FSE

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New Found Fillies

By Von Krieger

Casey fidgeted in the passenger seat of the motorhome as it rumbled down the highway. There was a weird smell on the air that the AC did nothing to blow away, and there were faint moaning noises from the bedroom in the back, where his sick brother Peter was laying.

There were reports of a strange outbreak of illness on the news. They had everyone staying their homes, boiling their water, and avoiding as much contact with other people as they could. The symptoms listed were vague enough that some hypochondriacs would more than likely flood the hospitals thinking they had it.

Muscle aches over most of the body, shortness of breath, flushing of the skin, swelling in certain places, weight fluctuations at a rapid rate, changes in voice pitch, noticeable changes in skin pigmentation, unexplained hair loss or growth, increased appetite, hungers for usual substances, and severe personality changes were just the start of the list.

But that wasn't the main thing. No one seemed to be allowed to mention it, but the newscasters said that it would be obvious after a few hours once somebody was infected. The way they talked the disease was rather serious, but no fatalities had been reported.

Casey thought it was incredibly strange. After all, all the symptoms seemed like just minor annoyances at the very worst. There wasn't even the coughing up green crud that accompanied most colds. No nasal drip, no sore throat, just a lot of little things that could be really annoying. He didn't understand why it was such a big deal, or why his mother had packed Peter and himself up in the motorhome with the intention of heading to his aunt's farm.

They had gotten out before the National Guard had closed the roads; they lived in one of the most outlying suburbs, which caused Gretchen to complain endlessly about the drive she had to take to get to work at once of the hospitals.

Perhaps that was why they were headed out? That someone at the hospital had known something about the mystery disease and told Casey's mom to clear out of town. That would make sense, heading up to the isolated countryside.

The motorhome turned off on an exit, heading towards a MacRonald's. "I'm going to stop and get a bag of burgers and fries, and get some for dinner too and put 'em in the fridge. That way we won't have to stop again." Gretchen said, smiling at her younger son.

Casey just nodded, turned up the volume on his iPod and continued to stare out the window while he thought. He looked at all the cars in the MacR's lot and rolled his eyes. Lunch hour rush. They'd be there for at least 20 minutes. And with his mom inside, that meant he could go and get a good look at Peter.

His mom had said that he wasn't feeling well, and that he'd have the bedroom to himself while they drove. They'd stopped at a drugstore a few towns back, and Gretchen had apparently purchased some sort of medicine for Peter to take.

Casey also had been told that Peter needed his privacy, and that he ought to be left alone. Peter's condition was supposed to be a little embarrassing. The term 'priapism' had come up while Gretchen had been talking on her cell phone to somebody, which to Casey sounded more like a new age religion founded by some Italian guy named Priapi, perhaps based on Opera.

Casey had a bit of an overactive imagination. And as soon as his mom left the car and had been gone for a few minutes, he was going to sneak back and make sure that Peter wasn't turning into a zombie or anything.

That was a staple of zombie movies, the woman in denial about the status of her significant other, friend, or child, and it always ended up getting someone killed. Pained moaning, a funny smell, and a city wide quarantine all sounded like things that would fit in quite well with a zombie plague.

They pulled into the MacRonald's parking lot, taking one of the spots way in the back, which were actually the furthest away spaces from a Mall*Mart.

"You want to come in?" Gretchen asked, and Casey just shook his head again and pointed to the small, white ear buds of the music player. A few moments later his mom was gone, and Casey watched her walk to the restaurant. He didn't move an inch before she got in the door, and once she did he was up like a shot and quickly climbing back into the home portion of the motorhome.

He turned off his iPod and set it on the counter of the tiny kitchen, walked past the bathroom and the smaller secondary bedroom (which was actually a closet with a cot inside), before slowing opening the door to the main bedroom.

The weird smell that had been tickling his nostril up front now essentially reared back and dove right in. It was a weird scent, kind of enticing, nice now that he could get a good whiff of it.

