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The Impossible Program (closed for me and ThePrincess)

Joined
Oct 25, 2009
Location
Australia
Jessica stared at the program in-front of her, still not believing what it could do. She'd gotten it in an anonymous email last night that somehow slipped through GMail's spam filter. She gave it a thorough check with anti-virus software before opening it and when she did, she was presented with something that looked like a cross between the Spore Creature Creator and a 3D modelling program.

In the middle of the screen was a 3D model of a faceless, androgynous humanoid form. Jess found she could use the mouse to rotate it, zoom in, zoom out and basically look at it from whatever angle she wanted. There was a whole slew of toolbars on either side of the image but what caught her eye after the model was a drop-down box at the top of the screen.

Opening it, she found her full name - Jessica Maria Reilly - there, even though she hadn't entered it into the program. She clicked on it and the 3D model turned into an incredibly accurate render of herself, albeit naked.

Five-foot-four, long dark hair, amazing heterochromic eyes (the left one ice-blue and the right an emerald green) and a toned body from years of various martial arts. Of course, the muscle didn't detract from her womanly features - a pert backside you could bounce a coin off and shapely long legs that she loved to show off. To her annoyance, the program had also perfectly rendered her rather unimpressive B-cup breasts. Like a lot of girls, that was the main part of her body that she wasn't happy with.

She opened the help and spent the rest of the night running through some of the tutorials. Somehow, the program could alter a person's physical form, not just the 3D model of them, but the real person! The tutorials were reasonably straight-forward but even then she kept to the simple ones out of a sense of caution.

These were just altering proportions a bit, changing hair colour and length, age alteration, but there were far more options there that she hadn't used and was blown away by the sheer scale of what changes could be made (this was after she recovered from the shock of realising these were actual changes to her own body, mind).

At school that day, she'd asked a friend of hers to come over. They'd been friends since Jess came to the US from Australia back when she was 14 and had even gone out with her at one stage about a year ago (though they had been somewhat discreet about it, for obvious reasons). Despite the sex being fantastic, it just didn't feel right going out on a date or something and so they both called it off. Since then, they'd had a sort of friends-with-benefits relationship, although they dispense with the benefits if either of them is seeing someone. She hadn't told her about the program, figuring she wouldn't believe her if she didn't have some sort of demonstration.

Now she was just waiting for her to arrive.
 
Alison wasn't sure what all the fuss had been about. At school that day Jessica had seemed barely able to contain her excitement, going on and on about some awesome thing she had to show her, then remaining uncharacteristically tight lipped when pressed for any kind of details. The girl had been practically bouncing at school with all her excitement.....Alison hadn't seen the girl like that in a long long time....not since they had been dating actually.

Truth be told, Alison still sometimes regretted that things hadn't quite worked out between them. Despite her appearance, Alison didn't really get many dates. She was a complete nerd at heart, and that tended to scare the guys off in this town. Jessica though...she'd embraced exactly how Alison was. Somehow they had become fast friends, perhaps because they lived so close to one another and, being the new girl, Jessica was just as outcase as Alison was. But things had started to go further when the new girl had needed help with her computer. Alison had come over to help, things had happened and before either of them really knew it they were practically screaming the walls down.
Still, things had felt uncomfortable whenever they weren't having sex...and despite her minor regrets, Alison didn't want to say anything to pressure Jessica into something that would make her uncomfortable. And besides, their current relationship was certainly pleasing to the both of them.

"Alright, I'm here!" Alison let herself into Jessica's house as usual, calling up the stairs as she slipped off her shoes and jacket, then went to head upstairs towards Jessica's room, folding her arms when she walked inside. "So then, what is it that's gotten you so excited?"
 
No sooner had Alison stepped into the other girl's room when Jess came from right beside the doorway, wrapped her arms around her and pulled her into a heated kiss. One hand on the back of Alison's head, running through her hair, the other rubbing her back (while also checking if Alison was wearing a bra or not) before moving down and squeezing her butt.

