Mona smiled as she looked over her Ponyta partner, finding that apparently she had named her Millie, which did sound like something she'd name such a beautiful equine specimen. She smiled at her, petting her flaming mane as she found it not quite as hot as she expected, more warm to the touch and completely safe. Millie smiled back, nuzzling her with her muzzle, though she blushed as she pressed it into her decently soft chest.
Getting up and gathering her stuff, she beamed to her partner. "Ready to go on an adventure, Mils?" The Ponyta reared up and whinnied in approval, and with that the two took off running together, eager to see what the world held for them.
Mona would spend the next few days in awe of really being in this world. She would battle, tend to her Pokemon, visit a nearby town... it was a dream come true for her. Though, there was one thing she missed... Mona was a bit of a closet pervert, you see, and the world of Pokemon had a certain innocent air to it that was somewhat keeping her from tending to her sexual cravings. She was getting slightly more horny every day, but would always feel gross whenever she considered masturbating here. She resolved herself to just keep riding it out, for now.
And then, one day, while grooming Millie, she would freeze upon seeing something unexpected: Millie had a pussy.
It hadn't been there in the previous days; she would have definitely noticed something this big before. When she had groomed her before, it had just been smooth and featureless there. Now, she had a pussy that was winking right at her, along with a tight, doughnut-shaped anus under her tail. She even found small breasts below the pussy on closer inspection.
She gulped, feeling strange about this. Her adorable Ponyta had lady bits now, and they were clearly craving attention of some kind.
Millie had noticed her attention at this point, and, having smelled her arousal before, smiled as that same scent grew stronger than ever. She didn't seem at all bothered by the sudden new body parts she'd sprouted; in fact, she seemed quite pleased with herself. She loved her mistress... and this strange world was corrupting them to give her exactly what she craved.