Creating My Own Magic (3)
I knew it was a pretty insane idea, but when knowledge like that is stuck in your head, what are you supposed to do about it?
A place that has to be scrubbed completely clean before you can use it—and that doesn't take well to being wiped down with strong alkaline soap or anything of the sort. Naturally, with no substitute available, it was a place you'd have to clean with magic, no matter how much of a hassle it was.
"Yeah, spread it open for me a little more. Nice and clear."
"...Th-this position is kind of embarrassing."
It was her anus, of course.
In the real world, you'd scrub it thoroughly and still use a condom, or the hygiene situation would be a mess. But if this magic's effect worked properly on the rectum, it could temporarily turn the place into something that wasn't a waste-disposal organ at all—and then it would become a hole you could use just fine without a condom.
It was an idea that had come out of nowhere, and asking Nia to help me test it was every bit as crazy as it sounded. But once the curiosity had taken hold, there was no stopping.
Honestly, the reason I'd never put anal sex into my work before was that the hygiene angle made me worry it wouldn't catch on. With a precondition like this attached, though? That changed everything.
"Alright. I'm going to activate it."
"Hahk!?"
At the sudden sensation of liquid sliding into her anus, Nia let out a strange little sound, buried her face against the floor, and trembled. Fortunately it didn't seem to hurt—more like the magic was opening her just enough to clean, keeping the stretch to a minimum. Same as when I'd washed my hands earlier: the fluid that scrubbed the body simply vanished when it was done, leaving everything remarkably tidy.
"S-sorry. I'm going to spread you open and check."
I braced myself for the possibility of something unpleasant and looked inside—only to find it far cleaner than the brief glimpse I'd gotten before. Cleaner than clean. The surface under my fingers was so thoroughly scrubbed it almost felt like I was touching some other part of her body entirely.
"Works great.... It doesn't hurt or anything?"
"No. If anything, it feels a little refreshing."
A few more tests after that confirmed it: everything that could reasonably be called the rectum was being washed perfectly clean. Which meant the stretch that would take a cock was coming out spotless. As an enema substitute for anal sex, the magic was flawless.
"Honestly, I wonder if the person who made this spell was researching anal sex."
"...W-what is that even supposed to mean?"
"Putting a cock in the place we just cleaned...?"
The concept of anal sex existed in this world too, of course. Humans will stick it in any hole they can find—it would be stranger if the idea didn't exist. Nia simply didn't know about it because she was a wholesome, well-behaved kid who'd only ever looked at clean material.
"Y-you mean actually having sex with the anus!?"
"People do it with mouths and tits. Why would an ass-hole be any different?"
"B-but it's dirty."
"Which is exactly why, looking at a magic that can make it clean, I'm wondering if that was the intended use."
That said, the spell did feel a little more optimized for hands. Probably just a side effect of how thoroughly it cleaned—and it happened to make this possible. Still, wasn't this actually pretty great?
"A-and something as big as Cali's cock could never fit in there."
"When you push out something thick every once in a while, doesn't that suggest the possibility?"
"I wouldn't know about that!"
Ah. Right. Nia and I had this weird blend of same-sex and opposite-sex friend dynamics going, so I tended to say things without filtering—and that was definitely not something you say to a girl. I apologized properly and sincerely.
"Of course, even after cleaning, whatever's higher up can still come down, so the risk is still there."
"Th-then...?"
"Well, there's probably a module that solves that too, right?"
"S-so in the end you're saying you're going to do it!?"
Obviously.
I kneaded her cute little ass freely while telling her I wouldn't do anything if she didn't want it. That said, I'd already told her I wouldn't use her pussy because of the pregnancy risk—and once I explained that a well-trained anus could deliver a sensation close to actual sex, she started thinking it over.
"S-so you're saying we could have sex almost normally? And without getting pregnant...?"
"Not completely normal—there are differences. But it's not like tits or a mouth, where you have to satisfy each other separately."
"H-hmm...."
I'd need to dig deeper into the magic side, but I was pretty sure I'd seen a module in that book earlier that could suspend bowel activity for a while. Layer that on top and nothing would come down into a cleaned rectum—making it, for all practical purposes, a perfect prep combo for anal sex. I'd have to think through the magic-circle design and figure out the right configuration.
If possible, I should center a new work around anal, attach the magic circle, and let people use it that way.