The sliding window by the bed had been pulled open, allowing a bit of a breeze to come in. It was hot, stuffy, and the air was sticky and moist. Casey looked down at the form of his brother, wrapped almost from head to toe with blankets. There were wet spots on the carpet and on the bed. Though they seemed more from sweat that anything gross.

Casey reached out and slowly pulled the sheet back and gasped at what he saw. Peter looked... different; definitely not zombie-like, but noticeably different. Uncovered to the waist, Peter looked taller, and more buff than he ought to be. Casey could make out a six pack, but that wasn't what made him gasp.

It was the shape of his brother's body, the broader hips, the narrower, more streamlined frame, and the shifting of the face. But above all it was the hair, six inches longer than it had been yesterday, all of it honey blonde.

Peter moaned softly in his sleep and rolled onto his back, making Casey's eyes widen even further. His arms had been covering them up before, but his brother definitely had breasts; small ones, but breasts all the same.

Something else made Casey blush and look away, the tenting of the bedspread in just the right place. No way that could be real, as big as it was. The smell was really getting to Casey now, it made him feel weird, dizzy, short of breath, and kind of detached from his body.

He looked up at the tent in the bedclothes again, and then directed his gaze downward in shame. His eyes widened again at the similar tent in his shorts. Not nearly the same size, but definitely the same intent.

Casey made a bit of a disgusted face. It was pretty gross and weird. No way should he have popped a boner over his own brother; even if Peter looked all cute and kind of girly. His big brother's eyes fluttered and Peter's hand reached over and grabbed him by the belt, pulling him into the bed.

He winced as his hand landed in something warm, gooey, and sticky. But his panic was silenced by the pressure of Peter's lips on his own; soft, feminine lips. Peter seemed in a half-conscious daze as his other hand began to undo his little brother's belt and unzip his fly.

Casey tried to scoot away, not wanting to wake Peter up fully. He didn't want his brother to think he was some creepy, gay weirdo that had the hots for his own brother. Peter broke the kiss, his tongue trailing down his brother's neck, over his shirt, and then finally onto the head of his cock.

The younger boy whimpered softly. This was so weird, so very fucking weird. His brother's lips encircled his member, drawing it into his mouth; Casey couldn't help but moan over how good it felt. The thought had never crossed his mind that his first blowjob, hell, his first sexual encounter with another person, would be by his big brother. True, a big brother that looked a lot like a big sister, but a brother all the same.

Being all of 13, Casey had no staying power whatsoever, and with only a few bobs of Peter's head, he blew his load in his brother's eager mouth. Peter gripped Casey's balls, his grip tightening on them, making Casey shiver and erupt with another full powered jet of seed. The dazed boy refused to release his brother until he seemingly sucked the last bit of seed he could coax from Casey.

Peter pulled away and let go of Casey's belt, curling up in the middle of the bed and beginning to snore loudly. Making the most of the opportunity Casey quickly extracted himself from the bed quickly exiting the bedroom and ducking into the bathroom, locking the door behind him.

Only then did he take a look and see what he'd put his hand in. Cum. Thick, sticky cum. He'd seen the result on his hand before, always of his own making. But he'd never splooged as much as would have been needed to make the puddle he'd stuck his hand in. It covered each finger, his palm, and the wrist as well. It had seeped up enough so that it was almost on the top of his hand as well.

He looked down as his hard on, still poking out the fly of his pants. He was still incredibly hard, his cock begging for more attention. It had been weird and unwanted, but it had been so good and so.... sexy.

Casey unbuttoned his pants and tugged down the waistband of his underwear, taking a seat on the toilet. He closed his eyes, thinking of Peter; breasts a bit bigger, a little larger, but more feminine, still with the cock, but with something else between the legs; something just as warm, wet, inviting, and pleasurable as his mouth.

In a few minutes Casey's seed joined his brother's on his hand. Or it would have, had the seed not vanished rather strangely when Casey wasn't looking. However the out of breath boy didn't notice the absence. He looked at the pearlescent white pool in his palm and felt his mouth watering a bit.