As she finished and pulled back, she let Alison get a good look at the very short cream-and-red silk robe that Jess had put on after getting home from school. She didn't wear it too often, but when she did it was a sign that it was all she was wearing and that it wouldn't be staying for long. "Come over here, I'll show you," she said, taking Alison's hands and leading her over to the computer, sitting down at it and pulling the other girl into her lap. "I don't know how, but this program can change a person's body. Watch." To demonstrate, Jess pulled herself up on the program, opened a flyout menu on the side and moved a slider along a bit. The graphic of her was now two cup-sizes bigger and, after Jess hit the Apply button, her own tits followed suit until she was sporting a pair of pert D-cups that were almost pushing her robe open.
 
Alison was rather surprised when she was suddenly grabbed, and before she could even say anything else she was pulled into a kiss. It didn't take Alison long to get over her surprise though, beginning to return the kiss, pressing herself up against Jessica until the girl broke the kiss. She would find that Alison was indeed wearing a bra, much as usual, after all it was rare the girl got over her general shyness enough to leave her house without one. "A-ah.." Alison let out a slight whine when the kiss was broken, licking her lips without even realising it, before she found herself pulled over to the computer chair and sat in her friend's lap. "You're....excited this evening..." Alison couldn't help but giggle. She loved it when Jessica was in such a frisky mood, it reminded her of the old days and was a sure sign that they were in for a fun night.

"Hm? Change a persons body?" Alison glanced at the computer screen and raised an eyebrow, then looked back to Jessica sceptically. "Oh come on, you can't be serious. That's impossible. No computer program can....can...." Alison trailed off as Jessica adjusted the 3D model of herself on the program and hit apply, then suddenly felt something growing against her, pushing her away from the other girls chest. "Uhhh...." She blinked, slowly glancing down at Jessica's slowly inflating chest, until they finished growing. "That's....uh.....ooooh I get it. And inflatable bra right?" She chuckled softly, reaching out and poking Jessica's nose. "This is one of your kinky little games isn't it...?" She grinned softly. "Ok....I'll play along for now....why don't you show me what other little surprises you have hm?"
 
"Well I've got one little surprise in-mind," Jess said slyly before slipping her hands under Alison's shirt and up her back, unhooking her friend's bra before slowly pulling both off over her head. She leant in and started kissing at Alison's neck, holding her close with one hand. The other was busy with the mouse of her computer and Jess swivelled her chair so that she could see the screen while Alison couldn't. As she finished and hit apply, she leant back to watch her handiwork take shape. Namely Alison's breasts swelling up to a hefty F-cup.

"Still think I'm having you on about the program?" she said with a smirk, her own nipples rock-hard and poking through the thin silk of her robe.
 
"One little surp-ah!" Alison squeaked as her shirt and bra was suddenly slipped off over her head, her perky breasts bouncing slightly from the sudden motion, before those lips of Jessica's were all over her neck. "Ahhh..you're....frisky tonight....has it been so long...?" Alison was so engrossed with the other girl kissing at her neck she didn't notice what Jessica was doing, just shivering slightly when she noticed the attention was away from her. "Hmm....? Hey what're you doing Jes-" She cut off and blinked when she felt an....odd...sensation...sort of like a tingling in her chest, followed by an odd tightness. It wasn't uncomfortable but it was certainly....strange. "Hnn...?" She looked down at herself, blinking, then gasping with surprise.

Her breasts started to grow slowly, pushing out from her chest, the growth constant and steady, though no matter how big they got her breasts didn't sag, they stayed just as firm and perky as ever, until finally reaching a full F-cup, more than two or three times their original size. "Wh-what in the..? I....how is this....how did you...?" Alison looked up, looking between Jessica, the computer, then her newly enlarged breasts, before back to Jessica. "H-how in....this is....wh-whoa....I....you....that computer did....? I....but how? I...." She shook her head. "S-so...so what else can it do?"
 
Jess couldn't help licking her lips at the sight of Alison's breasts growing. From her playing around with the program the night before, Jess knew that the new size also came with a similar rise in sensitivity. What movement her robe was making over her own enlarged chest was getting distracting.

"Just about anything," she answered, leaning forward to gently nibble at Alison's ear while running a hand over and around one of Alison's breasts, gently squeezing the pert orb and pinching the nipple. "height, weight, age, proportions, even lets you add whole new parts - extra arms, another pair of these," she lifted Alison's breast up and gave the hard nipple a teasing lick. "Want to have a play around with it? Change yourself or me?"
 
