Treacherous Sisters
I am the younger brother to two very treacherous sisters. My youth is no barrier that my sisters have or might again show any concern for, from what they will like to make use of me to help delight them!
Cindy and Mandy were identical twins living in their lavish home with our magically educated parents, of Father being in the Wizard class, and dear mom a relative novice about the realm of anything made by magic. I am as was and am again Mike, the son and brother to my two sisters, we all living together at the family estate, as in a mansion, and on the grounds are two barns and one large stable housing several horses.
The horses were two Dutch warm blood type hunters our parents rode, as rode often with friends. Two matching horses were Palomino mares for my blonde haired twin sisters to ride when their spirits moved them. As I liked to ride and do show ring horse shows, my father actually bought for me what I wanted, as a gift for my sixteenth birthday came a New Forest pony stallion, that I named as Vaulthurst.
There were three other ponies residing at our family estate, not that they were there for my sisters to ride when they were younger. Donny, Bruce, and Eduardo the names of three gelded ponies, Bruce and Donny just showed up one Monday morning, they standing in the main pasture by the gate leading to the courtyard and stables beyond. Donny was all black his body fur, while Bruce being a red rusty color, when they arrived the two looked healthy for unshod stallion ponies.
Pony Eduardo was a mix breed donkey and Frisian, he black too, but his body coat like that of a donkey in thickness and feeling coarse. He had leg feathering hairs above his hoofs, but unlike the two other ponies, when Eduardo was found huddled as scared in a barn stall on Monday morning, he had the marks of being recently gelded by some amateur veterinarian.
Knowing my sisters as generally cruel when dealing with their boyfriends, I suspected the pony arrivals were changed school chums, learning how to restyle their lives and futures.
Our parents never did ask many questions about the odd three ponies, but I felt curious about their just showing up on a Monday morning after my sisters had gone dating to a school party. I knew my sisters from what they with their magical knowledge being more adept than mine, they often would try a spell put on me to have me entertain both Mandy and/or Cindy. As once, after Eduardo arrived, did I take note seeing my two sisters go to the stables late at night, near to midnight, and when there with me peeping, I saw them sit beside him, they taunting liked to fondle, stroke and arouse the odd male animal.
Our grandmother to my father offered to take my then eighteen years old sisters on a fun vacation with her to touring South America. When my sisters returned home, they had many tales to tell, some dealing with grandma and her magical toying with common people, and flaunting her unnatural youthful appearance at a few wizard friends.
My sisters looked to me as if they had come of age, like aged to seemingly being as twenty-one. They acted as brasher than ever before, telling me as if to taunt my being a male, of their adventures while traveling, and of a few fellow male humans who after dating my sisters, they ceased to be as relate to feeling akin to humans more than to liking goats.
I went to take a shower and having my own personal bathing shampoo and body wash, it was Cindy who tainted my body wash with a newly learned male enhancing potion. So then, as I showered the potion leeched into my skin and tainted my body. After my showering I felt weary and went to bed early, about nine, as had wild dreams of my sisters coming to me, they doing to me what I had watched them do many times to the pony Eduardo.
Cindy shook me awake about midnight, she telling me I had to go with her, as my being in the mansion our mother and father would not appreciate. I awoke in a dazed state, while hearing my sister clamoring about some reason to get up, as out of my bed and hurriedly leave the mansion for our going to the stables.
I recall my getting out of bed and for some odd reason I felt both naked and clothed. Cindy did her best and manhandling me, she shoving as pushing me to hurry along. I went, and once we had entered the stables, there stood a smiling sister Mandy to one side a box stall doorway.
"Quick, get into the stall as hide," I remember well Mandy saying to me.
I rushed into the stall as then Mandy swung the Dutch door closed, she slamming it shut and then slammed home the outer bolt lock to keep as held hold of what stood inside that stall.
The rush done, and as I stood there watching, hearing the thick wooden door slammed shut, it was like a gunshot sound working to jolt me alert.
"Mom went with Father, they left this evening, our dad received a call notification of a wizardry meeting he was to attend in Jamaica. So since they shall be gone for at least a week, we, your sisters thought this a perfect time for us to have you help by becoming a willful partner in a fun experiment.
When we were with grandma and staying at a posh Brazilian beach hotel, we saw there, women lying in sling hammocks under the belly of a stallion horse, and the stud having his erect cock slid up inside the vagina of his belly rider. There stallions are trained and drugged to remain calm while aroused, force to keep their cocks in an erect state for as long as eight hours of erotic good fun.
Since we do not know all there is to know of what drugs to use, we, your sisters decided to make use of you, our brother, as we used a potion to transform you. As for reasons of penis size, Cindy thought it best for all if you were of the "Pony of the Americas" breed.
You are as we wanted you a stallion, as similar your body fur coloration to the Appaloosa breed ponies, standing at the withers 11.5 to 14 hands high. Therefore, your cock is small enough to enter our pussies, while large and long enough to stimulate us without rupturing our internals, and causing lethal injuries.
Cindy ordered the sling saddle and has from her veterinarian friend retained a supply of medication to keep your cock in an aroused state."
Both of my goofy sisters liked the horses to give friendly licks, so they would strip naked and do their stable chores as naked. Their being naked tended to arouse the stallions and geldings, having their cocks to drop from sheaths, and stiffen, until they were beating them at their furred bellies. Mandy had learned how to best nestle her body below a stallion and with dainty petite hands she fondled the stud, as mouthing the cock-head and suckling it.
Their lust for actually having sex with a stallion made my transforming of self to being a stallion as an added safety margin, with me being my human brotherly, kind self, I would not act as brutal when forced to sexualize.
