"...make you my pet?"
Eileen was a little surprised by that, and asked him, "Do you mean, like, turn me into an animal?"
"No, uh, I meant..." Ty blushed, a little embarrassed to admit what he meant in case it sounded too kinky or, worse, insulting to Eileen. "Like, you know petplay?" The woman nodded. "I wanna do that, but like, I wish for you to be only able to act and think like an animal, instead of you roleplaying it."
Eileen's heart raced at the concept. Honestly, that sounded really hot, entrusting herself to him to care for and pleasure her while she could only act on instinct and desire. "OK!" she replied. "But only as long as you promise not to hurt me while I have the mind of an animal."
"Of course!" Ty said earnestly. "I'll wish for you to have the power to think and speak for yourself before doing anything more out there than just plain vanilla sex. Does that sound alright?"
"It sounds great," Eileen smiled, and she watched Ty's face concentrate as the boy wished to transform her mind.
"This is so wrong," he repeated, this time not with concern but with a sort of pervy thrill to what they were doing.
"Fuck yeah," Eileen breathed, which were the last words she spoke before the parts of her brain that controlled speech simplified until she couldn't understand or communicate with it like a normal human anymore. Ty's wish was erasing most of the more complex elements of her thought processes, many of her memories being covered over. Soon she couldn't think in words, only by images and instincts, and she realized the weird things she was wearing felt uncomfortable and constricting. It all felt weird, and yet oddly liberating, like she was reconnecting with what humans really are- just another animal.
At last she slid onto all fours, and Ty noticed her awkward shifting in the blue dress. He pulled it off her shoulders and helped her remove her shoes. When he tugged down the fabric between her legs, Eileen felt a primal pleasantness to her nakedness, one which was emphasized by the moistness of her vagina and the feeling of Ty looking upon it. It felt perfectly logical to her animal mind: she was a nubile female in the presence of a virile male, as she could tell from the big erect shaft concealed by the things covering his body, so naturally she (and, she guessed, he) wanted- if not NEEDED- to mate.
Meanwhile, Ty was in heaven looking at Eileen like this. It wasn't just getting to see her naked form that excited her, but the utter lack of regard for human conventions like modesty and chasteness. Taking Eileen's human intelligence from her in such an aroused state left only an animal in heat, and unlike regular animals in heat, they were both humans, so Ty needed have no reservations about mating her.
Ty giggled as Eileen reached confusedly for his bulge, and when he pulled off his shirt, unzipped his shorts and pulled them off with his underwear, her gaze became excited and aroused. She grabbed at his exposed hardness, as if to confirm that yes, this was a penis, and it could and would penetrate, satisfy and fertilize her. Ty whimpered with arousal as she did, and considered what to do next...