Alison let out a sharp gasp when Jess reached over and stroked her fingers just around the edge of her newly enlarged breasts....that alone felt as good as having her nipples played with....though when the breast was suddenly squeezed and her nipple was pinched, she couldn't help but cry out in pleasure, it was as sensitive as her clit and felt just as good! "A-ah...oh god....oh god that felt....that felt amazing...." She was already panting heavily, looking down at the other girl. "H-huh....? Add....whole new....?" Alison blinked, then cried out again as her nipple was licked, before she somehow managed to pull herself away. "A-alright then..."

The normally shy, nerdy girl grinned slightly, then pushed Jess away slowly, wheeling her chair away from the computer. "You stay over there while I have a little play..." She grinned slightly, then turned around and leaned over the computer, large breasts hanging down. Oddly they didn't feel any heavier than before...it was as if her muscle strength had also been increased by the perfect amount to support her new assets. "Now where to begin..."

Alison took a few moments to familiarise herself with the program, being a computer nerd did have advantages in a situation like this. She'd often played with 3D modelling programs so it took only a few minutes for her to locate the basics, flicking the model back to one of Jess instead. "Hmm....oh yes....I think this definately.....ooooh....and what's this? Oh yes....most definately...." Alison made a few more clicks, then turned to face Jess with a smirk, hiding the screen behind her body as she reached back to click the mouse on the apply button. Behind her, the model of Jess was hidden, though the 3D model now showed an image of Jess with an extra set of breasts, the lower set a nice F-cup compared to the upper D-cups. But the biggest change was between Jess' legs. Alison had entered a setting for a nice 10 inch cock down there. What she hadn't realised was that 10 inches was the flaccid length and it would be created as such....but most certainly wouldn't stay that way....
 
Jess jokingly pouted as Alison directed her away from the computer. "Ooh, I was hoping to have a little fun while you worked." She walked over to the bed, undoing her robe and letting it fall to the floor before sitting down on the edge of the bed and crossing her legs as though it was perfectly normal for her to be stark naked. Jess was curious just what her friend was planning and the anticipation was killing her. Not to mention making a mark on the bedsheets under her.

Then she felt the tell-tale tingling she'd come to associate with a change from the program, but was surprised to feel it under her breasts. As she felt the tightening sensation, she realised what Alison had done and looked down to watch a new pair of breasts swell up under her normal ones. She was surprised that they were larger than her normal ones were but didn't complain - Alison had put them close enough to her normal ones that they rubbed against each other, giving a near-constant bit of light stimulation. Before she could give the new breasts a 'thorough inspection' she felt the same sensations coming from just above her clit. She uncrossed her legs, already guessing what Alison had done. Again, though, she was surprised by the size of the end result. It started as a small bump of flesh, slowly gaining shape as it lengthened until it finished at a full ten-inches long and with a nice girth. Once the change was complete, that's when the new cock started to 'come to life'.

"Didn't know you liked 'em that big, Alison." Jess joked, running her hands along her new breasts, not bothering to suppress the gasp from the sensitivity or the odd moan of pleasure. Her new cock was growing harder by the second and had already gained a few inches in length - Jess couldn't wait to see how big it would get. "Want to come over here and have a little fun with your handiwork?" she suggested, slowly stroking her new length with one hand while her other kept exploring her new breasts.
 
"Well I know how much you like to wait" Alison stuck her tongue out before she settled back to watch her handiwork, shivering as she watched. Ooh it was so incredible to watch those breasts growing on Jess' body, slowly inflating out and slightly lifting her original breasts, the look of pleasure on the girls face was such a turn on for Alison. Though even she was surprised when the next growth began to occur. Alison licked her lips at first as the cock began to grow out, though she was surprised to see that it was growing out flaccid, hanging down between Jess' legs...though certainly not for long. Almost the instant it had finished growing it started to twitch and move, then begin to grow longer...harder...thicker.

"O-oh god..." Alison stared in disbelief as the cock continued to grow, seemingly showing no signs of stopping. If anything the growth accelerated when Jess began to stroke it. "I....I hadn't meant to make it....th-that big...." She stared for a few more moments, before swallowing nervously. "I um.....ehehe....m-maybe it's too big....um....m-maybe we should....shrink it down a little...." Alison laughed nervously, looking up at Jess' face, starting to get the feeling that her friend was quite happy with her new cock just the way it was....
 
