Beta Testing
By Limewah
Commission/Patron Reward for Izzybun
18+
CW: Incest

Kris.

I almost missed the email. Well, to be honest, I sent it to the Spam Dimension when I first saw it.

Welcome to Alter8, Kris!

As I right clicked on it and marked it as Spam, I was racking my brains. I’d seen that word somewhere before, on some random site or another…One of the social media apps I spent way too much time on? Probably. I decided to have a quick search through my emails, and my browser history, and that’s how I came across the sleek, oil-slick black website again.
Shiiiit, right…
I’d seen Alter8 on one of those crowdfunding websites. It was supposed to be some sort of reality-altering remote control.The description was full of buzzwords I didn’t quite understand, and terms that sounded like they came out of some medical textbook from the 1800s. Still, it looked like a fun little gadget to fool around with.
There was a video attached. A pretty cute vixen was showing off its features on one of her co-developers; changing the cat’s height, making their hair grow out and change colour, even editing their voice to make it deeper and more masculine. It all raced by pretty fast, and I couldn’t really tell how much was edited.
“By the way,” she said as the demo was coming to a close. “I’m not actually a vixen. Not normally, anyway.”
She pointed the remote at herself and clicked the button. The svelte vixen became a pudgy wolf - he was still cute, but it was such a 180 in appearance I ended up laughing out loud. Whether this was genuine or not, it was a fun watch.
Little bit hot, too, if I’m being honest. I might have re-watched the video a couple of times. And rubbed myself. My tail curled around my leg, and I caught myself purring after the fourth re-play.

It was already well funded by the time I saw it. They’d got six figures of backing money already, and they had a few days left before it closed.
It was probably bunk, as cool as it looked. There was no way a little piece of aluminium full of computer chips and shit could change your body and mind completely. 
That’s what I told myself, since my next payday was going to come after the final deadline, and I didn’t want my horniness to put another expense on my credit card.
However, they did have an email sign-up for a closed beta that anyone could enter. The chances were one in a million, but I figured, hey, fuck it, everyone else on the internet has my email address at this point, what’s one more unvetted tech company?

Well, they got back to me. Almost a full year later, long enough for me to have to remind myself. But hey, neat.
I opened the email and skimmed it, looking for the important details. I’d entered my mailing address within minutes, and sent it off. It was going to be 5 or so business days. Plenty of time for me to consider what I was gonna do with it, and overhype myself. So I tried my hardest to just put it all out of my mind.
Honestly, it wasn’t that difficult. I found some new distractions and things to be horny about not too long after. A little bit of dabbling with music production and binaurals sustained me for a while, fucking around with a few friends to the point where they’d cum their brains out when they heard just the right little burst of sound. Then a night out at a club and a chance encounter with a rabbit with fur as dark as night sent me into a hole as black as that fur. I barely remembered that week, and was still in the middle of a come-down from that euphoria when this ‘gift’ from past Kris came to lift my spirits again. Thanks, past Kris. Love ya, babe.
It was still a prototype, as the tiny box said, but they still put in the effort to make the unboxing experience, well… an experience. The cardboard flaps slipped out almost perfectly silently, and I lifted the box open like there was an engagement ring inside. There, in its cradle, wrapped in soft fibre-plastic, was a little bud about the size of a walnut, covered in sleek, shiny black aluminium. Along with it was a little card with a QR code that said ‘Scan Me for the App’, along with a really thickly folded little piece of paper that said ‘Caution, please read’.

I ignored that paper. Who had time to read?
I almost dropped my phone with excitement as I trained my camera on the QR code. Soon, my screen had turned black as the Alter8 logo appeared before me; a curved figure 8 turned diagonally, with the letters of the name slithering along the peaks and troughs.
The next screen told me that it was ‘searching for device’. I had the thought that maybe the thing needed to be charged, but then I heard a soft pinging sensation emanating from the phone - and in my head. The last place I expected to hear it. Or feel it.
 It made me ‘mrrp’ and my tail stand on end. Looking back at the screen, I could see a readout of someone’s heart and brainwaves, and with two small buttons to press below it that said ‘Name’ and ‘Connect’. 
…Shit, was that me?
There were more details appearing. ‘Feline’. ‘Yellow fur’. ‘Brown hair, medium length, wavy’. ‘Young Adult’. ‘Green eyes’. 
Just from that pinging sound, that tiny bud had managed to read everything about me. Or was it my phone using the bead?

I hesitantly brought my finger towards it, practically hearing my heart thumping in my ears. I could see it getting stronger and stronger in real time on the screen. 80 bpm. 100bpm. 110 bpm.. The little nub buzzed and vibrated on the table. The air vibrated with it, like the little walnut thingy was connecting to my brain directly. Like my thoughts were getting microwaved. Something was about to happen.

Was I gonna do this? Was I gonna start messing around with my mind and body? And was it going to work, or was my head gonna explode or something? Or was it going to just be a disappointing piece of crap?
I took a deep breath, bit my lip, and just as my finger moved to touch the button, I heard footsteps and a voice.