He was curious, it might be a little gross and weird, but after all it was only his own. It didn't make him gay or anything. Nor did being mouth-raped by your big brother. Casey brought his hand to his lips, when a knock came on the bathroom door, making him jump.

"What?!" Casey said with annoyance.

"Are you okay in there?" his mother asked.

Casey snorted, "Yeah, of course mom, I'm just, you know, going to the bathroom. Why wouldn't I be okay?"

"Never mind. Finish up quick, sweetie. Food's ready and I don't want to be on the road with you on the pot." She said, moving away.

The weird urge that had come over Casey had vanished, he blushed and washed his hands in the sink, waiting a little bit for his reddened face to get back to a normal color, not wanting to raise any suspicion. He adjusted his pants and made sure there were no stray drops of seed, his or Peter's, before heading back up into the front.

The fast food bag was sitting on the counter, and Casey poked through it, pulling out two burgers and a large fry. He picked up his iPod and buckled himself into the front seat, his mind trying to make sense of what had happened.

His mother was in the bedroom, likely giving Peter another dose of the medication she'd picked up at the pharmacy right before them left, whatever it was. For someone who said she wanted to be back on the road quickly, she was sure taking her time. It was a couple minutes before she came back up to the front, sighing loudly. She tossed the bag of food on the counter into the fridge, alongside a second one.

Gretchen slid into the front seat and fastened her safety belt.

"You're not eating, Mom?" Casey asked.

"No... umm... I had a hamburger on the walk through the parking lot." She lied.

Casey knew his mom wasn't a very good liar. He figured she was just worried about Peter and didn't feel like eating.

"How's Peter doing?" he asked. A better liar than his mother, he gave no indication about his visit.

"Peter's doing fine, hon." Gretchen said with a smile, "The medication seems to be working, but it's made him pretty sleepy. He ought to be up in an hour or two. I'd like you to take him his food then, and maybe spend a little time with him."

Casey barely suppressed a shiver, "Are we going to get sick with what Peter has?" he asked.

His mom shook her head, "No, I don't think so. If we were going to get it, I think we'd be showing symptoms by now."

Casey nodded and began to eat his fries as the motorhome's engine roared to life and they were under way once again.

-o-

Casey's thoughts drifted increasingly towards his changed brother. The changes just didn't seem possible, a disease being able to affect muscle mass and bone structure to such a great degree in such a small period of time. And if whatever was causing the change was a biological agent, why hadn't anyone ever heard of a disease like it before?

So that meant that it more than likely had been engineered. What purpose would such a biological agent serve? One that turned men into women, while retaining the main male bit, and if anything, making it larger?

The only thing that readily came to mind was some sort of morale killer type thing for the fundamentalist Islamic nations. Kind of hard to have every girl covered up and unable to go out of the house without the presence of a male relative when all the guys looked exactly like all the girls, except between the legs.

With something like that, the increased sex drive would make sense. It had to be some sort of secret weapon developed by the US government or by a powerful corporation in order to have a psychological advantage in that particular part of the world.

From there Casey's mind began to wonder to the more personal manifestations of the illness. He was becoming increasingly curious as to how far Peter had changed in the past hour or so. The young teen also found himself wondering if Peter would be just as horny and cock-hungry while awake as he had been while in an unconscious doze.

He couldn't help but imagine a few of the things he'd like to try with his now quite feminine brother the next time they had an opportunity to do so. The situation was beginning to get more than a little uncomfortable as Casey felt as hard as a rock, and his pants felt a little tighter than he remembered them to be.

He looked down at the clock on the dashboard and then unbuckled himself, "I'm going to go see if Peter wants his lunch."he said, slipping between the two front seats.

Gretchen nodded and kept her eyes on the road, "I think Peter might be a little lonely back there. Would you mind keeping him company for awhile? You two can even hook the Gamestation 2 up to the TV in the closet if you want."

