"Jen, how's are big girl, did you get all that horny out?" Her mom asked as she trotted toward the new stable that wasn't there this morning.
"Um, yeah, I did." Jen replied.
"Good, you know you can't breed with this huge member." Her mom patted her massive penis, it sent a shiver down Jen's spin.
"Now you be a good girl and go rest, I'll go make dinner."
"Okay."
Jen trotted into the stables, closing the doors behind her, they were empty except one mare.
"Oh no, not again!" Jen screamed trying to get away, but the mare galloped toward her, lowering her head to level with her human pussy, it hit and Jen screamed in pain and pleasure as her back legs forced themselves apart, the mare sliding into her, another Clydesdale, taking massive amounts of room in her small pussy, bulging the flesh of her equine stomach out like a water balloon. The mare finished her climbing in and the bulge shrank, Jen crying in fear of getting larger in her bottom half. She felt her pussy warming up, it expanded and became anatomically for her lower half.
But then she noticed something in her upper half, she got warmer, she looked down at her arms and noticed the shell on her extra for was cracking, her arms became thicker, more muscular, her elephant trunk all but disappeared as she notice her face pushing out, becoming a horses head. She felt her ribs growing larger, her whole upper frame was getting bigger. It stopped except for the warmth in her breasts, they grew bigger, her once petite but ample C cups now growing larger, she watched in a mix of fear and fascination as they passed DD's, stopping just before FF's. There was a mirror in one end of the stable, she looked at her new changes and saw a truly anthropomorphic centaur, her large eyes taking in all she the changes, she shook her breasts they felt good.
"Wow, that is better, at least I match now."
Her mom walked in carrying a large kettle of steamed vegetables.
"Now you eat this all up this time, your a big girl, and I won't have my daughter starving herself."
"My daughter?" Jen thought "How can I still be your daughter? I don't even look human!"
"You know ever since that little accident with that magician you've seemed much happier."
"Y.. Yeah, I am."
"Good, I do like having you for heavy work around the house, now you eat and I'll be by in the morning to get the kettle, good night."
"Good night."
Jen took the ladle and ate a little of the vegetables, she had never liked them, but now they seemed absolutely wonderful. She looked around and found that she had a full size bed, as well as a shower and a flat screen television.
"I could get used to this." She thought grabbing the kettle and settling down at her bed to watch t.v.