“Hey, Kris, did you feel that-”
Just as I realised my brother had walked in the room, I saw that my profile had moved to make room for his. Too late. I’d hit ‘connect’. Alex choked on whatever he was going to say next. 
“What….re you … doing…?” Alex slurred and groaned. 
“Oops… s-sorry,” I said, glancing back at the screen on my phone and the transmitter in my hand. “Guess this thing has some range, huh…”
“Hnn?” I wasn’t sure if Alex was conscious or not. But my male spitting-image was staggering drunkenly and his eyes were drooping along with his heavy head.
…Hot.
“I feel… hnnhn.” Alex groaned.
“Don’t worry about it, lemme just fix that…” The screen had changed to an exhaustingly long menu of sliders and buttons and dials. “How do I disconnect you…”
“Disconnect me from what?” 
He seemed to be lucid again, getting over that initial shock, and his eyes were locked on to my phone. 
“Uh… nothing?” I said, smiling at him as sweetly as I could manage with my wide boggling eyes. I couldn’t have looked more suspicious. 
He scoffed and shrugged. 
I glanced down at the screen, seeing a whole array of different sliders and controls for different parts of his body. My eyes shot to one option in particular.

Genital size.

I pressed my finger against it, and stroked the slider to the right.
His confused grunt was immediately followed by the sound of his shitty underwear ripping apart as his cock bulged against his normally baggy lounge pants. 
“What the fuuuhuuuck…?”
“Holy shit!” I laughed. “Do you feel that?”
“Y-yeah… yeah I do!” Alex sputtered, pulling the waistband out to stare a little bleary-eyed. at his giant junk. “How did you do that?”
I showed him the screen. “Check it out. It’s like a real life character creator.”
“...that only gives me more questions.”
“Hold still. Lemme see what else we can do.”
“I don’t get a choice, do I…”

While staring at him, I scrolled back up to the very top, to the height slider again. I cautiously pushed it up about half an inch or so.
…the instantaneousness was almost frightening. Alex was growing in real time. I pushed it back down, going down about half a foot, and his body shrunk - it lagged a little behind, probably keeping the transition short to make sure it didn’t give his muscles and bones whiplash. He seemed to be enjoying himself, honestly. He didn’t sound too uncomfortable. He was making the sort of noises he’d probably make at a chiropractor. Though, judging by the way his eyes were getting heavy and his head was drooping, he was probably getting a bit too turned on. He was probably gonna pass out if he got too hard.

I returned my attention to the dick slider. 
“Lemme bring you back to normal,” I said, stroking the slider back in the opposite direction - going too far “accidentally” on purpose.
…I couldn’t help myself. I had to see if it worked.
The bulge vanished from his pj bottoms, and his face dropped into a fuckin’ hilarious look of horror.
“H-hey! Too far, too far!” he grasped at himself frantically.
“Sorry~” I sing-songed. “Alright, that’s enough fun for now… lemme just disconnect you.”
I found a button that had a little symbol that looked like a plug being stuck into a socket. Or pulled out. It said ‘Disable’. So I assumed it meant that would disable the thing. 

“Okay, let me know when it’ssuuuhhhhh…”
When I looked back up at Alex again, he was looking way woozier than before. His head was blank, tilted to one side, and his eyes were wide, his pupils dilating and shrinking rapidly before slowing down in pace. Nope, that one just seemed to just turn Alex off entirely. It disabled his mind. 
“Sorry…” I said, though… honestly, I was feeling less and less sorry by the second.
I continued down the list. The first one I could see was ‘height’, already set to his usual five feet and seven inches. Same as me.

When I got closer to the bottom, I saw a button with a microphone symbol next to it. ‘Command (Beta)’.
I felt like a teenager who’d stolen their dad’s car. Nervous, but also… really excited to see where I could take this.
I pressed on the button and held it down. I wasn’t sure whether I should just speak out loud or speak directly into my phone, so I went for the second option.
“Can you hear me, Alex?” I said.
“Yes,” he responded, his voice flat and blank.
Fffucking hell I was dripping wet.
“Take off your clothes,” I said, a little more forcefully than I intended.

“Yes.” Alex droned, stripping himself down to his skivvies. There was no sign of his usual bulge, and when he slid down his boxers… yep. His dick was tiny. Exactly as I’d set it. 
I giggled like an idiot, I’m ashamed to say…
Okay, enough fucking around. It was time to wake him up. Finally, I found the disconnect button down at the very bottom of the controls, after a solid 5 seconds of rapid scrolling. 
Geez, I remember thinking, this thing’s got a lot of options.
I touched the button, and Alex snorted like he’d just been woken up from a nap, shaking his head and rubbing his eyes with the heel of his palm.

“Hooh…” Alex groaned. “That was a head-rush.” 
“You… you felt all that?” I asked.
Alex reached down to scratch his inner thigh, fondling at his now-miniaturised prick. 
“Yep… g-gimme a second, okay? I need to catch my breath…”
“What was it like?”