Casey's smile was concealed by the door of the fridge, "Sure, mom. I think we can find something to do." he said, grabbing the second bag of MacR's and heading to the back of the motorhome.

He opened the door and quickly ducked inside. The strange smell hitting him like a sledgehammer to the gut. He had gotten used to the light scent of it that managed to escape the bedroom and seep up to his seat. His pants felt increasingly more uncomfortable with every breath he took, and made even more so as he saw his brother, and what exactly he... she.... whatever, was doing.

The young teen stared with rapt fascination at his big brother. The small nubs of breasts had blossomed into a pair of melons that would be the delight of any stripper or porn starlet. The once shortish sixteen year old was now of a height that would make an NBA player proud.

But what drew Casey's attention was what was between Peter's legs, and specifically what the gender-warped teen was doing to it. Peter's member had to have been at least two feet in length, and as thick around as Casey's upper arm. It was longer in proportion than a human member was supposed to be, and the head was broad and flat. There was a circular bulge all the way around in the middle, and the skin seemed to change color along the length from what Casey could see.

The coloration was muted quite a bit due to the fact that Peter had a large party balloon stretched over his member as he masturbated frantically, panting and moaning in lustful bliss. The red rubber orb, emblazoned with a simple outline of a cake and the phrase "Happy Birthday!" was partially inflated. Casey could see some fluid sloshing about inside. Peter stroked his cock with one hand, while the other held the base of the balloon, making sure it didn't slip off of his shaft.

He paused for a moment, pushing a finger underneath the balloon's neck and pulling it open, letting some of the clear, slick precum that had built up inside run into the palm of his hand, allowing him to begin stroking at rapid speed once again.

Casey wasn't sure how longer he watched Peter stroke himself before his brother climaxed. It could have been seconds, it could have been hours. He was totally caught up in it, unable to take his eyes away from that perfect body making itself feel so good.

The young teen shivered as his brother's hips bucked, his/her lips parting in a sigh of relief, the birthday balloon rapidly expanding as it was filled with thick, white cream. Casey felt a sympathetic wetness bloom in his pants, his own seed gushing forth in synchronous climax with his brother.

Casey gasped softly as well, the bag of fast food slipping from his hand, which pushed against the wall at his side as he was overwhelmed by sensation. His cock spurted with full strength force again and again and again.

Once the pleasure dimmed and he was able to move again, Casey was aware of his brother's eyes on him, and the embarrassed blush on Peter's face. The titanic teen gave his cock a few final strokes, coaxing the last bit of seed from inside his member, and then slowly pulling the rather full balloon away. He pinched the neck and tied it off, then pushed it out the open window at the side of the bed, sending it onto the road below, where it no doubt splattered rather messily.

"I.. uh... brought you lunch." Casey said, his throat tight, a navy stain from his crotch to knees.

"Thanks." Peter said, equally as shy. His voice sultry, sexy, seductive, and most definitely female.

Casey bent and picked up the bag. He slowly approached the bed, extending his hand, giving the food to his brother. Peter gently gripped Casey's wrist and pulled him into a soft hug.

"I'm really hungry." Peter said with a shy smile, "But you... I...." his perfect skin reddened with a very deep blush.

Black nailed fingers slipped into the waistband of Casey's jeans, and with what seemed like hardly and effort, tore them straight down the leg seam on one side, and then the other, leaving Casey sitting in cum soaked boxers, which were soon similarly removed.

Casey found himself pushed back on the bed, his brother's head suddenly between his legs. Peter's large, thick, unnaturally long tongue slowly swiping over his skin, cleaning the scraps of sticky semen from his bare skin. His flagging erection raged back to full strength as Peter's lips encircled it, questing tongue lapping up every stray droplet of seed that it could find.

And then Peter broke contact, leaving his little brother wide eyed with what had just occurred. The elder brother smiled shyly and lowered his head, "If you don't clean it up right away, it really starts to itch." he explained.

