

“Well, you handle that part yourself, Harem King. Anyway, I’m keeping this recording. I’m going to use it for special effects later.”

“Haa!? What are you planning to do!?”

“I’m going to use the Twin Oppai System in the tokusatsu show. I’ll have Alice appear as Switch Hime, too. If I do that, the merchandise will sell like hotcakes!”

Why are your eyes sparkling so much!? Don’t use the Useless Goddess System!

“Breast Dragon is a show for kids, right!? If you use that, it’ll get an R-18 rating!”

“What are you saying now? We’re going all the way! Even in manga, there are series that push the limits, right? Like the one with the harem plan.”

“That’s pushing it way too far!”

This person seriously intends to push the limits!

Parents are going to complain! And I’m scared those complaints will be directed at me!

If that airs, won’t Rias and Alice die of shame!?

Azazel-sensei cleared his throat once.

“We can talk about commercialization later. For now, we have to do something about your recklessness. …But what to do?”

Sensei furrowed his brow and began to groan in thought.

After a brief silence, he rubbed his chin.

“As I said before, it’s impossible for a Sacred Gear to be unable to withstand its owner’s power. Sacred Gears exert power in response to the owner’s feelings, after all. Thinking simply, it means the Sacred Gear side can’t keep up with your feelings—with the speed of your evolution.”

“Is it the T.O.S. after all?”

“Most likely. The base three forms are stable, right? Then that has to be it. But… is it really a problem with the Sacred Gear? Ddraig said adjustments to the Gear wouldn’t fix it…”

Sensei started muttering to himself.

Twin Oppai System—a new theory of power constructed by Ignis. A truly ridiculous idea of synchronizing the New Power (Milk Power/Breast Power) of the two Switch Hime, Alice and Rias, to square the power instead of doubling it.

But the problem is, it actually produced results…

Terrifying results.

As Sensei and I were racking our brains, a silhouette appeared beside us.

“It means the potential of boobs is infinite! Also, I’m amazing for constructing a new theory!”

The strongest goddess materialized with high tension.

Yeah, I have to agree with that.

This goddess is seriously on another level.

—Why are you wearing a pilot suit!?

Ignis saluted the dumbfounded Sensei and me.

“I tried making one!”

“You made one!? Why!?”

“Well, I thought I’d try a new situation with the past Red Dragon Emperors.”

“What is a ‘new situation’!? Why a pilot suit!?”

“Because we can recreate launch scenes and stuff. —Ignis, taking off!”

“Oiiiii! The only thing taking off is your mind! Are you an idiot!? Hey, are you an idiot!?”

“By the way, I just made about five of them ascend (pass on)!”

“I didn’t ask! What do you mean ‘ascend’!? Did they die!? Did five of my predecessors die!?”

“Yes, they turned into… pure white ash.”

“They burned out completelyyyyyyyy!”

Stand up! Stand up, Senpai! Is it okay to burn out in a place like this!?

『Burning out is—totally fiiiiine!』

『Very gooood!』

Belzard-saaaaaaan!? Elsha-saaaaaaan!?

I don’t understand what you’re saying! What part is ‘very good’!?

Actually, you guys get along really well with the Useless Goddess, don’t you! It was the same with the T.O.S.!

『We are Ignis Cultists.』

『Those who uphold the teachings of Goddess Ignis.』

『『Eros is Power! Eros is Justice!』』

Th-They’ve been brainwasheeeeed! My decent predecessors have been brainwashed by the Useless Goddess!

This is the worst!

『Currently recruiting new believers!』

『Join now, and you can fondle Ignis-sama’s breasts all you want!』

“I’m joining!”

“You’re joining!?”

Sensei retorted at my instant reply.

Because Ignis’s goddess boobs are super soft! She’s a Useless Goddess, but her goddess boobs are the best!

“Well said! As expected of Issei!”

Ignis pressed her chest against my face!