Alex.
“Hey, Kris, did you feel that tingly thing?” 
That’s what I was going to say. But then I got what felt like an electric shock, like a bolt of invisible lightning had just shot into my head from the table near Kris.
The force hit me between the eyes and shot through every atom of my body. I’ve never been shocked, and I’m sure it hurts like hell. This was not like that. Bracing, maybe, like that time I got given an electroshock ‘exercise’ belt that didn’t even do shit, but not painful. My head was swimming, feeling like it was made out of jell-o that hadn’t quite set yet.
Even when I had managed to grab onto my thoughts and pull them back, keeping them from floating away… I still felt a bit like jelly.
Especially when my dick got bigger. All the blood in my body just drained into my dick, and it was squishing against my pjs and leg . It was a tight squeeze. Tight enough to turn me on. I could feel my brain getting starved of blood by the second as my third leg pulsed and throbbed, trying to rip itself free. It was hard to concentrate on what Kris was saying, or what she was doing to me. It all just felt… really good. I felt sleepy, ready to just conk the fuck out entirely. 

It was probably a good thing Kris saved me from that by shrinking me back down to size. And then some.
As pissed off as I was, getting my dick shrunk felt way nicer than I thought it would. Like all the pleasure centres and nerves were being compacted together and concentrated in one tiny, super sensitive nub. I was thinking about playing with it, for about a second before she hit that other button.

I got a jolt that made my insides turn to pure pleasure, and my whole body went stiff. My mind just sort of… paused.
I was aware, but in that sort of distant, out-of-body sense, like I was looking at myself in a character creator in a video game. I could feel myself breathing and could feel all the changes she made to me, but I was also watching myself, if that made sense? I felt all the sensations, even more strongly. I wasn’t in control of any of them anymore.

When she spoke, I heard her voice inside my head. Like an ASMR video. And her voice was (and don’t take this the wrong way, me saying this about my sister) incredibly hot. The way her voice purred and whispered in my head… obeying her felt easy and natural, even though I was saying ‘Yes’ involuntarily, and stripping myself stiffly and awkwardly like I was playing out a pre-canned animation.

Yeah… it felt a bit weirdly video-gamey. That’s how I’d describe it.

When she woke me up, my dick felt crazy sensitive. Like I’d been edging for a few hours straight. I didn’t want to make a big deal out of it, though my hand went right to my thigh, already eager to touch it. 
Not the first time I’d touched myself in front of my sister, though. It wasn’t the biggest deal. We fucked around now and again, but never anything more than voyeurism and jerking each other off. And… well, this was putting me in the mood for exactly that.
“What was it like?” 
I was about to respond when she started messing with the app and I got lost in the body-modding sauce again.

Kris.

Honestly I didn’t need to find out his reaction. He was too easy to read. First off, I dragged that dick slider all the way over to the other extreme. Alex’s voice went girly for a moment as he tried to stop his thick meat from slapping against the floor, so hard that it made the floor jostle.
“S-stooop…” Alex groaned, doubling over and trying to scoop his throbbing cock up. 
“Better throw your clothes back on, and fast~!” I cackled. “What if the neighbours see?”
“Th-they’re all at work, and you know it!” 
Alex was bright red. My teasing had scared the shit out of him, and I could have gotten off just to that expression. I feathered the slider back and forth, letting his dick shrink to something resembling his original size, before pushing it back up to max… then down into a micro-penis again. I sat down and enjoyed the show; he was trying to follow me, probably to snatch the phone from my hand. But the constant growth and shrinking was overwhelming him, and he was drizzling pre. Up, and down, and up, and down, and hovering in the middle. I was playing his dick slider like a theremin, and he was making some noises that matched. He kept trying to say something, probably ask me to stop or something like that. All that came out of him were breathy mewls and wheezes and gasps. The sort of noises he usually made during sex.

Hey, if he really wanted me to stop, he’d have tried harder. 
“Alright, alright, get your clothes on,” I said. “Don’t wanna embarrass you.”
“Y-yes you do!” Alex whined, frantically snatching his clothes off the floor and throwing himself into them. 
“But you were having so much fun!” I said, drawing my attention to the Command button again. I overshot and noticed the top of another button a little lower down. I scrolled down to see what it was. ‘Personality EQ’. 
“Ooooh…” I looked up at him with a grin. “I got something we can try.”
“Oh god, just… g-gimme a sec,” Alex half said, half giggled.
“I can see you smiiiile~!” I sing-songed, before scrolling back to the dick slider for one last push to the extreme. As it grew, his meat made the leg of his pants bulge until I could catch the tip of it just shyly peeking out at the leg-hole.
As he whined and groaned, I headed straight to the EQ.
The first two sliders on that menu seemed normal enough.
High Energy to Low Energy.
Introverted to Extroverted.
Brainy to Ditzy.

But then it got very obviously hornier.
Dominant to Submissive. 
Bratty to Sweet.
Nympho to Chaste.

There were other ones, but I knew which ones I wanted to mess with first.
“Let me know how this feels!” 
He was a bit of a brat at the best of times, and I wanted to see just how far I could push it. As bratty as he could get, and as introverted as he could get. I always thought he’d make a good tsundere~.
His legs buckled inwards and he bit on his lip, scowling as hard as he could to try and hide his pleasure.
“S-stop that!” he hissed, making a swiping grab for my phone. I pulled it out of reach. Not a chance. “You’re g-genuinely the biggest bitch in the goddamn world!”

