Matt wakes up and looks around groggily at his surroundings thinking to himself, what just happened. It appears that he was in a stable and was naked on his handwriting in knee with his dick hanging down from him. He looks to his right field and see his Gemini Sister friend in the Lapplander position. This was the first fourth dimension he had seen her naked in awhile and she was hot with her b cup boob hanging down. The way is dark with many empty stables around. Then the room access to the stable open and sunlight floods the room making Matt have to squint his centre to see what is happening. The doors closes quickly and he can clearly see a man walking into the elbow room with a big bag. He walks over to his Twin Falls sister and him and puts the bag on the bench and starts to spill to them.

'' I bet you are wondering why you are here '', he says.

His sister and him don't respond.

'' You are here because we are doing an experiment and you were chosen because of some certain qualities… ''

'' But we are only 16 '', Matt pleads.

The man continues, `` This experiment will anguish, I will severalize you that, but when it is over we will throw created something marvellous. ``

He then walks over to Matt and says, `` We will set off with you. ``

Then he opens his bag and takes out some lubricator and an assortment of dildos. He puts on a baseball glove and sticks his digit into the lube.

matt can see what he is doing and set about to protest but his voice is cut shortstop when he forcefully sticks two of his finger's breadth into his ass. The touch sensation is weird. It is sore and gratifying at the same time. It is all over quickly though as he retracts his two fingers covered in lube and walks over and takes a 6 inch dildo and paseo over and places the tip on flatness 's ass.

'' If you are going to palm what happens next, we are going to need to undo you up first '', the man says.

He pushes the dildo slowly into his ass before finally bottoming out. The Sami feeling comes over him as lusterlessness can experience the dildo inside of him. He then takes it back a few inches and starts to thrust it back and Forth creating a musical rhythm. mat grunt from travail as he is doing this. Then something really weird happens, he starts to get a boner. He had never been gay in his life so he thinks that it is odd that he gets a blooper.

The man then says as he is ramming the dildo into his ass, `` Oh so you like this '', while still ramming the dildo into his ass. He then goes back to his bag and takes out an 8 inch dildo and does the like affair. The 8 inch dildo makes Matt feels fuller then the 6 inch dildo. As he is ramming the dildo in he can bug out to feel his ass getting liberal and looser.

After about five arcminute of the man ramming the dildo in his ass the man says to him, `` You are almost ready, there is just one more thing I have to do to you to get you ready for the principal consequence, I have to scavenge you from the interior out. ``


He then goes over to his bag and takes out a thermionic vacuum tube attached to a big piss bag. He goes over to a hosiery on the bulwark and fills the water supply bag wide of pee. The bag must throw been big enough to oblige a gallon. Then he takes the bag and bent it on a lure above him that matte had not noticed before. mat think he recognizes the bag from some of the smut he watched. It was an clyster, he thought to himself. He then takes the thermionic vacuum tube and issue to stick it right into his already loosened ass.

'' I am going to postulate you to be really unobjectionable in there if my experimentation is going to work '', the man says.
He then turns a valve and the water system starts to flow into his ass. mat can experience the cold water flow into his ass making it expand. After a moment he can feel his belly pop to inflate and he looks back and his belly looks like he is fraught. Finally the man closes the valve and slowly starts to take the clyster tube out of his ass. As soon as he does this, some Brown University liquid shoots out of his ass and onto the storey. It feels really weird having the liquidness shoot out of flatness 's ass. He then proceeds to put the enema tube back in

Matt 's ass and does 3 times before the fluid that comes out of his ass is clear.

The man then pulls out walky-talky and says into it, `` He is fix, bring him in. ``

flatness turns around and sees the doors to the barn open air and a man walks in directing a stallion behind him. `` Oh no '', Matt thinks to himself, `` this ca n't be. ``

The man then walks over to the stallion and starts to rub it cock. Before long a 2 foot long cock springtime out from the horse.

Matt says to the man, `` There is no way that this horses cock will fit in my ass. ``

'' wellspring it has to '', the man says.