The brothers' eyes met, and Casey reached up, running a hand through his brother's long, soft, golden blonde hair. A far cry from the brownish, dishwater color that their entire family shared.

"This is... really weird, Pete." Casey said softly.

"Tell me about it." his brother said in his seductive, girlish voice, "But I... kinda like it. It fell so good. I just... feel incredibly sexy. My entire body feels great, just... being there. I'm turning into a girl, I keep getting bigger, and I have a frickin' horse cock, and I... I don't want it to stop."

"It's scary, and what makes it scary is that I don't feel scared, or grossed out, or panicky, or anything. Just.... good. Sexy. Hungry. Horny. I... I couldn't stop myself from licking you just now. I could smell your... you know... and I thought 'I can't let that go to waste' and before I knew it, I had your pants off and your cock in my mouth. Again."

Casey blushed and looked away at that, "So you were awake for that, huh?"

"Not quite awake, not quite asleep." Peter said, "Y... you taste good."

"Thanks, I guess." Casey replied.

The two brothers sat in silence for a moment, which was broken by the crinkling of the MacR's bag as Peter lay back in the bed and pulled out a burger. He put the sack on his belly and stared up thoughtfully at the ceiling, eyes closed, mmming softly as he bit in to the comparatively tiny burger.

"What does Mom think about what's happening?" Casey asked, slipping off his shirt and kicking off his shoes and socks.

"She's really weird about it. She notices things, but she doesn't seem to... I dunno. She took a look at me, and with the whole size thing, the whole girl thing, and the whole being hung like a completely different species, all she said was that I'm a growing boy. She's been giving me sleeping pills, but at that last stop, she took a look at the bed and decided against it."

Peter shrugged and pulled out another burger, "I was making a real mess with my dreams. I guess she figured that if I need to... you know... that I might as well do it while being awake and able to control it. She seems to know about what's going on, but she hasn't told me anything. She just bought some stuff at the pharmacy and told me to use them."

The transforming teen nodded to the White-Aid bag on the bedside table. Casey rolled over and took a look inside. Packs of condoms, and three sizes of party balloons, one pack of 9 inch diameter, one of 12, and one of 24. The 12's were all black and the 24's all white. The 9's were a mix of colors.

"I got too big for the condoms at around 11." Peter said, which had been about 4 hours previous.

"Is it... still growing?" Casey asked, staring it rapt fascination at his brother's member, which had finally deemed that it was time for a break, and was in the process of going limp and retracting into a sheath. Peter's sack was equally as sizeable as his cock, with grapefruit sized testicles held tight against the body.

Peter had finished off the dozen burgers in the bag and had started on the six orders of fries. He dumped them all into the bag and tosses the packets aside. He pulled out fries by the handful, slowly nibbling on them with his eyes closed. His other hand had begun to caress one of his plentiful breasts.

His softening member promptly reversed course, filling to full erection in about a minute. Casey watched in rapt fascination. He snuggled up against Peter, his brother's skin soft and smooth against his own. His hand slipped between Peter's legs, cupping and caressing a ball, then slipping back, just to check, but found no female slit to fulfil the fantasy he'd had in the bathroom earlier.

Casey couldn't help himself, it just felt so natural to do, so right, it made him feel good. Peter stopped eating, setting the big bag of fries aside. He moaned as he took in a deep breath, both hands on his breasts. Casey smiled and moved his hand upward, tracing over the eager flesh of his brother's horse-cock.

Peter bucked, a deluge of precum erupting from the tip of his member, shooting a few inches in the air before gravity took it over and sent it dripping down his massive member.

The younger teen felt a sudden heat shoot through his hand. For a moment Peter's cock had been too hot to touch without discomfort. His eyes widened as he watched his big brother begin to change.

The already massive member quivered. It was as if it had only been partially erect before a new found blood surged into it. Casey watched it thicken before his eyes, felt it surge against his hand. He couldn't help but stare, jaw agape, as it grew longer, inch after inch after inch until it was half again the size it had been just moments before.