I cackled at his choice of words.
“I think you’re protesting a bit too much~” I said. “Just let yourself loose a little bit more.”
When I pushed the Sex-frequency to Nympho, his eyes went crossed as he fought the urge to drool and bit on his lip even harder. 
“Nnnghhn….”
“You wanna show yourself off, or what?” I asked. “C’mon.”
“Wh-wha…?” 
I slid the EQ slider that worked on his thought processes to the slower side of things. His eyes got all deep and glassy and vacant, almost like a cow’s. 
“Weren’t you gonna show off your fat dick for me?”
“Nnnuhnn, maybe…?” he asked, nodding his head slowly. He giggled like a ditz.
I had to take advantage of that.

“Yeah… show me what you’ve got,” I cooed. “And take your time taking it all off for me, this time. I want you to put on a show for me.”
As he gyrated and hooked his thumbs into the hems of his pjs, I crossed one leg over the other and sat back. From his rhythms, I could tell he was probably dancing to some song in his head. He had a big, dopey smile on his face. Oblivious to the changes I was making to him. I gave him a thicker ass, first off, making it a little harder for him to shimmy out of his pjs and show off that long dick. 
I  tucked in his tummy and thinned out his waist, giving him a sort of hourglass figure. The slimming of his torso was making his shirt droop and sag. He pulled the baggy shirt off over his head, giggling all the while like a bimbo.
Then, the coup de grace. 
“Wow… that’s gotta be the biggest dick I’ve ever seen~!” 

As I was saying that, I’d already moved back to that particular slider. And it was a micropenis once again.
“Hmph.” Alex said, completely oblivious. “Finally some recognition. You’re finally admitting that I’ve got a great cock!”
“Mhmm…” I nodded. “I bet I’ve seen bigger though, now that I’m looking at it.”
“What?!” Alex looked offended, and I almost felt bad, even though I knew it was just due to him being a bit addled. “You sure about that?”
He pulled off his boxers and grabbed underneath his balls, holding up his package and almost shaking it in my direction. “See? Look!”
His fully erect cock was about half the size of each of his balls. I snorted.
“S-stop laughing!” he puffed out his cheeks and stomped on the floor. Wow, he was really leaning into the airhead tsundere look.
Man, I was dripping. 
I ‘disabled’ him again, sending him back to blank. Then I gave him a little bit of coaching.
“You know your dick’s tiny. And that’s a good thing. It’s not unusual. You’re proud of how small your cock is. The smaller, the better.”
“Yes.”
“Perfect~!”
I ‘re-enabled’ him and let him get back to showing himself off.
“Wow, that dick’s tiny,” I said again.
“Damn right~!” Alex grinned, wiggling his hips and wagging his long kitty-tail. “No one’s got a dick as small as mine. You’re lucky to get to witness it, sis~”
He rubbed his thumb on the tip, around and around. It was probably rock hard already, but it wasn’t growing an inch. 
“Is it turning you on too?” he purred.
“Mmmaaaybe~?” I replied, coyly. His confidence and obliviousness was what was really getting me off. But he could tell I was getting wet. So he kept playing with himself, fondling his nuts and his little dick for me. He stepped towards me, making sure I could get a nice, up close look.
“Mmnh. Can’t believe my sister’s down bad for my dick.” he growled. “I don’t blame you, honestly.”
Gosh, his confidence was adorable. But my mind was moving elsewhere. I wasn’t about to let him take control of this little game. And I knew exactly what he could do next to keep this moving nicely along.

“You know something?” I sat back a bit, raising my eyebrows. “I think that dick would look great if it was tenting my lingerie. Why don’t you raid my closet and bring some options?”
As I said that, I pushed ‘Nympho’ as far as it could go.
“Ooooh, awesome idea~!” he practically bounced on his heels, clapping his hands together. “Thanks, sis~!”

Off he flounced, his hands out to the sides as he practically skipped towards the door, singing some little song to himself. Gosh, being a bimbo really became him. 
“Thanks, my li’l stripperslut~!”
“Stripperslut?”
That stopped him in his tracks. “Huh?”
“Oh, come on.” I smiled, seeing how far I could push this. “You’re acting like you haven’t always been my personal stripper? Like you don’t enjoy stripping for me all the time?”
“Uhm…” he looked as though he was trying to make sense of it in his head, his eyes sort of going back and forth as he searched his empty head.
“You are. Trust me, you are.”
“Mmm… okay!” Alex grinned. He seemed really glad that he didn’t have to think about it anymore as he went back to flouncing away.
I was a little envious, honestly. Maybe I’d have to let him have control later…

Much later.

