When he heard his lover ask that question, it took him by surprise. He remembered well how strange it had felt when she'd been pregnant, and wasn't sure someone as young as Ty should have a child. And yet, hearing it also made him feel weirdly satisfied. He'd just gotten to fuck this cute girl and knock her up, and Ty wanted to keep their child. Imagining her swelling up with a pregnant belly, knowing he had caused it, was enormously tempting, arousing even, to Eileen's male self. Managing to restrain himself for a moment, he asked, "Are you sure you want to?"
"Definitely," Ty replied. "Besides, if anything goes wrong I can use my power to fix it. I'll be totally fine!"
"Go for it, then," Eileen smiled. He took Ty's face in his hands and kissed the girl, who responded by kissing back deeply. Between her legs, she was moistening again, and Eileen could smell it, and felt his arousal mounting. His erection was returning, and a part of him felt like he'd just like to pin Ty down and fuck her and fill her with baby after baby...
He broke off the kiss, panting, and reluctantly said, "Ty, I... I think you need to turn me back into a woman."
"Oh! I'm sorry if-" Ty started.
"It's not your fault," Eileen reassured her. "I'm just really not used to how it feels to be a man. It's making me feel like I can't control myself. It feels like I'm turning into an animal or something!"
"I getcha," Ty giggled. "I know what it's like to be horny when you're a guy." She focused on fulfilling Eileen's wish in her head: turn him back into her old self.
Eileen heard himself pant just as vigorously as when he'd changed the first time, as his masculine hormones turned into feminine ones. He then felt something warm and wet around his cock, and groaned as he saw Ty sucking their juices off his manhood.
His muscles shivered and withered slightly, his hands and feet returning to their slighter proportions, and his figure shrank inwards so he had feminine curves once again. A warmth in his chest accompanied by much of his body hair receding into his skin made him realize his breasts were re-developing; he whimpered as he pinched his swelling nipples and eagerly cupped the soft flesh sprouting around them.
The mix of pleasure from his receding masculinity and her emerging femininity soon pushed Eileen to his peak, and he moaned in a heightening pitch and felt himself cum inside Ty's mouth. Ty swallowed eagerly and lapped up the juices left on his cock, so that once Eileen withdrew from her, his cock was clean. Just as well, too, as it was now changing back into its feminine counterpart.
They both watched eagerly as the penis and testicles which had just made Ty pregnant receded away. Eileen felt his phallus bind up tighter and tighter, all but its tip vanishing inside her while the head became her clitoris. As it did, his balls pulled up inside him, the space they had been inside flattened into a feminine mound, and his sac split down its seam into a vagina.
The Brazilian MILF Ty had crushed on for so long was back to her old self, and Ty felt just as attracted to her as she had when he'd been a boy- and when he'd been a man, for that matter. "Thanks for changing me back, Ty," Eileen smiled, leaning forward and kissing her. She'd never thought Eileen was bi before, but she'd never thought that about herself- changing sex seemed to be an eye-opener in that area.