The transforming teen bucked his hips, black nailed hands tightly gripping darkening nipples that glistened with droplets of milk. Casey licked his lips as he saw those tiny drips. His own member throbbed with aching arousal, almost in time with the pulsing blood flow from Peter's still growing cock. It was huge, half of Peter's increased height, a good three feet at the very least.

Casey reached for the bag on the night stand, pulling out one of the 24 inch diameter balloons. Stretching the neck wide, he slid it over his brother's well-lubricated member. He gently coaxed one of Peter's hands from his breasts, replacing it with his lips and his own hand.

With Peter lost deep in the throes of his own pleasure, Casey took the initiative on his own desire. He pulled the balloon down as far as it could go on Peter's cock, stretched tight at the tip, but with still a ways to go, so there would be no breaking. The younger brother straddled the elder's member, bending it down so the huge length's tip rested between expanding breasts. He tugged on the balloon's neck, pulling it up just enough to slide his own cock in as well, the latex gripping the two of them tightly, with only a little discomfort.

Precum oozed through the narrow gap, the seal no longer perfect. It provided the slickness needed for Casey to thrust against Peter's member. The sweet heat of the huge horse-cock seeming to seep into him. He wasn't sure, but he thought he felt, for a moment, the pulsing sensation of his own member growing larger. But he paid it no mind.

He gripped Peter's cock with both hands, keeping the balloon from slipping up, and leaned forward, caressing the huge cock with his entire body. Casey brought his lips to a dark brown nipple. The nipple itself was a thick as two of his fingers put together, and stuck out three inches from the breast. The aureola surrounding it was the size of a small plate, the breast behind it filling with milk and expanding to the ridiculous proportion only seen in the most extreme of plastic surgeries.

Casey began to suckle from his brother's teat, the sweet milk that gushed forth intoxicating. It filled him with a sudden greedy hunger and bolstered his lust. Both brothers were too distracted by their pleasures to notice further changes to Peter. Changes that went beyond growth and feminization.

Peter's ears lengthened and grew smoother, shifting position just a bit higher on the sides of his head. Fingernails, already turned black, grew and spread, taking over the first joint of each finger, which was short lived. Five fingers became three, and five toes became a single hoof, the leg and ankle shifting subtly to allow walking on it.

The horseboy reached down with both hands, pulling his little brother tightly against him. For a moment so brief that Peter thought he might have imagined it, Casey's body felt burning hot. But all thoughts on that vanished as the mind numbering sensation of climax washed over him. There was a soft, muffled, wet sound between them as the high intensity jet of seed encountered resistance just as it exited Peter's body and impacted the balloon.

Casey was overcome with sensation, the pleasure of his cock, the sweetness of the milk on his tongue, the fullness of his belly that still demanded more, and the sweet, wonderful heat that sunk in through his muscles and down into his bones and back out again. He cried out in blissful delight as he joined his brother in climax, his contribution to the balloon paling in comparison to Peter's. After all, Casey lacked the bowling ball sized spheres that allowed such prodigious production.

He felt the balloon between them inflate, growing fuller and fuller with each pump from Peter's sustained climax. You double the size, you get eight times the volume. Casey was spent long before his big brother, and as he watched the large balloon fill, to the point where the seed was under such pressure that it was trying to push out the balloon's neck, coating Casey's member and sheath with the stuff.

The younger brother thought the word sheath, but didn't pay any mind to it. He scooted back, slipping his shaft from the shared balloon and allowing for a tighter seal. He thought of the 9 inch balloon and how it had barely been able to fit through the small, horizontally sliding window. Experience with water balloons told him that a larger balloon filled even part way was too heavy to move around. It tore the rubber and resulted in the contents going everywhere.