Soon, he was back in the room, his hands full of bras, panties, and garters. All my lacy, gothy ones, as well as my meshy ‘sports bra’ that might as well have been a basketball net.
His nipples were rock hard. It had to be that one.
I gestured to it with a ‘go on’ expression, and he nodded, dropping all the other clothes on the floor. I thought about calling him out for that, but I didn’t want to interrupt his flow. He was having a good time, the poor dumb boy~
Thanks to my modifications to his body, it fit him perfectly snug, hugging his chest and making him unconsciously push his chest forward.
“That’s it~” I said with a grin. “That’s what I like to see. Find the stockings that go with ‘em. But don’t rip them!”
“I won’t!” he stuck out his lower lip at me, a little bit defiant, and rummaged through the lingerie to find them next.
“Take your time putting them on.”
“Fiiine.” He sat down on the floor, spreading his legs wide. I could see the gears turning slowly in his head, as he looked towards me and a glint slowly passed through his eye. Taking one of the stockings, he lifted his leg and splayed the toes out before very, very slowly working it in. It hugged his ankle as he slowly rolled it up his thighs.
He giggled, this cute little lilting arpeggio. The cutest noise I’d ever heard him make in my entire life. He was going to turn me feral. My pussy was on fire. I was this close to sitting on his face and insisting that he bury his tongue inside me. But… I had to hold it off. There was more to come.
My shaky paws stroked my phone screen to find some more things to play with.
There was a toggle. Penis to Vulva. How could I not?
“How’s your dick feeling?” I asked. “Tiny? Throbby? Does it need to get played with?”
“Yeah…” he said. “Maybe once I’m dressed up, we can see about that.”
He didn’t even notice it. The transition was so quick. His balls had just sort of slipped inside him, and his cock had turned into a little tiny clit. I wasn’t super close, but it sure looked a lot like what I was packing between my legs.
“Once you get the other stocking on, you’ll have to deal with that, won’t you? Rub your clit?”
“My clit?” Alex giggle-scoffed. “You mean my microdick?”
“Sure, your microdick, if that’s what you wanna call it. But where’re your balls?”
“Mmn.” he shrugged, tugging the first stocking up the rest of the way. “I’unno.”
He went right to work on the next one, still taking his time and working his crowd of one. It was good shit.
I noticed a little tick box as I lazily scrolled along. Normalise. What did that do? I tapped it, and it pulsed as the box was filled in. 
“Angh~!” 
I looked at Alex. He was buckling over a little bit, eyes going crossed.
“What’s up?”
“J-just the usual,” he said. “Just masturbating in front of my sister. Like I usually do.”

He squatted down low, spreading his legs wide, still rubbing at himself. He was quiet for a little bit, except for the little gasps he was making as his middle finger pushed a little lower.
“I’m curious,” I said. “Doesn’t anything about this seem weird to you?”
“In what way?” He huffed, slipping his middle finger inside his new hole. “Hhnh…”
“I don’t know, I thought you had a dick before. But it looks to me like you’re packing something else down there now…”

“Pssh.” He scoffed. “Boys have pussies. I’ve always had one! C’mon sis, you know that.”
I was starting to get a sense of the game. Or the effect of the app. I wanted to push it a little more.
“I’m pretty sure you’re supposed to have a dick and balls. Where’d they go?”
“What’re you talking about?!” Alex laughed. “Don’t be ridiculous. I don’t have those! Boys have pussies!”

If it was perfectly natural for him to have a cunny, then… what was he expecting between my legs?
“Hey, look at me!” Alex said as I scrolled through the functions. “Don’t stare at that thing!”
“Gimme juuuuust a second,” I said, whistling through my teeth while I figured out how to have this app work its magic on me.
I noticed a little tab at the top of the menu, and when I pressed it I felt a pinch on the back of my neck as it ‘calibrated’.
“Kriiiis!”
“Just a moment!” I almost snapped, spasming a little bit from that tingly pinch. Scrolling down through the same settings as before, I found the same toggle for genitals as before. This time, I sent it to the other side. (Not before making sure the ‘normalise’ box was unticked for me. Didn’t want to end up in the same reality-altering pit as my brother, after all.)
I was expecting it would feel like I was being turned inside out for a second. But I didn’t feel a thing, aside from a strange little rush of blood. Little bit like when I got aroused, or when I started to move my foot after it fell asleep. The sparkler-tingles made me squirm a little, as my jeans started to bulge. They weren’t built for containing a dick. I had to wriggle out of them quick. My dick slipped out through the leg-hole of my panties, hugging against my thigh, warm and firm. 

I gasped out a “whoa”, simply staring at my new third leg. It was thick as hell. 
“What’s the deal?” Alex was pushing another finger in, still in that perfect squat. “You’re acting like you’ve never seen your own dick before.”

It was true… but he was accepting the changes as though they’d always been there.
Would that happen to me, too, if I ticked that box?
I was too horny to really think about it for much more than that. I had to start masturbating. I set my phone down to work the shaft and balls at the same time. A lot dryer than when I was fingering myself, and the flesh wasn’t quite as sensitive. But the action of rubbing, going up and down… it was hot as hell. I understood it now.
“Is this what it’s like?” I asked Alex. “Am I doing this right?”
Alex had gotten another finger inside, spreading his hole wide. “Wh-what ya asking me for? I’ve never had one of those.”
“R-right yeah…!” I gasped, feeling an unfamiliar throb on the soft underbelly of my meat. “And I’ve a-always had this, silly me…”
“Right,” Alex said. “Now stop fooling around and jerk off!”

“Bossy today, aren’t you…” I smiled, leaning forward and focusing all my attention on my brother’s gyrating hips and warm, wet slit. He was exploring himself a little awkwardly too, but was doing it with perfect confidence. For a little while, we just admired each other, purring and rubbing and dribbling pre. 
“Don’t cum,” I helpfully reminded him. “We should take our time with this, we’ve got a whole day don’t we?”
“Yeah…” he’d fallen out of his squat and onto the floor, his legs outstretched as he rubbed and clawed at himself. His other hand was up at his chest, fondling at some boobs that weren’t even there.
I hadn’t even thought of giving him tits. Later on, maybe…

Alex

She was acting so weird. She wasn’t usually this excited or weirdly exploratory when she was jerking off. It was like she was playing with it for the first time or something. Ridiculous. She’d had it her whole life.

