Smuggled Home
"I could've hidden you under my clothes a minute ago, but you've gotten so big already... Should've held back a little, hehe."
Her voice had gone a touch husky and languid from all that moaning, and the way she scratched her head with that sheepish little smile nearly set me off again. Still, figuring out how to get us safely to a magical girl's house came first.
The original game's setting was clear enough: monsters crawled out of dimensional cracks. Those cracks tended to cluster in certain regions, so humanity had built a massive barrier around the densest zones to contain the spread. Magical girls and heroes would periodically sweep the inside clean. That was the basic lore.
And yet, every other day, some rare crack would open near a city instead of inside the sealed cluster, monsters would pour out and trash the place, and the heroine magical girl would end up with her crotch on full display. Standard plot.
It was less an erotic game with a story and more a story-shaped erotic game. The worldbuilding was so thin that by the late game you wanted to start yelling "why, though?" at the screen—but expecting coherence from a porn game was probably the real mistake.
Judging by the way this magical girl was muttering to herself, we were still inside the barrier. True to its third-rate roots, the original had even parodied those popular checkpoint games of the era. If the heroine's lewdness got too high or her reputation hit rock bottom, the checkpoint guards would "body-search" her as a harassment mini-game. I remembered that clearly.
You could also smuggle ingredients for aphrodisiacs and other illicit drugs past the gate, and fencing those paid decently—until you sold too many times and got snatched by underworld thugs, ending up as a drug-addled slut. That ending existed too.
Which was why physical inspections were mandatory. Given the circumstances, this magical girl trying to walk a monster out of the barrier was in roughly the same boat.
The real bastard part was that you had to go inside the barrier for in-game resources. If you tried a virginity run, your growth was naturally more constrained than a normal playthrough, your reputation tanked, and then some asshole guard would casually snatch the virginity you'd been protecting the whole time. Just thinking about those bastards soured my mood.
So I sulked, nestled in the magical girl's arms, savoring the soft give of her breasts while putting the IQ boost those same breasts had granted me to full use. Time to think of a plan.
"Hehe. After tormenting me like that, now you're acting all cute?"
A tentacle monster still slick with her own fluids should have been a little gross, but this tentacle-fetishist magical girl didn't push me away. She stroked me with pure affection instead. Heeung. Mama.
Was this what pillow talk between lovers felt like? My heart went all warm and fuzzy.
I was still enjoying her touch when she lifted me up and started examining me from every angle.
Thanks to that ultra-concentrated magical-girl breast milk, I'd started out pigeon-sized—small enough to fit in one of her hands. Now she needed both hands just to hold me up.
About the size of a cat at this point?
"Wow~ You've gotten so big! Hehe. Just as I hoped—feeding you my mana right after you hatched means you don't have that dark mana monsters usually carry. It really worked!! If I can just hide you well enough, we shouldn't get caught."
Right. That was a thing.
Dark mana—the distinctive, malevolent energy signature monsters and demons carried. The game never bothered explaining the fine differences from regular mana. Just like I'd drawn mana from a magical girl's fluids, monster fluids carried dark mana, and if a human "willingly absorbed" it into their body, they underwent corruption.
In practice, that lore showed up exactly once: a scene where the already-slutty magical girl heroine got even sluttier in her corrupted form, taking a creampie while her costume got even more revealing, all while moaning something like "my pussy feels so goood~." That was the entire explanation.
Basically just "dark mana = bad, okay~" with zero detail, and then everyone went "ooooh, corruption form is hot as hell" and moved on. That was my memory of it.
I couldn't communicate with this magical girl, but somehow I had a strong feeling that later on she'd lean into a corruption cosplay for sex. A woman with a tentacle fetish who was raising her own tentacle from scratch? No way she wouldn't.
"Haa~ I should've hidden you when you were still small..."
She kept trying to tuck me under her clothes from different angles, testing the fit, then realized there was simply no way to conceal something my size. She started chewing her nails, looking anxious.
And then it hit me—courtesy of all that thorough exploration of her bare skin earlier.
I'd forgotten the classic method. Shame on this tentacle...!
—Wriggle wriggle.
"Hyat?! Th-that tickles~ Come on... I was trying to take you with me!! You can't get any bigger!!"