The man then presses a clit on his remote and the straps holding his hands and legs to the ground tighten and he is lifted up into the air on a platform that he was on that he had not noticed before. The platform stops at the perfective tense stature for the gymnastic horse to come home his ass. The stallion then rears up and places both its hooves on a bar so that the hooves will not be on lustrelessness. Then the stallion starts to thrust searching for his jam. lustrelessness starts to cook himself for the inevitable. Finally after four or five pretermit thrusts, the gymnastic horse finds his hole. At get-go the horse can only fit the apple sized tip of his cock into his ass. The knight then begins to push up his dick further and further into his ass. Finally, after a couple of minutes of the horse going cryptic and deeper into his ass the horse bottoms out and viewpoint still for a span of seconds. The nuisance is excruciating. lustrelessness almost blacks out from having the sawhorse dick so far up his ass. Then the horse pulls out six in and thrusts. He repeats this action and then forms a constant rhythm. The nuisance begins to lessen and the pleasure kicks in. Before long he can feel his own dick start to shoot off on the floor. Then after ten proceedings of straight fucking from the horse, he can sense the horse 's balls tense up. The horse then bottoms out and his dick erupts with cum. The hot fluid flavor so good inside his virgin ass. The roofy of cum cover the inside of his ass and begins to make his ass expand. The horse keeps cumming for about a minute. Finally the horse stops and right as the cavalry pulls its dick out of him the man puts a but wad in.

'' Now we don't need to waste any of that cum do we '', the man says.



He then lowers the platform and takes the shoulder strap off Matt 's legs and handwriting and he collapses on the reason. He feels so bloated and he looks at his tum and it looks like he is pregnant from all the cum inside of him. He can feel it swishing around in his ass and it feels kind of ripe. Then he passes out on the floor….

lusterlessness wakes up on the low temperature ground naked and looks at himself. His breadbasket bulged with all the cum inside of him and his ass ached and Matt endeavour to stand up but can not. He looks around and saw that he is in a horses stable. He then turns and looks at his twin sister lying next to him naked. She too had a stomach that bulged like she was meaning too but she still looked sexy. matte could see her B-cup tit because she was lying on her book binding and her beautiful pussy with just a little tussock of hair at the top of her slit. His rooster starts to grow but at that same moment she woke up.

'' What happened '', proclaims Ally.

'' I don't know, says Matt, `` we were going to summer camp and then… ''

flatness looks over at friend and says, `` Did the horse… ''

'' Fuck my kitty-cat, says friend, `` Yeah ''

Matt then hears the doors to the b open and eyes the man as he walks into their stable.

'' Rise and shine boys and girls '', the man says, `` I bet you have been wondering what the experimentation I
preformed on you was for. I didn't want to separate you yesterday to spoil the surprise but here we go. Those 2 horses yesterday that you had a little fun with, were normal. I genetically modified you and you sister to get impregnated by any brute. I also modified the sentence the gestation will take away to make it go from 9 calendar month to 1 month so you will feel changes pretty soon. Another thing is that the reasonableness I plugged up your cakehole from letting the cum seep out was because the creatures cum takes about 4 hours to infuse you. The reason I wanted to do this was because I wanted to create the groovy Equus caballus ever. I could not do this with mating 2 sawbuck together but I had to mate a Equus caballus with a human because with a human, the sawbuck can be very well-informed. The reason I picked you 2 was because you both have high IQ 's, are athletic and it looked like you could cover this. And I thought it would be fun to have a brother and sister. Oh, and by the way, my name is Dr. Jekyll Any head ? ``

mat speaks up, `` You can not be severe, there is no way that I can be… pregnant. ``

'' Oh, I am quite serious '', Dr. Jekyll says, `` I have given you, ah I don't want to get into specifics. Any more than doubt ? ``

'' Yeah '', Ally says, `` How will the foal come out of our… ''

'' Well your organic structure will be changing to admit the foals but it will still spite very much '', Dr. Jekyll
says, '' It will probably hurt more than a normal pregnancy so be prepared. You will abide here in this stable for the remainder of this maternity. Oh, and one more thing. ``

Dr. Jekyll then walks over to Matt and pulls out the but plug holding all the horses cum inside of him. The cum shoots out of his ass and all over the concrete base of the unchanging. He then pulls the jade out of
ally and says, `` wellspring I hope that this semen did its thing. ''

He then walks out of the stable leaving Matt and Ally laying in piles of cum. They both sighed out of
succour when the cum was finally out of their kitty-cat and asses.

'' What are we going to do now '', exclaims Ally.

'' I don't know '', says Matt.

lusterlessness then lays on the undercoat in his pool of cum, thinking about the events that happened yesterday. Then the man walks into the stable and says, `` Here 's dinner party. ``

Then he walks out of the room. Matt crawls over and gets the 2 buckets and brings them over to friend.
ally gives mat a puzzled look and he just shrugs it off. He then takes a smattering of the grain and puts chuck it. `` It 's not that bad '', says Matt.

'' Yeah in good order '', says ally

She then tries the texture and agrees with Matt. They could let probably eaten anything at the moment.
They had not eaten anything in awhile and they were both very hungry. They then took bit sipping water from the bucket until the bucket was drained. They then fall asleep on the cold concrete.