"I wouldn't worry about that," Jess said, standing up, still slowly stroking her half-hard cock - which was easily more than a foot long already - as she walked over to Alison. "There were some other settings in the program that I messed around with last night - one of them basically meant that anyone touching a cock that was modified by the program would be able to take it without any pain. Still gonna be tight as fuck though." Her cock jerked at the thought. "Doesn't work on the mouth, though, if you were planning on putting that amazing tongue of yours to work."

She let go of her cock and wrapped her arms around Alison again, this time pressing their enlarged breasts together and she couldn't resist moaning as the sensitive flesh met, her lower breasts large enough to rub against Alison's chest below her own heavy tits. "So, want to help me give the new equipment a test drive?"
 
"Uhhh...." Alison stared at Jess' cock as the girl walked, watching as it continued to grow longer and harder, bobbing up and down as the girl walked. It was impossible to look away from it, oh god it was huge....12...13...14...15....must've been at least 16 inches by now....and still....growing?! "Uhhh.....huh?" She somehow managed to tear her gaze away from the cock, looking up at Jess. "T-take it huh....? R-right..." She laughed nervously, then gasped as the girl got close, pressing their breasts together, or at least Jess' upper breasts anyway, the lower set pressing into Alison's chest, whilst Jess' cock had slipped between Alison's legs and was now sticking out the other side.

"O-ooooh!" Alison eagerly pressed herself further forward, rubbing her hard nipples against two of Jess' own. "Ahhh...f-fuck....oh god Jess....I need it....I need it so bad...I can't wait anymore..." Her pussy was already dripping with juices onto Jess' shaft between her legs. "P-please....oh god get it fully hard and show me what it can do! Please!"
 
Jess wasn't sure when Alison had gotten her panties off but at this point didn't really care. She kissed her fiercely, rubbing their breasts together harder as she ground her cock against Alison's dripping pussy lips, the thick shaft rapidly filling with blood. It only took a few seconds to finish growing, the end result being nearly 18 inches long and about three across, the bulbous head jutting out past Alison's butt as precum slowly oozed from the end. Jess' own pussy was just as wet as Alison's and she could feel her juices running down her thighs.

"Lie back on the bed, and quickly," Jess said, frantic lust clear in her voice, "this is gonna be one hell of a fuck!" Jess was right behind Alison, hands roaming all over the other girl's body in anticipation for what was to come. As the other girl lay back, Jess rubbed the head of her cock against Alison's pussy, moaning at the feel of the soft flesh against the sensitive head. She leant forward, pushing her way into Alison's tight passage. It took a few thrusts to open them enough for her to enter, but as the wet lips stretched around the massive shaft, Jess arched her back and moaned loudly. "F-fuck! So... tight! Ahh!" Every twitch that either girl made was sending jolts up her spine, which didn't help with how much her cock was twitching on its own at the moment.

After a bit to get used to it, Jess started to force more of the thick member into Alison's pussy. All she could think about was pushing more of her monster cock into Alison. A good thing, in hindsight, that the settings she'd made on the program would prevent Alison feeling any pain from the massive insertion as well as avoiding potential health problems. The fact was that no matter how long Jess fucked her, her pussy wouldn't end up stretched-out afterwards and be as tight as it always was.
 
Alison didn't need to be told twice, pulling away from Jess and almost tripping on her huge erection, flopping down onto her back on the bed and staring down her body. Her breasts were still just as perky even in this position, sticking up from her body with virtually no sag despite their size and apparent weight. Even more impressive though was Jess' new cock....all 18 inches of it. "H-holy....it's...it's....beautiful..." Alison stared, her hands twitching as if wanting to reach out and touch it, but there was no time for that right now. Moments later she felt the tip of the cock at the entrance of her pussy, Alison flopping back onto the bedsheets and gasping, taking hold of the bedsheets as it started to enter her. "HNG!" Whilst it wasn't painful the sensation was certainly....different. It kind of reminded her of the time Jess had taken her virginity with a strap-on that first night...she remembered the other girl being caught off guard that she was Alison's first.