She’s wearing a tight suit, so it feels almost direct! It’s the best!

Can I just bury my face in these boobs for a while?

『You guys, hurry up and find a solutionnnnnn!』

It was a tsukkomi of despair from Ddraig.

Having calmed down thanks to Ddraig’s retort, we resumed our discussion. We moved to the Japanese-style room in the back of the lab to confirm the current situation based on the analyzed data.

Apparently, having a Japanese-style room is Azazel-sensei’s hobby.

“I was thinking… isn’t the problem with that T.O.S. thing, rather than the Sacred Gear?”

Tiamat said, as if just realizing it.

As for why Tiamat is here:

“I’m free today.”

That’s apparently why.

She had absolutely nothing to do today and was bored out of her mind, so she came to my place.

Hmm, Tiamat is free-spirited too. Or maybe the dragon race itself is fundamentally free-spirited.

She’s so free that right now, she’s cleaning my ears. I’m getting a lap pillow from Tiamat while she cleans my ears.

“How is it? Feels good, right?”

“Yeah, Tiamat, you’re good at cleaning ears.”

“Is it surprising?”

“Surprising… yeah, maybe. Ah, but Tiamat gives off the vibe of being reliable and good at housework, so maybe not.”

We engaged in such heartwarming conversation. Anyway, what I want to say is that Onee-san’s lap pillow is the best.

Azazel-sensei sighed.

“Hey, hey, stop flirting, you two. This isn’t your house.”

“It’s fine, isn’t it? If you’re too nitpicky, you’ll never get a wife, unmarried otaku former Governor-General.”

“What did you say, dammit!”

“Alright, Issei. Next is the other side.”

“Ignored!”

As usual, Tiamat loves poking at Sensei’s bachelor status…

Anyway, getting back to the topic…

“I see. EXA Mode was originally a form born from the Milk Power of Alice-chan and Rias-chan. If the Milk Power stabilizes, the Sacred Gear might naturally adjust itself. Issei’s soul and the Sacred Gear are directly connected. And Issei’s soul and Milk Power are also directly connected. In that case, instead of the Sacred Gear, maybe it would be better to adjust… the Milk Power itself.”

Ignis proposed.

At a glance, you’d think, “She’s saying something stupid again…” but the scary part is that it actually sounds correct.

Azazel-sensei asked Ignis.

“Even so, how do we handle something like that?”

“Adjustment from the inside would be difficult. That would require Issei himself to change. Currently, internal adjustment is impossible. So, why not adjust it from the outside? Azazel-kun, you were able to create tools to control Sacred Gears, weren’t you?”

This time, Ignis asked Azazel-sensei.

True, in the process of researching Sacred Gears, Azazel-sensei had developed tools to control them. Providing those tools has helped people who are troubled by their inability to control their Sacred Gears.

But, I see.

If internal is a no-go, then external.

Ignis continued.

“Let’s make an auxiliary device. It should stabilize things a little. Of course, it doesn’t mean you’ll be able to use it for long periods or anything.”

“You mean it’s better than nothing?”

“Exactly.”

Ignis nodded at my question.

Then, I asked further.

“So, what’s the method?”

“Right, first we need to analyze the Milk Power of the two Switch Hime. So, Issei, could you go squeeze those two’s boobs for me?”

…

…

…

…Huh!?

“Haaaaaaaaaa!? H-Hey, you, what are you saying!?”

“Because those two’s boobs are the cornerstone of the T.O.S., right? Didn’t you reach that level by sucking their boobs? It’s only natural to analyze them again, right?”

“No, no, no, even so! Is there any other way!?”

“None.”

Instant reply!?

Squeeze their boobs… with what face am I supposed to ask that!? I can already see them freezing up the moment I ask!

Ignis placed both hands on my shoulders as I panicked.

Her expression was full of benevolence—.

“It’s okay. If it’s a request from Issei, those two will happily cooperate. —Take them to the 『Break Room』.”