I knew I’d be better at using that thing. 
Maybe I had some envy? My sister had an amazing dick. I’m not gonna pretend she didn’t. Watching her rub her pole and buck her hips… she was getting more confident, and started to jack it the way I would if I was lucky enough to have one.

Whatever. She didn’t have a g-spot like me. So I had that one up on her. Once I found it, it made my insides squeeze inwards, gripping my fingers tighter and forcing me to keep going. 
I had to sit down just because my legs were so shaky, staring up at her and watching her work. 
After a while, though, I could see it. She was starting to get a little bit bored. Or restless, anyway. It made sense. We did this sort of thing all the time. It was what siblings did, after all - jacking off was the best way to show affection. It’s what all brothers and sisters did, I was 100 percent sure of that.
She wanted to try something new. She was a bit of a novelty junkie like that.
When she picked up her phone again, I wondered what ‘torture’ she had planned for me next. It was gonna be great.

Was she gonna give me a dick like hers? Or breasts? Or make me cum on the spot? Or something else… it was hard to know!
I couldn’t wait though. It’d make my job as her personal stripper so much easier.
She got a weird look on her face, a weird grin. I felt a pinch on the back of my neck again, like I was being lifted up off the floor. 
As she tapped and rubbed at the screen, my tongue started to feel thick in my mouth.

Kris

“Ahn…?” he stopped rubbing, looking so confused. His mouth was being forced open slowly, as his tongue got longer, rounder, and thicker. A perfect carbon copy of what used to be between his legs was now poking out from between his lips, at three-quarter mast and growing rapidly. 
Fuck me, this thing was magic. It had to be.
I couldn’t take my eyes off the tip of his ‘tongue’. It was tempting me closer like some kind of hypnotic snake. Daring me closer.  My mouth felt empty. I knew where I wanted that beautiful thing to go. Still stroking myself, I knelt down on the floor and crawled towards him. I had to get a taste of him. 
“Kuh… Krith…?” he slurred through a mouthful of cock. His brain was probably dumping the usual dose of happy-chemicals through his body. When I wrapped my lips around the tip of his cock, it kept throbbing and growing, and his moans were still muffled by the thick cocktongue. 
We’d fucked around plenty before. But this felt especially transgressive, and strange. No one would get our dynamic. Not that we cared.
All we cared about - or, well, all I cared about - was making out with my brother, and sucking on that dick tongue of his. My hand slid down to pull his other hand free of his slit, before I got to work. He mewled and took the hint, his own slick fingers wrapping around my dick as we writhed and pushed against each other.
We kissed, and kissed, and I licked and squeezed his cockhead while my lips pressed to his. It was glistening with my saliva, and his too. Smooth and slick and juicy.
I found myself wanting one too… It was too hard to pass up. 
But trying to pull myself away from that dick-tongue was just as hard. Like I was leashed to Alex, unable to move, forced to kiss. Not that there was anything forced about it. We both loved it. I dragged my tongue along the underside, wrapped it back around, then… an idea for a little experiment popped into my head, and I had to see it through.

I pushed the top of his head and lead him downwards onto his knees, his body brushing against my fat meat. My dick was shivering and rock-hard, so close in its own right… no wonder boys got so horny all the time, with a thing like this to deal with. He looked up at me, his eyes dewy and shiny with need, his dick-tongue lolling out. I swayed my cock from side to side, and he followed it like it was a laser pointer on the wall, his pupils dilating.
“Suck,” I said. “Don’t you wanna suck?”
“Uh-huh…” he moaned, leaky cocktongue twitching as he turned its tip towards my cocktip. He closed his eyes and opened his mouth wide, the way he usually did… he was impatient, he always liked to deepthroat as quick as possible.
It was a bit tricky for him at first, he kept squishing his dicktip against mine…
“Keep trying, Alex, you’ll get it eventually~” I ran my fingers through his hair, watching as he kept bapping the tip, Like he was trying to connect two magnets of the same polarity, expecting them to stick together. The touch wasn’t getting me off, obviously… but he was trying so hard with that leaky thing, and it was so fucking adorable to watch.
He managed to figure it out, somehow, and when he did… hooh. I was suddenly engulfed. His cocktongue couldn’t exactly lick against my new dick, but it could lap and throb and pulse, like a really wet frotting session. I’d watched him do this kind of thing many times before… blowjobs and frotting, not at the same time of course. I’d wondered what it felt like for the other dick-haver in that situation. They looked like they were constantly on the verge of cumming.
Fuck, this was what I’d been missing, huh? He was a wizard with his mouth, even with that dick in the way.
I was jealous of every single person he ever sucked off.