"O-ooooh! M-more!" With barely the head inside of her Alison was writhing around, but she was desperate for more of it, she wanted to feel more inside of her....no.... she wanted... "A-all of it! Put it all in me please! I'm begging you Jess! I want all of your big cock!!" She looked up at the girl with a look or carnal desperation, as if her life depended on having all 18 inches of cock inside of her body. "F-fuck my pussy! Fuck my womb!" When Alison was using such language it was a sure sign to Jess that the shy nerdy girl had gone, replaced by 'another' Alison, a suppressed Alison, one that was an incredible pervert that was capable of making porn stars blush with embarassment.
 
Jess loved it when Alison got like this, it meant she'd be willing to try almost anything. And right now, that was getting filled with a foot-and-a-half of wrist-thick cock. Still gasping and moaning from the insane feel of Alison's pussy squeezing the life out of her cock, Jess kept forcin more and more of the thick shaft into her before finally hitting her cervix.

"Y-you wanted it in your womb," Jess said between shaky breaths, still trying to retain a little control, "so here you goooo-aahh!" She thrust forward, forcing the entrance to Alison's womb open and burying the last several inches of cock in the one motion.

Jess' cock twitched madly as she tried to adjust. The whole length of her cock was engulfed in Alison's pussy and Jess felt like she could cum at any moment. She started to slowly pull out and sink back in, crying out in pleasure as she did and she soon picked up the pace until she was pounding Alison's cunt with abandon.
 
Alison let out a scream as the cock pushed up through her cervix and into her womb, but it was a scream of pure pleasure. Her stomach bulged out around the outline of Jess' cock, now poking up at the base of her enlarged breasts. Alison's eyes were wide with pleasure, her mouth open and tongue hanging out as she drooled, her hands moving to her stomach and touching the outline of Jess' cock. "S-so good....so big....nnng...." Every twitch, every spasm, every movement sent a surge of pleasure through Alison's body, making her writhe around on the bed. "O-ooooh....."

She took a few moments to adjust to the odd sensation, though before she had fully gotten used to things she felt Jess starting to move, which made Alison cry out again, her hands moving to the bedsheets to grip them tightly. "Oooooh! Ah fuck! Y-your cock is so big! So good! C-come on...f-fuck me! Fuck me like a whore!!" Alison's tone was rather demanding...if she didn't get what she wanted then she would certainly take it.
 
Had Jess been in a normal state of mind, that request would've gotten quite a few ideas going. At that point, though, her brain was too fried with pleasure to think of much beyond trying to drive her cock into Alison even harder and faster. She pushed herself up with her arms to try and get more leverage before giving Alison everything she could, fucking her hard enough to cause the bed to shake and their breasts to bounce madly around, Jess' two pairs of tits not only colliding with Alison's but with each other as well. She was crying out in pleasure as much as Alison was and looking down to see the other girl's stomach stretch like that around her cock just added to it.

Jess' vision started to blur and she vaguely realised that she was about to cum. Before she could try and form words, though, it hit her. Hard. Screaming out, Jess buried her cock up to the hilt into Alison as it swelled even more, her eyes rolling back as an absurd amount of cum erupted from her cock straight into Alison's womb, quickly causing her belly to expand from the sheer volume. Jess' pussy wasn't spared either, despite the lack of attention, spasming madly as her juices ran down her cock and thighs. It lasted over half a minute before the seemingly-endless flow of cum finally stopped, leaving Alison with a roughly basketball-sized bulge to her stomach, none of Jess' cum having leaked out thanks to how tight Alison was. Her cock remained rock-hard inside the other girl, twitching occasionally as Jess caught her breath. "Well, how was that?" Jess asked, jokingly nonchalant about it. She also flexed her massive member just to see Alison's reaction.
 
The second that Alison felt that final hard twitch, the cock being buried inside of her, she knew what was coming. Even then she couldn't have quite prepared for the sensation. She felt Jess' cock erupt in an explosion of cum into her womb, almost instantly filling her completely and then filling her some more! The pleasure was so great that Alison couldn't even scream, all she could do was put her hands on her belly as she felt it bulging, pushing up as it filled with more and more cum, not a drop escaping thanks to Jess' thick cock, which now felt even thicker than when it had entered her! Alison came hard herself, her pussy juices spraying over Jess' mid-section, mixing with the girls own fluids to make a puddle around Jess' feet on the floor.

