Ty's mind went to one person first- Erin. A 23-year-old nerdy student entering her third year of college who was tall, blonde and in Ty's opinion very cute, the young man- now young woman- had had a crush on her ever since she moved in four years ago. Naturally, he'd never acted on it even if they were good friends, but right now her brain wanted her- or rather him- so bad.
Without even bothering to dress she quickly she dashed downstairs, slipped out of the house and went to Erin's, letting herself in and seeing the most amazing sight as she did. Erin lay there, staring as if in a haze at his new penis, which stood erect pointing up in the air like an invitation. Ty's eyes were drawn to that large thick shaft too, and she felt herself moisten as she saw it. "Hi, Erin," she said in a small voice.
"Hey Ty," he returned, looking up and smiling as he saw a really beautiful girl standing over him. Erin carefully stood up, took Ty's cheeks in his hands and kissed him passionately. Ty kissed back and felt her nipples and clitoris turn erect at the boy's touch.
With the effect of Ty's wish, the ability of either of them to hold back the urge to fuck each other was practically nonexistent. Their transformed bodies ached to have their new forms' instincts satisfied, to get to experience the alien feelings of sexuality from the opposite perspective to the one they'd always had.
Erin carefully pushed Ty back to the ground and they continued to kiss as his large hard penis pressed against her skin. Ty looked down and watched as Erin positioned it, and a soft moan escaped her mouth as he pushed inside her. His shaft was so big, so firm, it filled her up!
Her body instinctively clung to his cock, and as he slowly started to thrust in and out of her, she felt her body ache to have him inside as he pulled back and practically sang with pleasure as he pushed back in down to the balls, which slapped at her soft skin.
The pace of Erin's thrusts steadily picked up, and Ty moaned appreciatively as he started to pound her. He soon moved his hands to play with her chest, and as he cupped her breasts in his large hands and pinched and rubbed at her nipples, it reminded her how feminine she had become.
Before long she felt herself peak, unused to the pleasure of the female body in sex, and clung to him with her arms, legs and vaginal passage, choked moans falling from her lips. As she came, her inner walls pulsed around Erin's penis, and he groaned and pressed himself as close against her as possible as he shot his warm seed inside her fertile depths.
Erin kissed her softly as he rested atop her, and Ty felt a sort of connection to former men all over the world, sensing how many had been castrated by her wish and fucked and impregnated by former women. Despite the stereotypes associated with her new form, she felt deeply contented and powerful right now.