As I stared down at him, bobbing up and down, his throbbing tongue beating against my dick… something occurred to me.
I was jealous of him too. I was jealous of his dick-tongue. I wanted my own.
I pushed him away, leaving him gasping for air, and immediately started fumbling with my phone, still feeling the ping of that little magic seed on the table nearby. Switching over to my profile, and seeking out that same function…
It was extremely hard to talk with that mouthful of dick. Basically impossible, in fact. But… god damn did it feel good. Even better when I scooped him back up to standing, we touched dick-tips together and wrapped our arms around each other.
It was hard to push our tongues past each other, we couldn’t french-kiss the way we normally did. But that wasn’t going to stop us from trying. I grabbed the back of his head and rubbed my cock-tongue-tip along the side of his. I managed to guide his dick to the corner of my mouth and push it in. I probably looked ridiculous, my cheek bulging like a chipmunk’s as his cock nestled itself snugly inside. My lips got to work as best I could, and I could feel his dicktongue throbbing as if to say ‘thank you’. 
It felt pretty amazing from my end, too, my head fizzing like it was full of popping candy. My toes and fingers wanted to curl in on each other, and my lower dick was leaking like crazy.
…I was missing something though. Maybe a few of his personality tweaks could come back.
It was a bit hard to see it out of the corner of my eye, but eventually I managed to find his sliders.
The bratty effect was instantaneous. He pulled back and grinned, keeping his head - and his dick tongue - just out of reach. He had a ‘come n’ get it’ look on his face, and when i tried to ‘kiss’ him again, he pulled away. I whined. He giggled, and yanked the phone out of my grasp before I could switch him back.
Shit, that was dangerous… what if we both got caught in a rut?
“N-nuh nuh…!” I tried to protest - pretty hard to do with a mouthful of dick. He pulled away from me and started to peck at the screen - before I could even get a step towards him I-

Nnnhn fuck….~

Alex.

I only half-looked at it. It looked like Kris had been messing with my mind and body for a little bit. Or at least tried to… obviously, I’d always been a bit of a horndog, and I’d always had a pussy, and I’d always had a cock for a tongue. Did this app even work?
I turned away from Kris, dodging her hands and ducking away from her, as I found my way to her profile.
She was groaning and grunting at me. She couldn’t exactly speak anyway…
“What’s that?” I asked, having no problem speaking with my dick-tongue - why would I? She looked at me all confused, though. “Want me to make you into a bimbo?” 
“Huh…?” Still playing dumb. I was gonna take it as a yes.
“Sounds good to me~!”
I found the setting that seemed closest to that, and started to stroke the slider.
She moaned so loudly the neighbours would be able to hear. When I turned to stare at her, she was giggling like a little girl, her tongue drooling, cock throbbing, her body swaying.
“Lih… huhhh… ahuhunh.” she just kept babbling away.
“Use your words!” I said, trying to shush her a little.
“Wuh? Heeehee…” she was laughing at me. I looked at myself to confirm there was nothing off. Why was she laughing?
“What’s so funny?” I asked.
She seemed to be ignoring me, eyes going crossed as she stared at her big thick cocktongue. Her fingers wrapped around it and began to stroke. She moaned, her other hand going down to her other dick.
“Awww, you like showing off, huh? Guess this thing does work… That’s neat… lessee what else we can play with here…”
“Nhahah… lah, whah?” she said, not taking her hand off her cock.
“Shhshshsh. Lemme see here…”
So mental changes did work. Did that mean the physical ones would…?
I immediately went for trying out the ‘chest’ function. I pushed it to one side, and as I watched, her breasts ballooned in size, the soft fatty puffs squishing against her arms. Next I gave her some hips to match. Being a big dicked bimbo really suited her, seeing how her boobs were pressed together by her rubbing arms, and how she kept making the cutest, dumbest groans.

Physical stuff worked too. This was great! I kept scrolling. She was whining at me some more, like a pet begging for food.
“Gimme a second,” I said. “Hold your horses.”
Nympho, huh…?
Her ‘Chaste to Nympho’ slider was skewed way too far to the left - it was right of centre, when it really needed to be all the way over to the Nympho side. So that’s what I did.
And the moan she made… god, it was beautiful. I knew I was in for a wild ride.
I looked up at her, into her eyes.. They were dilated, fixated on me. Then her eyes travelled down between my legs. Her tongue-dick was throbbing like crazy as it pointed at my pussylips. 
…uh oh. That’s what she had in mind, huh…?
“Heh… looks like you see something you like~” I said, swaying my hips and spreading my lips just a little. See if I could play hard to get some more, play keepaway.

Didn’t really work out that way. She was too fast. She tackled me like a hungry beast - I didn’t even realise it was happening until I banged my head off the floor. She pulled my legs apart and dove right in before I could recover. 
It took my mind off the throbbing pain in my head, that was for sure… 
She buried her tongue inside me, her lips suckling on my clit, her warmth radiating through me.
I might have came embarrassingly quickly. How could I not? It felt fucking incredible. Like what I imagined getting fucked by a tentacle might feel like. Warm, wet, thick, powerful, and dextrous… My toes were curling into claws, and I caught my hands digging into the floor as she bobbed and pushed, squishing her nose against my clit and making her tongue throb…
“Th…that’s good, Kris,” I said. “You’re doing such a good job. K-keep it up, you’re gonna make me cum again…~!

–

Kris.

