"Mmm... I will turn you back, doggy." Jeanie said as she caressed it. Slowly, the horse began to shrink, its horse muscles receded to dog proportions, its tail changed and its hooves turned into paws. On its head the mane dissappeared, its long neck became shorter and its muzzle turn back to a dog one. Its tongue was out during the process and it was visible how it turned from a thick horse one to a slim dog one. At the end, its dick began to change, as it was hiding inside its sheath, it became reddish and pointy, finally it was completely inside the dog's sheath with normal dog testicles.
The dog made a happily bark and began to jump and run all over, even between Marcus' legs who was still a horse.
"Ok, now Marcus..." Jeanie said as she turned to him. "We can continue... oh, you still have your penis out!"
"Oh crap! That's true!" Marcus thought.
"It's a very good endowment for a boy." Jeanie said. "You're a good-looking horse, Marcus."
"Hey! Don't talk like that about my... dick..." Marcus thought. "Come on! Change me back!"
"Can I thouch it?" Jeanie said as she kneeled before him.
"Oh no! Don't do that!" Marcus shouted on his mind. "Come on dick! Go back to the sheath! Come on! Dick, why don't you hear me?!!"
Jeanie didn't know what Marcus was yelling on his mind and she began to check his horse dick. As she touched its black skin, Marcus can feel how big it was.
"My little friend... you were so small and normal this morning and now you're a freaking monster..." Marcus cried on his mind. He felt how his dick was moving inside the sheath now. "Finally!"
"I wonder..." Jeanie said. "Where does your dick go went you put it inside your smelly sheath... it's like a cave."
"My smelly sheath... ugh... it's still hard to hear..." Marcus said but he stopped when he felt how Jeanie had put her fingers inside his sheath. She was playing a little bit with her fingers when the doggy came back and began to sniff the hole.
"Ok, I think it's enough." Jeanie said and at that moment, Marcus began to turn back to a human. His size and muscles receded, his fur, tail and mane dissappeared, his hooves turned into hands and feet so he was able to stand up. Finally, his neck turned back to normal, as well as his eyes, his nose and his ears. His face appeared from his muzzle, all in matter of seconds and like if he was made of clay. Marcus was the naked teenager he was a moment ago.
"Oh, finally!" Marcus sigh in relief. "Why did you do that?!! It's the worst thing I've experienced! That huge animal body... I felt so exposed!! And that sheath... ugh!! I feel sick of remembering that thing!!"
"Ups!" Jeanie said ignoring almost all what Marcus said. "I think I forgot it again!"
"What?!" Marcus yelled but then he realized what she was referring. He looked under him and noted a hole where his dick was suposed to be. It was sheat, a bare sheat under his pubes. "What?!!!"
"Um... so, that's how male humans look if they had sheaths like any other animal..." Jeanie said very calmly.
"Hey! Don't stay there doing nothing and changed it back!" Marcus yelled. He was so upset that it catched the dog's attention and it run toward Marcus. It put its front legs on Marcus' back. "Hey, dog! Get away!"
"Aww... I think it likes you!" Jeanie said but Marcus ignored her because he was struggling whit the dog. "Oh, I know what to do!"
Marcus was finally able to Ward off the dog, he took its front legs and he pushed it, but after doing that, he lost balance and he fell on his four. He tried to stand up but he wasn't ablet to do it. Desperately, he began to look around until he saw between his legs. His human sheath was tingling, like if some arousal was growing on him. After a couple of seconds of arousal, his dick began to come out from the sheath, but it wasn't his human dick, neither his horse one.
A red pointy dick slowly came out from the sheath and now was hanging between his legs.
"What?!" Was the only word Marcus can said before he quickly turned into a dog. Fur, paws, muzzle, long ears and a wagging tail took place over Marcus' human features. He tried to speak but a long dog tongue came out from his mouth in its place. A second later, a barking dog was where Marcus was before. The other dog, came back and go round the new dog that was Marcus.
"Marcus, I want to take a little look to Patrick. So, I will give you a short time before we have our DNA session, so you can play with the doggy.Have fun!" Jeanie said and she dissappeared leaving the two dogs alone in the park.