Ty was slowly coming to feel less compromising with Eileen's reluctance about him having her child. He could shape everything to his will- if things went bad, he could just make them work out. And after what the two of them had done, Ty had known he wanted to follow through on it more than anything he'd ever felt- ever imagined- in his life. Even if Eileen would not father their child, Ty would mother it.
Standing up and walking over to his closet mirror, Ty smiled and started to undress. He pulled off his T-shirt and threw it to the floor, then dropped his jeans and stepped out of his boxers. This might be the last time he wore boy's clothes for a long time, he thought to himself, anticipation further building up inside him. He looked at himself in the mirror, took a deep breath and then focused on his wish. Turn back into her girl self.
He felt and watched his body transform in a familiar yet intense way. His skin smoothed and he became shorter, and his figure contorted, his muscles turning more petite and his shoulders shifting inward while his hips flared outward. His face resculpted to have softer features while the pitch of his voice turned higher and his hair lengthened.
As the most dramatic changes came upon Ty's body, he focused more on the details of the changes as his sex reassigned. His chest felt warm, soft and tingly, and as he saw his nipples expand and grow more sensitive the pleasure was intoxicating. He breathed heavily as the flesh swelled outwards until he had undeniably sprouted breasts. Just to affirm it, he cupped one in one hand and felt a wonderous twinge of pleasure.
Ty could feel the last part coming, and his anticipation was intense. In a few moments, he would not be he anymore but she. His eyes peered down at his erection- the only part of his otherwise female body that made him feel he had to go by 'he'- and watched eagerly as it receded. The penis shrank away until it formed a tiny sensitive nub that would be her clitoris, his testicles moved up inside him and were reshaped into ovaries, and his scrotum tucked inwards and a slit formed down its centre as it became a vagina.
Once these changes occurred, in Ty's head something changed too. He became emasculated, and she became female. She was not a young man anymore but a young woman, and she liked how it felt to have this different role. Instead of getting others pregnant, she could get pregnant, and the way she desired to have her body pleasured was totally different. But she managed to focus on the wish she had meant to make after changing, and made it. She wished to get knocked up by Eileen's cum again.
The sex they had had shot through Ty's head- she felt like she was being held down and fucked by that handsome DILF all over again, and near-orgasmic pleasure raced through her. After it finished, the result of their lovemaking did the same, and the conditions were replicated inside Ty. She saw warm cum oozing from her pussy- a weird kind of arousal accompanied her realization that he had previously been able to do that, but now other people did that to her- and in her mind's eye she saw Eileen's tireless sperm surround her egg and wear away at it until one pushed inside and fertilized it, guiding it to implant in Ty's womb and make her pregnant.
Now she was pregnant with Eileen's child again, she just had one more thing she wanted to do. She wished for herself to age by a few months, and before her eyes her offspring grew inside her. It developed unusually rapidly, and she smiled as she saw her already fairly large breasts expand further to produce mother's milk, while her stomach protruded into a large pregnant belly, clearly containing a gestating foetus. She stroked the bump, imagining how beautiful the child would look, a mix of her and Eileen's cutest features.
She wondered whether to accelerate things or just be pregnant for a while...