Looking around, he grabbed a pillow and stripped off the case. The balloon was still small enough that its weight could be supported hanging off of Peter's member, which allowed Casey to slip the case over it. They couldn't toss this one, they'd have to carry it to the window and spray it out the side. It would be delightfully mischievous, it sounded quite fun.

Casey placed a hand inside the pillow case, stroking Peter's shaft to draw out all the last dribs and drabs of seed, and then finally gripping the balloon neck, taking it in both hands, and slowly coaxing it free. The balloon was nowhere near full, and it didn't look impressive enough as it sat at the bottom of the pillowcase.

Peter looked down into the case as well, "I think we should try and fill it." he said with a giggle.

Casey looked up at his brother, he saw the changed ears, the fewer fingers, the feet that had become hooves. But the changes didn't connect in his mind to anything weird. He knew the horseboy in front of him was his brother and that was all that mattered.

"Y-yeah, okay." he said with a grin, allowing his brother to take the item, "Umm... I need like a clothespin or a big round marker or a pen or something so we can get it undone again when you're ready."

Peter grinned and shoved his little brother down onto the bed. "Hey what are you...?" Casey began to protest, but they he saw it. His still raging erection. His still raging, foot long, equine erection.

Casey gaped at it in awe. He shivered and moaned loudly as Peter's three fingers hand-hoof wrapped around it and began to stroke. "I said we ought to try and fill it," he giggled, "And it's your turn."

Peter grinned as his younger brother could only moan with pleasure as he jerked him off. He slid the neck of the balloon over Casey's cock and gave the balloon a bit of pressure. The young teen arched his back and thrust hard as a scalding explosion erupted in his body. The moment so much of his brother's seed touched his body, Casey felt electric.

The young teen crouched over the balloon, thrusting into his brother's hand and into the vast amounts of cum contained in the balloon. "Doesn't it just feel great?" Peter whispered into Casey's ear.

The younger brother could only not his head as his flesh began to feel fluid, like it was melting and flowing around into new places. Places that Peter caressed, making him shiver as they all felt so wonderfully sensitive.

"I guess it goes a lot faster with two people. Or when one is further along." Peter mused, a three fingered hand caressing Casey's shapely bottom, the sweet, feminine curves. He massaged growing muscles, elongating limbs, widened shoulders. All the attention made Casey howl with delight.

But what finally set him off, adding his comparatively tiny contribution of seed to the load was the icy sliver of pleasure that lanced through him the moment his big brother gripped one of Casey's B cup breasts for the first time.

Casey grabbed a discarded french fry packet and folded it in half, tying the neck of the balloon around the cardboard device. He virtually pounced his brother, his body just as feminine as Peter's had been when Casey had seen how much he had changed. Their lips met in a passionate kiss, and both were almost immediately fully erect from it.

Casey's cock had grown a few inches, to keep up proportions with his taller frame and larger body, but it still looked tiny in comparison to Peter's. He grinned, "I... I wanna try something." Casey said, his voice now just as feminine as his brother's.

Peter stroked Casey's long, soft golden hair, "Whatever you want, little bro."

The younger brother nodded and scooted away, gripping the elder's cock, his fingers, though a little larger, could no longer meet when wrapped around Peter's girth. He pulled it down, giving the tip a loving lick, moaning softly at the salty-sweet taste of plentiful precum, and bringing it down on level with his own member.

Aside from size, the two cocks were almost identical, same shape, same proportion, same medial ring, same shift of color from pink to grey, the same sheath with large balls brought up against the body.

Casey gripped just behind the board, flat head of his brother's member, keeping it still while he slowly slide his own into the opening on Peter's cock. Both brothers gasped in pleasure at the sensation. The warmth of the other adding to their own. The way the larger gripped the smaller and the way the smaller stretched the larger wide.

The two were so wrapped up in their lusts that they didn't notice the motorhome coming to a stop. Nor did they notice the door open. They did notice their mother walking in, she just smiled at them and commented, "It's nice to see you two playing so nicely together. I'm going to get some groceries to make dinner." she said with the same obliviousness that Casey had noted earlier.