As I burrowed into her body, she tried to stop me, thinking I wanted round two—but a glance at her face showed her grinning goofily, not really blocking me at all.
I almost felt bad for betraying her expectations.
"O-ooooh…?"
I thinned myself out and wrapped around her. She looked down, fascinated. Within a few dozen seconds, I'd settled so naturally under her clothes that you wouldn't notice me unless you lifted them.
Ehehe… I can feel her skin, her scent, everything.
"Wow, you're really smart. Wait… did you actually understand what I said and hide on purpose?"
—Wriggle wriggle.
"Kyah?!"
I gave her nipple a light pinch for "yes," and she jumped. Then she muttered in disbelief.
"Huh...? D-did you really understand me? I mean... a normal tentacle would've instinctively gone for my womb even without me stripping... Did you know it was dangerous and stay out on purpose?"
—Wriggle.
"Waaaaah... That's amazing! Amaziiing!!"
She kept murmuring in wonder.
Wait. That was actually instinct?
So it wasn't just me being a massive pervert who wanted to crawl into her womb?
"Haa~ I got careless. If you hadn't been this smart, you might've slipped in before I could stop you and necrotized from the mana overload."
Wait. I almost turned into tentacle juice for real?
From now on, I decided, I would trust my instincts as little as possible.
"Heehee. To get such a clever little one on the very first try... I'm so lucky!"
That's my line, lady. I'm the one who got reincarnated here.
In high spirits, the magical girl set off with a spring in her step.
Except her speed was no joke—like she'd hopped into a car.
Sh-she's strong...
I'd guessed as much from the mana I could sense, but seeing her physical ability firsthand, she was far stronger than I'd expected. Surprising.
I'd never seen anyone who looked like her in the original game, either.
—THUD.
Even at that blistering pace, whenever something showed up whose mana made me wonder if I could win even with a hundred of me—no, a thousand—she casually threw a punch and the monsters burst like overripe tomatoes. My knees went weak just watching.
"Mm~ We're at the checkpoint now, so stay quiet, okay?"
Before you could even cook a pack of ramen, she'd sliced through—no, exploded—dozens of monsters. As the checkpoint came into view, she paused, took a steadying breath to settle her nerves, and walked in.
"Yeah. His mana wavelength is almost identical to mine, and under the clothes... I've worked this hard for exactly this, so they won't go as far as a full body search... Yeah!"
So you worked all this time just to smuggle a tentacle in.
I let out a sigh that was half admiration, half despair at her sheer obsession. As we entered the checkpoint, a soldier stood guard at the entrance.
A private...? Fresh meat. Heh heh heh... I finished my full term of service a long time ago...! Not that a tentacle has anywhere left to go...
"Ah! Salute! Lady Topaz, thank you for your hard work on the outer patrol again today."
"Yaho~ Soldier guy. All clear out there today~ I took down a few monsters, but nothing that looked like a special specimen!"
So the magical girl's name was Topaz.
She probably had a real name too, but I had no way of learning it right now. I set the disappointment aside. Time for the long-awaited inspection.
"You must be exhausted—please head on through. Just a quick scan and we'll send you right along."
"Okay~ Thanks~"
I was relieved they weren't doing the body search I'd feared most.
Even knowing I'd absorbed Topaz's mana and carried no dark mana of my own, the moment the scanner swept over her body, I could feel her heart hammering like it wanted to burst out of her chest.
ALL CLEAR.
At the scanner's flat, mechanical voice, Topaz finally exhaled a secret sigh of relief.
"Haha, glad to hear it. A few years back we had that whole mess with a parasite-specialized monster getting through~ And the way you handled it back then, Lady Topaz…! You were incredible!"
—Flinch.
—Read the room.
"Ahaha~ So you're a fan? Thanks! Should I give you an autograph~?"
"Wha—!! I didn't bring it up for that reason, but… would it be all right to ask?!"
She signed the delighted soldier's helmet, and at last we were free to leave the barrier.
"Whew~ We didn't get caught…!"
Topaz beamed, triumphant with relief—then quickly collected herself, glanced around, and picked up the pace.
Amazingly, just outside the barrier was the city. Not the downtown core, but close enough that you could see the urban nightscape not far off. Ten minutes by car, maybe.