It was a little disappointing that a person still had to cast the magic themselves—but until I got good enough to write modular magic on my own, there wasn't much I could do about that. Once I introduced the concept, someone might well come out with a product that solved it. The screentone pens had started from the screentone concept I'd introduced, after all.
The final form of the magic and the work itself could wait for more thought. What mattered right now was persuading Nia, who was still deep in earnest deliberation. There were plenty of times I wanted to grab her and pound her senseless—but if I slipped into the front hole and got her pregnant, that would be a disaster.
"Anal isn't something you just dive into anyway. You need preliminary work, the same way you'd develop a pussy. Think of it as a little taste-test while we do that. How about it?"
"D-develop it like a pussy? What does that mean?"
"It wasn't made for that originally. Shove something in cold and it'll just hurt. Same way your chest hurts if someone starts groping hard from the jump."
"Ahh...?"
Apparently she'd been imagining me just ramming my cock in from the start. Once that mental image was cleared away, genuine interest flickered across her face. I waited until she finally nodded—and then I started touching her already-slick pussy.
"W-wait! Why there.... Hnn♡"
"Two reasons. First: an anus doesn't produce love juices, so you have to supply them somehow—and nothing works better for that than a pussy."
I gathered the wetness dripping from between her legs in my palm and spread it carefully over her anus. Still a little short, but with more of it, a finger would go in fine. I pushed into her pussy and sped up the curling motion of my fingers; Nia clung to me, sinking into the pleasure.
"Hahk♡ Hnngh...!"
"And second: erogenous zones can link. Stimulate both at once and the body stops being able to tell the pleasures apart—they start to blend."
In other words, training her body to feel her anus the way it felt her pussy. I took a properly soaked finger and pushed it into her freshly cleaned anus. The moment the foreign object entered, I felt her clench hard, trying to push it back out.
"Hyeek!? Th-that's weird...!"
"No time to dwell on it."
I found the spots in her anus that made her most sensitive and worked them with my finger, while my other hand kept thrusting into her pussy. The point was to make it hard to tell which side was being tormented into feeling good—and start linking the two pleasures together.
"Hnngh♡ Ngh♡ Hn♡ Weird♡ It's weird♡ Hnnnnngh...!"
Splurt!
The instant she climaxed, love juices poured from her pussy and soaked her hair and her anus alike. Seizing the chance, I ramped up the pace on her now even better-lubricated rear.
"Hn♡ This should feel weird♡ This sensation...♡ Nngh♡ Weird♡ Feels good♡ This is weird though♡ Weeeird...♡ Nnh!?"
I was still stimulating her pussy too—hitting her most sensitive places accurately and pleasurably—but so gently and carefully that she could barely register it. So when the pleasure spiked, the only thing that had intensified was the anal side. Her body would start to believe the good feeling was coming from there.
"Hn♡ Hnn...!"
The human body is dumber than people think. Once it decides something feels good, it starts rewriting itself to feel that thing more easily. Rewriting a body isn't as simple as it sounds—but when the place you're rewriting is already famous as an erogenous zone waiting to be developed?
"There. Your anus is becoming a pussy. No need to call it an anus anymore. How about back-pussy? A pussy that sits in the back!"
"Hngk!? Hnnngh♡ Hn♡ Hyaaaah!?"
Nia's whole body shuddered; her hips lifted off the floor—and then she froze as if locked in place, climaxing with an extraordinary expression on her face. Still arched, she trembled in fine spasms, dropping short, thick moans like her breath kept catching. Only then did I take my hands off her.
"Hyaaah♡ Hnngh...♡"
Her strength gave out and she flopped onto her back. As a side effect of going completely limp, she even wet herself a little while riding out the afterglow. As if it still remembered the stimulation, her greedy little back-pussy fluttered open and shut, calling for something to make it feel good again.
"Hahh.... My head's all fuzzy...."
"Feel good?"
"Yeah, it did. S-so... that means we can do this with sex too, not just hands... right?"
"You're interested after all?"
"M-maybe...."
Perfect. Satisfied that she'd come around completely, I nodded and stroked her hair—forgetting, for a second, that the fingers doing the stroking were the ones still sticky with her juices. Sorry, Nia. Your hair is now a matted, love-juice-soaked mess.
"It's fine. I'll just wash it...."
"Ah, right. If we're going to use your anus, I should go borrow that."
"That?"
There was something in our club room that was exactly what this situation called for. I'd have to ask the original owner, Rosaria, and borrow it for a bit.