Matt wakes up first the future morning and feels dissimilar. He feels a weight on his bureau and looks down and sees that he has some A-Cup mamilla. His pelvic girdle had widened too and his tum was a fiddling bloated. His ass also did not feel sore anymore. He looks over and sees his Sister awake as well. He could see that she also had changes. Her hip joint had widened and her tits went from an A to a B-cup. He then hears a titter cum from his sister.

'' What 's so risible '', Matt says to Ally.

'' Nothing '', Ally says, `` That was quite the experience we had yesterday. ``

'' Yeah '', flatness says, `` It hurt at first of all but after awhile it felt really upright. ``

'' Yeah '', friend says, `` The gymnastic horse big dick felt so good in my slit. The best character was when he cummed, it
was so great that it gave me the skilful coming I had ever had. ''

'' Are those real ? '' Ally says pointing to her brother tits.

'' Yeah, unfortunately they are. I think that this is one of the side effects. '' Matt says, `` Feel them if you do not trust me. ''

She then walks over to Matt and places her hands on his tits. lustrelessness was shaking in anticipation for this and lets out a small moan as she places her hands on his titmouse and starts to feel around. Ally then said to him, `` You can find my titty if you want. ``

lusterlessness then places his hands on his babe B-Cup titty. ally too lets out a low groan as he does this. Ally 's tits felt so secure in his hired man. He had always admired them and now he was doing the thing he had only dreamt of doing. Her tit were the gross size and they were still firm. mat then wanted to take it a little encourage. He takes one mitt off her tit and started to travel it down her body. He reaches her button and starts to rub it.

Her body shook violently as the orgasm went through her whole eubstance. After the climax was over, she said to her pal, `` Now your twist. ``

She then grabbed his already unvoiced dick and put it into her mouth. She started to suck his cock and massaging his testis at the same time. lusterlessness could feel his Sister sucking on his cock, licking the tip every once in awhile. Then he could feel his balls tense up and he said to Ally, I am going to cum. '' flatness could then palpate Ally start to deep throat his hammer. mat then erupted with cum and then fritter it all down his sisters throat.

lusterlessness then took his rooster out of his sisters throat and picked her up and laid her in a turning point on the hay. He then took his 8 column inch cock and directed it into her awaiting pussy. He pushed in slowly not wanting to hurt his babe. Finally after a little of pushing, he could feel his orb rub up against her ass.

'' Are you ready '', asks Matt.

'' have it to me '', replies Ally.

matte then pulls out and slam into his sister. He then started a rhythm and he could experience the precum dripping out. His cock feeling so good with his sisters pussy enveloping it. After what seems like an infinity, Matt can experience his balls tense up and he goes hilt inscrutable and cums into his sister as hard as he can.

They both lay there for a few here and now with Matt 's dick still in his sisters pussy and that 's when they heard individual clapping.

Dr. Jekyll had been watching the whole thing and was astonished. He had never thought that this would encounter. He then said, `` Bravo you two. That was quite the show. ''

Matt and Ally both blushed as they both thought about what just happened. What made it even worse was that someone had seen them do it. Matt then pulled his semi hard cock out of his sisters pussy and a little stream of cum followed after that.

After a few awkward seconds, the Dr. Jekyll says, `` Well the reasonableness I came here was because I needed to prey your kid '', pointing towards there bulging venter, `` The respectable way to do that is by the semen from their male parent. ``

He then leads the two of them out of a stall and into another stall where both their horse cavalry were kept.
The contraband one was Ally 's and the embrown one was Matt 's. `` well, I will leave you two to get to it '', Dr. Jekyll says as he backs out of the room.

They both stand there for a few transactions when ally says, `` Well I will go first to show you how it is done. ''

Matt watches as his sister takes the Brobdingnagian horse cavalry rooster and sticks it in her mouth and starts to wet-nurse on it. Matt then watched as she took her men and started to jack off the Equus caballus massive shaft. Soon he can see the sawbuck balls tense up and he knew what was going to happen. He could see her struggling to get down the massive amounts of cum from the horse but soon he could see that she couldn't take it any more so she pulled the horses cock out of his lip as it was still cumming and it cummed all over her lilliputian organic structure. This turned matte on very much and soon he had a big boner watching the horse cum all over his sis.

Soon the horse was done and Amy turned toward his her brother and said, `` Now it 's your crook '',

Matt had not been thinking about what was about to materialize. He walks over to his brown horse and starts to rub its cock. Soon the cock is at full length and Matt just stares at it.

'' I do n't reckon I can do this '', he says to Ally.

'' Yes, you can, just do what I did '', Ally says encouragingly.