By the time they were done, Alison collapsed onto the bed, arms going weakly down to her sides as she twitched slightly, her belly now bouncing as well as her breasts, the large round bulge in her belly visible even past her hugely grown breasts. "O-oh god...." She panted, then yelped as she felt the cock flex inside of her, as big and hard as ever. "Th-that was....s-so good....holy shit....I've never....never cum like that before...." She groaned as she tried to move, then quickly decided against it for the time being. "Just....just what else....what else can this program do.....?"
 
"Whatever you want," Jess said, admiring the bulge in Alison's stomach, "one of us could become a cute little catgirl with tits as big as her head, or a six-armed Amazon strong enough to really fuck someone senseless with a two-foot cock. Whatever. You. Want.". Those last three words were each punctuated by Jess flexing her cock again.

"So if you want to make some more changes, better do them quick before I start fucking you again. Because if I start again, I'm not going to stop for a long while." She was already rocking her hips against Alison's - unless Alison said she wanted a break or a chance to make some more changes, Jess was going to go right back to fucking her. And when Jess was this horny, it took a fair while to calm her down.
 
Alison almost thought she was going to lift off the bed everytime Jess flexed her new cock, it felt harder than steel. She gurgled slightly, then wriggled her body, lifting herself up and pulling off of Jess' cock slightly. "Nnn....I think....I think I wanna see some more of what this program can do.." She grinned slightly, groaning as she slowly continued to slide her way off the other girls cock, until finally it slipped out of her. That brought new sensations in itself, almost immediately Alison's stomach gurgled and started to shrink as cum gushed out of her pussy all over the bed, the large bulge slowly becoming flat as cum was pumped out of her.

"F-fuck.....I hope....that program does....contraception....otherwise...ah....we've...got some explaining to do....to our parents....hng" She groaned as most of the cum pumped out, though there was still plenty left inside. "H-heh.....y-you turn....to mess....with my body on there..." She grinned slightly, sitting up a little on the bed. "Go on.....surprise me" Alison licked her lips, knowing that Jess was certainly going to take those words to heart.....and quite possibly make Alison regret them.
 
Jess was groaning as well as Alison pulled herself off the massive member, the thick shaft springing up as it finally left the warmth of her cunt. "Don't worry about getting pregnant," Jess said, getting up off the bed but eyes still glued to the flow of cum, "I checked that setting as soon as I realised the program could let someone grow one of these." She stroked her cum-covered cock to make it perfectly clear what she meant.

An idea or two was already going through Jess' head as Alison said she could mess with her body and she turned to walk to the computer with a bit more swing in her hips than was necessary and rather than sitting down, she simply decided to bend forward and give Alison a nice view of her ass as she worked.

The first thing she did was make Alison's breasts even bigger, roughly a G-cup. Then she added a thick, prehensile tail with a bulbous, cockhead-shaped end. It couldn't cum but it had all the nerve endings of a cock, making it more of a 'force-feedback' dildo. It was long enough that, unless they were 69ing, the tail could fuck Jess' pussy while they were in any position and fuck it as deeply as she'd been screwing Alison's. Before hitting Apply, she flicked over to herself and brought her own breasts up to G-cups while managing to round out her cock's length at an even two-feet. Finally, she gave herself an extra pair of arms.

Jess hit Apply on herself first after turning back to face Alison. Her cock was the first growth, the giant shaft lengthening a few more inches and getting slightly thicker then her four breasts followed suit, swelling even more while becoming even more sensitive. The new arms were the biggest change, of course, and she felt her arms... well, splitting is the only real description. Starting at the fingertips and working its way down her arms, the new pair grew out of the old, finally ending with their shoulders just below her normal ones. She couldn't help running her hands over her breasts, moaning at the feel of them and making her cock twitch and launch a small glob of precum onto the floor. Eyeing Alison lustfully, she lowered one hand back to the mouse, flicking back over to Alison's page of the program and hitting Apply, watching to see her reaction.
 
