As Mrs. Paulson was discovering her new ability, Ty was trying out different forms. He had turned himself into a full black horse, then a giant Belgian draft, and found that the animal's instincts and senses were granted to him along with the full animal body. He also found out it was a little harder to make himself human again, and had struggled to turn himself back into a full human from a full animal. It was like he wanted to 'lock' into being a creature, but he had resisted. What if he had let himself stay a full horse? Would he have stayed that way forever?
Now he was trying less risky things. Like making himself a girl.
Already Ty had slimmed even more, and his boyish facial features had softened. He looked down at his naked body and found his penis and balls had shrunken dramatically while a tiny slit was opening behind his sac. It was freaky as hell, but Ty kept going, letting his penis shrink away, a sharp pull turning his cock into an elongated clitoris before it tucked itself neatly into his new vaginal lips while the rest of him softened more. His hands became smaller, his features more delicate and feminine, and soon enough Ty was completely female, the gender swap successful.
He looked at his new girl body in the mirror and grinned. He was still Ty, but somehow the perfect female copy of his original self. He lengthened his brunette hair, stared at his small underdeveloped breasts, and willed himself into a properly sized 15 year old, in awe as she became a rather beautiful young lady with average boobs. Can't be Ty anymore, she thought, so I'll be Tyler. The sensations from the new vagina were tantalizing, so Tyler began exploring herself, discovering what her pussy liked and didn't like. She found her outer lips sensitive, the area under her clit especially nice to rub, and with fascination she fingered her new hole, exploring the depths of her pussy.
She played with her breasts with her free hand, squeezing them, pinching her nipples, moaning. But Tyler liked big tits, so she grew them to overflowing triple D's on her slim body. They bounced as she fingered herself, feeling a new and very different orgasm coming on. And when the young lady came, it was mind blowingly erotic. She let out a loud squeel, throwing her head back, her legs kicked out and trembled as her vagina pulsated, almost hungry for something to fill it.
Still shaking, Tyler looked around her bedroom for something to use, and indignantly found a screw driver that had a long phallic shaped handle. Good enough, she mused, and still soaking wet she slipped the screwdriver head past her lips and yelped as something snapped inside of her pussy. She looked down and her eyes went wide as a little bit of blood trickled from her hole.
"I... I just broke my hymen!" She whispered to herself, even more startled, and then plunged forth, fucking herself steadily with the head of the screw driver.
"Shit! Shit!" She cried, and bucked hard as she came a second time in so little time.
Once the experimenting was complete, Tyler cleaned herself up, healed her pussy, and stared in the mirror. "Huh." She realized. "I don't think anybody would recognize me now."