It wasn't that she was unaware of the changes that had taken place. Nor was she barred from thinking about the oddness of it all, her sons were now shemale stallions, one still human looking, the other having huge hooves and sporting breasts, balls, and cock enough to provide mass for an NFL linebacker. It was just that they were happy, having fun, and feeling good, and that was given priority over everything.

Gretchen pulled a few things from her suitcase and slunk out of the room. Growing girls needed their privacy. And a few minutes later, as both climaxed, Casey's seed flowing into Peter, and Peter's seed splattering all over Casey, the two began to change.

"Mmm... so which one of us gets to be the mare first?" Peter asked, unable to see her new sex due to over endowment, but she could feel it. The shift in thinking for both of them came naturally. Before they had feminine bodies, but still retained masculine sexual characteristics. Now? While large, their members were the only aspects of manhood about them.

Casey giggled and reached for the pillow case, "Well, big sister, it's YOUR turn to fill up the balloon."

Peter giggled as well and looked down at her still growing member and balls, "And I think I will fill it this time"

-o-

Gretchen slipped into the women's bathroom, making sure there was no one else inside of it before locking the door. She tossed her bag of premilinary Mall*Mart purchases and hopped up on the counter herself, hiking up her long dress. She reached down and removed the belt, allowing her massive member to finally get blood flow in it enough to reach full arousal. Her cock wasn't nearly as big as either of her foals would get, but her balls rivaled Peter's in size. Her belly was beginning to grow quite rounded as well.

She wasn't pregnant, and she would never become so again. But she already had two beautiful daughters and had never planned on having any more. Offering a portion of her feminity for the cause was nothing. She knew of the cause only on an instinctive level, but she had been carrying it out as she drove and at each stop.

She had instructed Peter to gather his seed and toss it out the window. Likely it would just lie in puddles and perhaps enlighten a few animals, but with the sheer size her sweet little girl was now packing, she could hose down a windshield with semen sticky enough to make windshield wipers smear and make driving impossible. They'd have to go out and touch it, and once they did, they too would join to fight for the cause.

A soft moan escaped her lips as she began to stroke her member faster and faster. It felt so good to leave a mess behind as she had done in every women's restroom at every single stop she had made today.

Anyone who touched it would contribute to the cause, and would leave the mess where it was, where the word could be spread and the sweet, sexual bliss of transformation granted to all the mares who entered the bathroom after Gretchen had been in it.

With her balls as big as they were, it was getting difficult to walk, but a rig made of a couple belts and a t-shirt ought to provide enough lift. There were new t-shirts as well, as Gretchen could feel her belly beginning to swell as her ovaries became a second pair of testicles, allowing her to spread more of her transformative seed.

They had about five hundred miles to go before they reached her sister's farm. But who knows? Once Alice was made to know of the cause, and perhaps the livestock of the farm as well, they might continue their little road trip. They had a sister down in Florida, after all.

Gretchen sucked in a deep breath as she came, the stream of her seed powerful enough to blast across the room and splatter on the opposite wall. She'd have a few minutes worth of climax to paint the place white. She grinned as she gripped her dress with one hand and hopped down onto her hooves.

She loved them. She loved her new purpose, her changing form, the prospect of becoming a beautiful mare once her task was done. The hooves she had been promised was why she had packed the long dress in the first place. Everything was going according to plan. Just like Master Shadow said it would.

The very thought of her master intensified her climax, making Gretchen moan with utter delight as she began to coat the bathroom's entrance with her cum, making sure to keep it far away enough from the door that it wouldn't seep out. She'd smear some on the handle as she left.

More sex. More cum. More sisters. All for the cause. And perhaps, when she her herd had eaten a meal that would have feed them for a weeks as humans, she could snuggle with her daughters and have some real family togetherness time.

She just hoped the old motorhome's suspension could handle the amount of fluids that was about to head its way.