Seeing a city that near, I finally understood why the story kept having monsters casually reverse-charge into town whenever they felt like it.
The original never described the distance between the barrier and the city, so people on the boards used to argue there must be some secret hidden in the city that a sequel would reveal. Turns out it was just "because it's close." What a letdown.
Then again, a sequel did come out, and I transmigrated into a tentacle, so... result: all right.
"Hwaah~!! We're really here~!"
I'd been keeping my movements to a minimum so I wouldn't burden Topaz, lost in thought, and before I knew it we'd arrived at what I assumed was her house. Faster than a magical-girl car, of course.
—Sliiiide.
So this is my nest from now on…!
In my human life I'd lived in a cramped one-room box in a concrete jungle that barely got any sun. Now I'd become the tentacle of my dreams, gotten within an inch of sex with my number-one favorite magical girl, would be doing the real deal before long, and would eventually plant my eggs in Topaz—just thinking about it sent a rush of excitement so intense I could've sworn my long-gone midsection was standing at attention. My whole body trembled.
—Shiver shiver.
"Ahaha, I'm glad you seem to like the house. I even dug through research papers to set the temperature and humidity to what tentacles prefer. Good thing I did!"
Now that she mentioned it, I realized the floor wasn't scorching the way it had been when I first hatched. No need for that automatic mucus secretion—I could glide around the house smoothly.
Infinite care and love I'd never received even as a human! I expressed my joy with a little dance.
—Wriggle♪ Wriggle~ Squirm squirm♪
"Pfft! What is that~ Are you happy?"
Topaz laughed and gave me a gentle head-pat for my dance.
Sex was great and all, but just wriggling around and getting stroked like this... in some sense, wasn't this the ultimate form of TS? Something that transcended gender entirely.
I'd changed species itself—Trans Species—so I was right. Argue and I'll machine-gun you.
My brain was melting a little under Topaz's petting, spawning nonsense thoughts, when another big event arrived.
"Hnn~ Thanks to our little tentacle, I came a lot today, so I'm tired and sticky. I should wash up. Want to wash with me?"
—Nod nod nod nod nod.
"Ahaha! So desperate. But no naughty stuff until after we wash, okay?"
I followed Topaz to the bathroom. With only a little exaggeration, it was as big as the one-room apartment I'd lived in—a spacious bath with a shower stall and a tub wide enough for two adults.
The sheer difference in living standards, plus the fact that a woman like this was about to give a mere tentacle everything she had, filled me with a strange sense of conquest as I admired Topaz with a towel wrapped around her.
"Honestly, you really are something else. A tentacle who tells me to cover up."
She'd been naked, but I'd personally draped the towel around her. Nudity was nice, but the aesthetics of concealment were not to be missed. And once it got wet, the way it clung to her curves and turned faintly translucent was enough to drive a man insane.

Ehehe…
I watched her wash from below, savoring her plump thighs and the soft folds of her sex, while stretching a tendril upward to appreciate the real-life valley of her breasts—so overwhelming that water pooled there during the shower and then cascaded down all at once.
—Scrub scrub.
Since my own body was basically going to be used as a dick, I scrubbed myself clean with the soapy water running off Topaz so I wouldn't pass anything on to her. Mmm. Magical-girl bathwater.
After the shower, we climbed into the big tub and soaked in the warm water. I couldn't even remember the last time I'd been to a bathhouse as a human. A thousand years' worth of bath, and I could feel my body melting loose.
Ooooh. They float.
I confirmed with my own eyes the anime fact that huge breasts float in water, and gradually felt the strength drain from my body.
At first I'd planned to go wild with her right there in the bathroom, but my consciousness was getting hazy. Instinctively, I wrapped my whole body around Topaz—a silent vow that I would never let go.
N-no... I can't fall aslee... zzz....
"Oh? You're not moving as much. Did you fall asleep…? Hehe. Well, you were born less than a day ago and it's been a lot. You must be exhausted. Should I sleep too?"
I'd thought I was holding on tight, but she gently peeled me free, dried us both off, and climbed into bed with me.
And I stopped fighting the wave of sleep, tumbling straight into unconsciousness.