"Go get yourself cleaned up and I'll explain. Go on, there's a bathroom behind that door." the voice directed. He lifted Katie to her "feet" again and she slowly stalked off. She was still a bit out of it, but was at least able to follow directions. Once in the bathroom she realized what had happened and what she was doing.
The bathroom was equipped with a sink, mirror, toilet, and garden hose. Looking into the mirror, Katie saw that, mostly likely while unconcious, her head and completely changed into that of a horse's. Her nose and lips were now black, and fused together. Her nostrils were large, and Katie could suddenly smell things she hadn't been able to smell before. Like heavy scent of cum on her body, and her own mare juices. Katie's ears were positioned at the top of her head, covered in fur and twitching to the slightest noises.
"What am I going to do?" Katie sighed. The man agreed to help her with her other "problem". With any luck he'd help her get back to her human form. Katie took the hose and turned on the water tap. Cold water hit her body, but she hardly felt it. The layer of fur kept her warm, and the dirt washed right off.
But Katie shivered when the water ran over her most sensitive areas. Her nipples stood out, erect from the cold water. And her pussy tightened and chills went up Katie's spine. She glanced down at her nether region. Aside from the smell, Katie didn't mind having such a large pussy. Having sex with the Shopkeeper was amazing, and Katie had no doubt in her mind that she'd be able to take an actual stallion if she wanted to.
"It's not like I'd be a human having sex with an animal." Katie thought to herself, growing a bit wet at the thought of letting a stallion slide his rod into her folds. For a second, her hand started to drift down, but then Katie snapped out of her daze. What was she thinking? Didn't she want to be human again? Katie continued to wash herself off, now very aware of how her new body was affecting her mind.
Once clean and dry, Katie walked back out into the shop. Her hooves made loud clopping noises, and Katie once again reminded herself that she wanted to be a normal human girl again. Not an animal. It took her a while to navigate the aisles, but she finally found the Shopkeeper.
Now that her eyes were clear, and her mind, she looked at the man with surprise. It was obvious he wasn't human, not entirely. She remembered the old man from her first visit to the shop. Was this him? Or was that a totally different person all together. Katie looked him up and down, unsure what to think. Aside from the large equine-like cock, he was covered in black hair. Aside from the white on his ankles, and the stripe down his slight equine muzzle. He was seated at a table sipping what Katie assumed to be tea from a large cup.
"Good, you're all cleaned up. Now sit." He said in a commanding voice. Katie wasn't about to argue with the man, but she was worried the chair wouldn't be able to support her.
"Just sit. It's sturdier than you'd think." the man said when he saw Katie hesitating. At first when she sat down, Katie pinned her tail to the chair, which amused the horse-man greatly. She didn't know if horses could blush, but knew that her face was burning with embarrassment as she sat again, this time making sure her new appendage was out of the way.
"Now, I can imagine you don't want to spend the rest of your life this way," he said, waving a hand at Katie's body, "And as I said before, everything comes at a price. No pun intended."
"What do you want from me?" Katie asked, understandably nervous. This man had a shop full of vials that could change people into animals and make them grow the genitals of the opposite sex. Katie shuddered to think about what else he could do to her. Turn her into a pooper-scooper.
"This is a one time offer. Refuse, and you'll be trapped in that form for the rest of your days. Now, I will restore your human shape. However, once a month you'll have to resume this shape, and the only way to return to your human form, is to 'service" me." I'll tie your transformations to the lunar cycle, so you always know when the change is coming. And an additional warning, should you go to bed with someone else while in your equine form, you'll curse them too."
"I... you're turning me into a... werehorse?" Katie asked in disbelief.
"I suppose that's one way of putting it. You will transform when the full moon rises, and with any luck you'll revert by the time the moon falls. But only after collecting my seed. As time goes on perhaps you'll learn to control the changes. But you shall always return." The Shopkeeper smirked. He knew Katie wouldn't be able to refuse the offer. The alternative was to remain as she was. And the Shopkeeper knew the girl wouldn't like that. This wasn't the first idiot customer who disregarded his rules. Those who declined his offer usually ended up government lab experiments, or living in solitude in the wilderness. Where do you think "Bigfoot" came from?