To be quite truthful, as I had changed while asleep, and awakened roughly, I became acclimated easier to being as is an animal, a horse type, and found being a stallion as feeling rather nice. Mandy took note of me and my lack of fight from being transformed. She offered me my first time of mating a real-born mare, as with some helping wooden stand for elevating me, I stood and breed with Mom's Dutch Warm blood mare.
When the next morning that Mandy arrived toting the belly rider sling saddle and the erection keeping drugs, I stood ready and eager to be of service to as for my sisters. When with the sling hung about my withers and tied to the base of my tail, I felt ready and willing for a sister to ride me in this erotic fashion.
"OK now get yourself situated into the saddle, and I will prepare the injection." Cindy said, as Mandy began to strip her sleek as sexy body to being naked.
Some sisterly bond of care one for the other, and Mandy was soon lying under me, as Cindy was messaging my sheath with hope of arousing my cock to become aroused. Cindy took my cock and began rubbing the head at the labia of my sister Mandy. I felt calm about this odd style of incest, although with me having become a stallion, the incest was more as if a sheer act of bestiality.
"Mandy, you are looking very wet and aroused..., oh nice, our stallion brother is getting stiff, I felt his cock head push past your vaginal ring. He is moving inside you; seemingly he too is enjoying this type of sexual fun." Cindy said to Mandy, as I let go a soft sort of whinny.
Indeed, I was fully aware and feeling as every inch of my elongated cock was sliding with remarkable ease as moving along the sexual tunnel of my horny sister.
Just as I felt it, Mandy felt something similar, as she said, "Oh brother of mine, you have reached the bottom and wow you are so huge. Do you feel it, am I anything like what you felt when mating the mare yesterday?
This is for sure the first time my younger brother has made me feel happy to have a brother!
"Mandy, are you crying, is he hurting you...?" Cindy asked, as she began to tug on my head halter rein.
"No, oh no, if I am crying it is from feeling ever so elated by my brother, he is making me glad we changed him to be a stallion, as I believe he too is elated about being a stallion." Mandy said, as she wiggled her butt causing my cock to wriggle up inside her wet pussy, making me feel my cock begin to come to near ready to climax.
When Cindy let go my rein and she retired to the toilet room for a rest on her thrown, I got the inkling of taking my sister with me for a stroll. As I took one stepped stride, Mandy let out one sexual disturbed moan. I knew she liked the sensations, as I felt them from my different angle and a stallion at stud point of view.
I strode my steps to make my cock work like a locomotive piston inside Mandy, causing a deep as harsh surging feeling, I wanted her to have some sexual suffering. As I left the stables building and took to walking faster, hearing my sister screaming, she begging of me to stop, but we move onward. I began then some prancing moves, as liked how my stallion cock seemed to stiffen more, as pushed harder, to deeper, maybe then I might wedge it inside her womb.
We were trotting together feeling closer than ever we had in our lives as sister to brother, when Cindy came running to meet us.
"You trying to kill your sister?" Cindy asking, she blurted out her question while below me Mandy was groaning and moaning, she crying, as trying to give her dear sister a reply.
A grab hold to my rein and I came to stop, as below me Mandy was begging of her sister to let the stallion have his fun romping running. "Oh you have got to try him, he is wonderful!" Mandy said, she complimenting me for my style of stimulating.
That ended the first day as the next morning it was Cindy what I took for a disturbing style of a horse ride. As with the third day both of my sisters took a four hour ride, beginning in the morning and coming to an ending at sunset. Our fun continued for the next two weeks of wild as sexual frolicking fun, until Mandy happened to bump into our Mom coming out to the stables, she of hopes to greet her daughters, her son, we her family.
Our novice mother saw there in the stables a belly rider sling-saddle and she knew what her daughters were doing for fun while their parents were away. It was when father arrived, as asked where was his son Michael, that I cut loose a loud whinny.
A knowing if novice mother knew enough from what her husband of twenty years had said and taught for her to know me as a son cursed. Dad came and looking at my two lusty sisters, he with a wave swooshing of his left hand sent the twin sisters off into a new oblivion and some temporary lifestyle.
"I am sorry for you my son, because your sisters are as much novices about doing magic, as they do not know the limitations and requirements." Dad said, as he then told me in magical details what Mandy and Cindy did to me came with a fourteen day limit, what by passing I would begin becoming then more permanently the likeness as my body being that of a horse.
My father is a grand wizard, he knowing just how to return me to being my human self. He decided the one best part of me to need leave as equine would not show as well.
ART: https://www.sofurry.com/view/1068037I had to agree with his choice and idea, as since that escapade, Mandy and Cindy are feeling their woes, while I feel mostly horny!
I like to run and met then, as discovered what father did for a reprisal to pay my sisters for what they did and almost made permanently happen to his one son.
Dad had promised me that as time passed, only my genitals would remain as of equine their shape, color, and volume of semen produced. As for many months I was an anthropic horse and very much a stallion.
I informed my father of our three ponies having been born as human, were school friends to my less than endearing sisters, and asked if father could do something for them as well. My father acted like a true dad knowing appreciation for his son and his son for his father. He using his wizardry powers, regenerated the three teenage school chums to being as again stallions, all three as if born to being brothers, stood proud being Welsh pony stallions with a pedigree, and registered in their respective breed stud book as leasable stud ponies.
Mandy and Cindy he made of them as anthropic Palomino mares, they being nymphomaniacs, beg of me to let them suckle my very permanently transformed maleness, drinking my spunk, we doing it six times each mare, of each day. That same fourteen day limit my sisters saw come and pass, meaning they are as they shall remain, each being mostly as a mare!
END