Alison licked her lips as she stared at her friend and sometimes lover walking away from her back towards the computer, then bending over and sticking her ass out. It was a good thing Alison didn't have a cock of her own or she wouldn't have been able to resist that urge to pounce the girl right there and do her over the desk. She was starting to get a little impatient until Jess turned around, clicking the apply button, Alison eagerly leaning forward to watch the changes. She gasped as the cock grew longer, pushing out more towards Alison, growing out to a nice two feet in length. If it had felt good inside of her before then Alison could scarcely imagine how it would feel now....not to mention how much it would be capable of cumming. The basketball sized bulge could very well be flat in comparison...
"Ahhh...." She grinned as her breasts all swelled up, growing larger and evening out in size, each one now nearly as big as Jess' own head. "Whoa...." She was so focused on the growth of Jess' breasts that she didn't notice what was happening to her arms at first, not until the split had reached the elbows. "H-holy..." Alison's eyes went wide as she watched, Jess soon standing there with four arms instead of just two, using them to play with all of her breasts. "Oh wow....."

Alison had been about to ask what was going to happen to her own body, but before she could she saw one of Jess' arms reach back to click apply. Moments later she felt a familiar tingling in her chest, then groaned as her breasts grew out even more, matching Jess' own in size. Afterwards, Alison felt something rather strange, a tingling at the base of her spine. "Huh...?" She fidgeted slightly, then gasped as her mid-section was lifted off the bed, something pushing her over onto her side, the girl shivering and groaning as her new tail sprouted, growing quickly to full size. "Nnnn....a-ahhh...." The tail whirled around rather randomly until Alison realised it was there, taking a moment to try and get it under control. "Wh-whoa.....amazing..."
 
Jess walked back over to the bed as Alison got control of her tail. "And I'm sure you can find some use for it," she teased, gently guiding the tip of Alison's new tail to her mouth where she lightly kissed the tip. If nothing else it would show her how sensitive the end was and suggest just what Jess was hoping she'd do with it.

"Now then," Jess said, crawling onto the bed and sitting next to Alison, her lower hands running along the other girl's thighs while the upper pair slowly ran down from her shoulders to rub Alison's breasts, "how about I fuck you from behind this time?" Her cock jerked at the thought of screwing Alison doggy-style - partly for a great view of her ass but also to make sure that her stomach would have plenty of room to grow once Jess came inside it.
 
Alison grinned slightly, then shivered as both her thighs and breasts were teased at the same time, a gentle moan escaping her lips, her back arching to push her body up against Jess' hands for a few moments until she pulled away. "Nnn.....you always did love that position...." She licked her lips, then eagerly complied with Jess' request, getting up onto her hands and knees on the bed, presenting herself to Jess, wiggling her ass teasingly.

Alison's new tail continued to sway slowly, the girl still only having partial control over it at best. It was as if it was desperate to fulfill some kind of purpose, instinct driving it to do....something...but Alison just could't be sure what it was. "Nnnn...c-come on....don't make me wait after all this.....g-give me that cock....the....the sooner you do....the sooner....I can have one....and show you....what it's like..."
 
Jess was always surprised that Alison's personality could put so many people off dating her - a shame too; she had a great body (particularly the ass currently being wiggled in her direction) and was a real demon in the sack once she got fired up. Heh, maybe I should give her a demon tail and horns sometime - she can certainly get horny enough to be a succubus, she thought to herself as she moved forward and started to rub her pussy with the tip of her cock before forcing the massive organ back into her. Jess kept two hands on Alison's hips, pulling her back onto her cock as she pushed forward, the entry this time being a bit easier thanks to Alison's pussy still covered in their combined juices. Her lower hands squeezed Alison's butt, playing with the beautiful cheeks before feeling herself run into Alison's cervix.

"Oh that's not gonna slow me down this time," she said confidently, getting a solid grip on Alison's hips with all four arms and slamming the rest of her cock home, crying out at the feel of her entire monster cock once more engulfed in such a tight, hot pussy. "Now, before I start to really cut loose," Jess said, breathlessly, she wrapped two hands around the last foot of Alison's tail, slowly wanking the thick, cock-shaped end before guiding it around her body and placing the end at the entrance to her so-far neglected pussy. "Come on, tail-fuck me good and hard while I fuck the shit out of you." She impatiently rubbed the tip against her dripping cunt lips, desperate for the thick tail to stretch her cunt out the way she was stretching Alison's.
 
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