I had no idea what my bro was saying, but he was saying it so confidently. Maybe he didn’t realise his dicktongue was keeping him from speaking. It was, like, really hot that he was trying so hard. 
It was nice that he wasn’t distracted by that dumb little candybar thingy in his hand. Now I could force him to pay attention to me.
Wait, what was that candybar thingy again? Wasn’t that my phone?
Silly me, I thought, forgetting things like that… I’m such a bimbo, aren’t I? Being empty headed really comes naturally to me, like… wow.
I mean… I know I’m not, like, normally, like, like this, but it was kinda nice to have a bit of a mental break.
Especially since it meant I could focus on really properly tongue-fucking my brother. My throat was beginning to feel really tight for some reason. Something was building inside it. The sensations were pretty familiar… an orgasm was starting to build up in my mouth. It was like I was having a really tasty milkshake and letting a blob of it sit inside my mouth. It was melting in my mouth. So lush.
I pushed harder. Alex’s clit was gonna make me sneeze, it was tickling my nose so much. It was really fun to twang it and wiggle it though… especially because he was moaning and mewling so much. I pushed in deeper, getting really used to that flavour, and… 
It was kinda like I was squirting water out of my mouth. And cumming at the same time. I pumped him pretty full, if I do say so myself. It was, like, so cute to hear him groaning through his cocktongue. And even cuter when he came himself, even though it kinda hurt my tongue a little bit when he squeezed so tight…
I really loved feeling him gush against me. 
I kinda wanted to see how long I could keep myself inside him, if I could make him cum a few more times…
I heard a little buzz and chime from that weird little bead a little distance away. I’d forgotten that was the source of all our fun… and it was probably gonna run out of juice in a bit.
Like… should I have charged it first? 
Oh well. I shimmied back and let my dick slide out of Alex’s cunny. He collapsed back on the floor like he was gonna melt into a puddle. I was a little out of it too… this whole thing’d been a head rush. 
I managed to find my phone, and, sure enough, I could see a little thingy flashing at the top. You know, the thingy that tells you something you gotta know. Like if the battery’s about to, like, die or something.
Before I could do anything with it, another thing flashed up. I tried to poke at it to get it to go away, but it was telling me 
‘Reverting : please wait.”
Like… reverting? What was that supposed to…
Oh, right. Going back to normal.
Speaking of which, I could feel my braincells coming back to life, my thoughts getting faster again… 
And my tongue was turning back to normal. Man, it was hard to breathe with that thing…

“Hahh…” I laid back, watching as my dick shrank and morphed back into my old bits. Alex looked to be going through the same thing, his hips rolling in the air as his cock emerged once more. Not tiny, not enormous… just his usual size.
“What… the fuck was that…?” he asked, sounding a bit like he was re-learning how to talk.
“Do you not remember any of it?” I asked.
“No, I do, but… holy shit…” he looked at me, pupils dilated, a little bit of feral drool at the corner of his mouth. “We gotta… do that again.”
“Once that li’l guy’s recharged, absolutely,” I said. I tried to get up to my feet, but my legs gave out from under me, and I collapsed headfirst into Alex’s stomach.
“Hoofh!”
“S-sorry… took a lot outta me.”
“It’s okay…” he reached down to rub my head, and what was I supposed to do, not purr?
“We can just… chill out here for a while.”
I reached up to rub his head, and get him purring too. He had no objections to that. 
Man, he was warm… warmer than usual. Maybe that was another effect of the thing…
We could charge that thing up later… it wasn’t going anywhere. And his body was way too comfy. I could conk out for a little while. 
And dream of what I was going to do next.

–

“Still don’t have it working?” 
I looked up from my phone. Alex was lurking just at the doorframe, halfway out the door. 
“Yeah, uh, no,” I said, still playing with the little humming bead in my hand. I stroked along the screen, peering at the settings, looking frustrated. “It’s still not connecting… and they’re not responding to my emails.”
“Maybe they’re swamped with complaints?” Alex shrugged.
“Maybe… hey, we’re beta testers. So it’s whatever. If this ends up being a paperweight…”
“Ah. Anyway. I’m heading to the bodega. Want anything?”
“Uh… no, no, I think I’m good.” I waved him off. 
“Alright, see you!”
“Wait, hang on.” I leapt off the couch. There was something I needed to do. 
He came back into view just in time for me to kiss him. 
He moaned into the kiss, not too surprised… but that oral fixation of his was giving him a stiffy. I could feel it, because it was stiffening against my tongue. I let my hands slide down his hips, one going into his pants to rub at his clit. 
“Wh…whehh…” Alex moaned, already finding it hard to speak with his fat cock-tongue. 
“Just wanna give ya a little pick-me-up,” I growled, rubbing my boner against his stomach. 
“O-okay, sis…”

I didn’t feel bad about lying to him. It was part of the fun. Alter8 was working like a charm. Keeping it charged meant that Alex was my plaything basically all the time… once he left the bubble of its influence, he’d be ‘back to normal’. But he wouldn’t ever notice the change when he came back in range. Business as usual for him… and hours of fun for me. 
Was I gonna tell him eventually? Maybe, maybe… but not any time soon. We’d been at this for about a month by now… so far, no problems.
It’s not like I was addicted to it.

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