“It comes back to that in the enddddddddd!”

Come to think of it, neither Azazel-sensei nor Tiamat are saying anything!

Have they given up!? Or are they convinced!?

Wait, is this decided!? I have to go squeeze Alice and Rias’s boobs!?

At this point, Sensei looked up.

“Ah, right, right, that just reminded me. Ignis, that thing is finished, right?”

Sensei took me to another laboratory.

Like the previous room, it was spacious and white, with equipment scattered everywhere.

The only difference was a large metal box in the center of the room.

A box… or maybe a room?

There was an entrance on one of the silver walls.

“Go in.”

Led by Sensei, I entered. Inside the box was a space about the size of a ten-tatami mat room. The ceiling was about three meters high.

Beside the door was something that looked like a device, equipped with a monitor and several buttons.

Sensei said, “This room was built by gathering the technological power of Heaven and the Underworld… in other words, the Three Factions, based on Ignis’s proposal.”

Built by gathering the technology of the Three Factions… If I only heard that part, I’d be moved that it was completed thanks to the peace treaty.

But the moment Ignis’s name came up, I had nothing but a bad feeling.

…Well, let’s at least hear the explanation.

Maybe it’s something serious.

Sensei pressed a button on the device.

Then—we, who were supposed to be inside the room, were standing outside!

We were in a place covered with white gravel.

“…A Japanese garden?”

Yes, I recognized this. It’s a place I actually saw on a school trip.

Did we teleport…?

But it didn’t feel like that. There were no tourists, either.

Sensei grinned.

“This thing allows you to recreate any and every location by operating that device.”

“Recreate a location?”

“Yeah. It applies the field technology of the Rating Game, so you can freely set the buildings and the size of the field.”

Sensei fiddled with the device again.

Suddenly, we were inside a church somewhere. Of course, there was no one else there.

Next was a meadow, then a mountain hut. And after that, a classroom at Kuoh Academy.

I touched a desk in the classroom, and it felt solid. When I opened the window, a breeze came in.

It really did recreate any and every location.

I see, I understand what this device is.

“But was this Ignis’s proposal? And couldn’t this be done with just Devil technology?”

“Not quite. This device incorporates the Devil side’s Rating Game field technology, spatial Sacred Gear technology, and the technology of Heaven’s doorknob.”

Hmm… Just now, there was definitely a strange technology mixed in at the end.

Heaven’s doorknob technology…?

Could it be… could it be—

Ignis flashed a V-sign and said:

“This is a room where Angels, Devils, Fallen Angels—none of that matters! It’s a room where you can make babies in any and every situation! Its name is the 『Love Room』!”

“I knew it! What the hell did you build!?”

“You see, I looked at that doorknob and thought: That limits the places where Irina-chan can do lewd things with Issei. Every time, it’s the same situation. She can’t do it in the infirmary like Miu-chan did. That lacks stimulation. So, I appealed directly to Michael-kun. —Let’s make a room where they can have sex in any and every situation!”

“Michael-saaaaaaaan!? Why did you agree to thaaaaaaat! And Sensei too! Why!?”

“Hey, hey, you left out Sirzechs. No, I guess the tech provider was Ajuka.”

“That person too!?”

“That just shows how much the Three Factions are expecting from you guys. The prosperity of the species depends on you. …Also, seeing Issei get drained dry is just too funny.”

That smile looks like a villain’s!

In the end, you’re enjoying this, aren’t you!? Is playing with me that fun!?

Ignis spread her arms wide.

“I’ll install this room in the back of the office warehouse. Now, Issei! Use it to your heart’s content! With this, you can recreate various places, from outdoors to classrooms! Onward to stimulating baby-making! This is a slightly late Christmas present for you all!”

…I couldn’t stop the Useless Goddess’s rampage.

Later, the 『Love Room』 really was installed in the office warehouse.

And I ended up being dragged into it by the women, including Irina, with rather high frequency.

——————————-

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