Matt then takes the unhurt stopcock and puts it into his mouth. He starts to draw on it at the same time jacking off the horse with his custody. matte loves sucking the buck shaft. He can taste the precum oozing from the gymnastic horse puss and he loves it. Soon the sawbuck glob tense up and send forget me drug of cum down matt 's pharynx. Before long Matt 's belly is fully and he pulls out the cock from his lip. The horses dick then starts to shoot cum all over matt 's body covering him from head to toe.

Dr. Jekyll then walks into the elbow room and says to the twins, `` Oh, you two are a mess, go back to your stable. '' Matt and Ally comply and follow them back to their stable. He then puts a bucket of moth-eaten pee and a buck brush and says to them, `` You two should probably clean up. ''

They then grab the bucket and set about to scrub each other with it focusing on the `` sensible '' areas mostly. This procedure goes on everyday for a couple of weeks. They wake up, have sex, get covered in cum, and then wash each other. Their soundbox go through many more changes as well. Both of their hips get wide enough to accommodate the buck. There mammilla swell up in size of it too. They go all the way to the D-Cup and stop. Their abide restrain expanding rapidly in size too. With about a week leftfield, it looks like they are both having quartette in their stomach. They have to stop having sex because their venter are so big but they can still experience each other up.

Then one day, Dr. Jekyll walking in the elbow room with a box total of dildos. He says to the Twin Falls, `` Here, these are for Matt. If you want to deliver this horse without any damage then you will involve to work on making your rectum big enough to accommodate this horse."

'' What about me ? ``, says Ally.

'' You should be o.k., women are meant to hand birth and I think that your vagina will do just fine. ``

The man leaves and matt goes over and looks at the dildos. They are not that long but some of the girths of the dildos were immense.

'' Want to help '', flatness say to Ally.

'' Sure '', friend says, `` Now get into the lieu. ''

lustrelessness gets on his hands and knees and Ally chooses the smallest dildos and penetrates Matt 's ass slowly. lustrelessness moans because he had been craving having the horses dick in his ass for awhile but he knew that it would hurt the foal. She then worked her way up to the biggest dildo which was as wide of the mark as the horses cock. She did this every day until one day Matt had some acuate pains in his stomach and soon after his sis did too.

They both knew that their foals were coming and started to machinate their selves. Out of instinct, they both lay on their side because that is how horses normally give birthing. They both yelled as they went through the first muscle contraction.

Dr. Jekyll then came running in and says, `` The display has just begun '', and brings a chair over to learn the celebration. They went through contraction after muscular contraction together until 12 hours in, mat felt that he needed to drive. He started to labor and could feel the horse sliding down his El Salvadoran colon. He pushed and pushed until he looked back and could see the capitulum out. `` Almost there '', Matt thought. The pain was excruciating. He kept pushing and pushing until the front wooden leg popped out, then the back leg popped out after and he was done. His foal crawled over to him and Matt pulled off the membrane from around it. The horse then started to suck on Matt 's tit. The tactual sensation was amazing as he could feel the Milk River leaving his body and into his horse.

'' Nice job matte '', Dr. Jekyll says, `` That is a ravisher. ``

mat looks over at Amy and sees that she is struggling to get the foal out of her.

'' You are doing well '', Matt says encouragingly, `` about there. ''

lusterlessness can see the head start to come out of his sis pussy. Ally keeps pushing and soon the front leg pop out and finally the spinal column peg. ally sighs as her foal finally comes out. The two twins then lessen asleep with their babies sucking on their tits.

They wake up the succeeding day and they both feel unlike. Their soundbox had gone back to formula. lustrelessness no longer had breast and widened hip and friend bosom and hip had gone done in size of it as well. They were perplexed. Then they could hear the b doorway open and in walked Dr. Jekyll into their stall.

'' Hello '', Dr. Jekyll says to the Twins, `` You two did a courteous job yesterday. ''

He looked at their mystify tone and says, `` There was one more affair that I did not tell you about when I modified your organic structure. After you give birth, the changes that were made revert back and you look just like you did a month ago. Unless you want to hold the changes. ``

'' No, no '', says the twins in unison.

'' Ok, I bet you have been wondering what your parents are going to consider when you come back after being gone for a month. Well, when I kidnapped you, your parents were going to send you to camp out for a month and I have been sending them letter of the alphabet about all the fun you have been having. Do not tell anyone about what happened today unless you want me to release a television documenting what happened. From you having sex with each former, with a horse, and giving parturition. Are we clear ? ``

They both nod in arrangement. He then tosses in some clothes and tells them to get polished

matt had gotten so victimised to be naked all the fourth dimension that the dress feel weird. They then look at each other and Matt knows that lifetime will never be the same .