As Karther's, or rather Master's cock pushed deeper and deeper into your body, changes started to ensue around your pelvis and pussy first. First, the skin around your pussy and asshole turned dark, and a fine thin layer of brown fur started growing around your asscheeks.
Karther thrusted again and you moaned louder, and his hands soon moved to your shoulders so he could better get a grip on you as the changes spread to your lower back and thighs. Soon an equine tail with beautiful black hair erupted from your rear and you felt the sheer muscle mass in your body increasing gradually by the second. The changes also increased your overall mass, which caused your body to grow and expand more. Your ass grew incredibly large, and your ass cheeks were the size of pumkins. Similar changes happened to your breasts as they swelled up to the size of watermelons, still retaining their firmness, but in addition to being covered by fur and their nipples turning pitch black.
You felt Karther stuggle for a moment as he lost grip of your shoulders, but he managed to continue nonetheless as you soon lost all feeling in your feet as they slowly changed into equine hooves. Your arms seemed to bulk up a bit in muscle, but it didn’t do too much aside give them the look of being athletic. Your fingers then morphed together, giving you three digits on each hand, and your nails formed large black stubs on the end of each finger. You still had your thumbs, thankfully, but the changes weren’t done yet.
Your hair grew longer and turned black and grew down to your upper back as your ears moved up your head and took their respective equine shapes. Your eyelashes grew longer as your complexion grew more and more feminine, and then your entire face pushed out and formed a huge equine muzzle in front of you. You were astonished, but too deep into your own sexual lusts to care. Your screams soon turned into neighs as your mouth was filled with flat teeth for grazing, and your tongue grew longer and thicker to match your new body.
Karther grunted more and more as he thrusted into you until finally you climaxed and screamed,"NEEEIIIIIGH!!!" Which filled the entire room right before Karther howled and released his royal seed into your womb, and afterwards you felt absolutely exhausted, and panted.
You were utterly speechless now, and you weren’t entirely sure how you were still on your hands and knees after all of that, and then Karther said,"Perfect, now your former masculinity will help strengthen my own, should be useful in the future, don’t you think sweetheart~?"
You looked back at Karther and nodded to him as you felt his cock slowly swell up inside of you before he growled and pulled out of you with a new glorious 14 inches on his cock, and horse sized testicles, perfect for you and your new body.
Karther panted a bit but gave you a large grin and said,"Stand up if you will, let me see how well you turned out as a mare."
You nodded to him and slowly stood up on your new hooves, feeling disoriented in a whole new meaning as you tried to balance on the ground with them for a few moments before you finally managed to get comfortable and look at Karther. You were the tallest person in room right now, around 6'9" tall by what you could tell, although it certainly was appropriate considering your species and assets.
Your ass was the most noticeable part of your body, but right behind it was your breasts as they blocked your view of your lower half a bit. Your breasts jiggled with every movement you made, and your ass did too but not nearly as much as your boobs did.
After Karther looked you from top to bottom he smiled and said,"Glad to see I have a more muscular gal now, although I can see I’ll need to go out of my way a bit to get you some.... custom uniforms due to your sheer size."
"Uh...ummm...." You muttered, blushing and then one of the concubines giggled,"Oh it’s not fat he’s callin ya hun!"
The concubine that spoke up had a particular southern accent that caught you off guard and you looked over at her as she waved to you and said,"It’s jus how ya horses are, nothin to worry about there! Always had large cabooses too, if ya catch my meanin dear."
You looked down at yourself and gave the concubine a small nod and said,"Okay then..."
"Ahem," Karther cleared his throat and all eyes were on him now. "Janice already told me your name 'Tommy', however a much more suitable name is in order. So from here on out you shall be known as Tonya, understood?"
You nodded to Karther and said,"Yes Master, crystal clear."
The other concubines nodded too and then Karther looked to the lot of you and said,"You’re all dismissed for now, but please give the new girl a tour. Janice, I believe I can trust that with you."
Immediately Janice ran up to you and wrapped her arms around you right arm and nuzzled it. You blushed a bit as you saw this as Janice replied,"Of course! She's my best friend of course!"
Karther nodded to her and then proceeded to leave the room, and there was silence for a few seconds as you looked to the other girls. Then suddenly all of them flocked to you and you toppled over onto your rear and each and every concubine seemed to want to meet the new girl. It wasn’t until that the girl with the accent barked,"Hey! Y'all are makin the poor thing nervous y'hear?"
Janice stood next to this concubine as she spoke and added,"Now, I’m sure you all want to get to know Tonya more, but she’s still new to this. So why not give her some space until we’re all comfortable back in our quarters with each other, alright?"
One by one the other concubines looked to each other and nodded, each apologizing before slowly leaving the room to you, Janice, and the other concubines who spoke up.
"You alright Tonya? Sorry, we just don’t get many new uh... additions." Janice said blushing a bit.
"Especially ones that ain’t another vixen like you!" The other added.
You slowly nodded to them and breathed a sigh of relief,"Thanks.... erm..... who... are you?"
"Name's Casey, used ta be a ranch boy, but now I’ve found a new callin. Master treats me mighty kind too, so what’s not ta love?" The other girl, Casey said,"Also didn’t want ya to kick one of'em... somethin like that would’ve injured maybe killed one of us."
"Want help up?" Janice asked and you shook your head and replied,"You sure you can even lift me Janice? I mean..."
"Yeah, was gonna mention that ya weigh a hell of a lot more than us, but figured it’d be insensitive considerin it’s your first day and I didn’t wanna come of as callin ya fat." Casey added.
You nodded to her and slowly got to your feet then you looked down at the two girls and your own feet and whimpered,"This is going to be hard."
Janice saw you struggling to stand and offered you her hand for assistance,"Let me help you walk then, okay?"
"Janice didn’t we jus talk about that?" Casey asked
"She’s my friend, and I don’t care okay?!" Janice growled
Casey held up her hands and took a couple steps back, and for a moment you wondered what had gotten into Janice. "Whoa hun, jus a thing to consider now." Casey whimpered then Janice sighed then whimpered,"I’m sorry, it’s just..."
Janice paused and hugged you tightly as she came up to your mid-chest area and nuzzled your breasts. "...it’s been too long Tonya, way too long." Janice whimpered.
You saw the tears in Janice’s eyes as she hugged you, so you knelt down and embraced her as much as you could without hurting her. "I know, okay? You don’t need to cry at all, just.... well next time don’t just tell a guy to kidnap me, okay?" You replied and Janice paused and looked at you as the situation turned awkward.
"I... uh..." Janice muttered then she nodded and you hugged her back and Casey crossed her arms and watched with wide eyes.
"Well, that jus happened, anywho Tonya, let’s give ya a nice tour of our cozy castle. Don worry, ya ain’t stayin in the stables, those are so poorly watched nowadays that it’s practically a breedin farm." Casey exclaimed.
"O-Okay then, well... lead the way I guess, just... god hooves are weird." You exclaimed and Casey opened the door for the three of you to leave and Janice helped guide you over to the door as you exited.
It seemed that the first stop on the tour was...