Ty laughed at that, and said, 'OK, just a sec, I'll wish it away.'
Before he could, though, Erin had an idea, and smiled mischievously. 'Hold on. I thought of something I'd like to try.'
'Yeah?' Ty replied.
'How about you turn me into a boy and yourself into a girl, and we fuck like that?'
Perversely enough, Ty felt his cock twitch in anticipation at the idea. 'Uh... yes please,' he breathed.
Ty barely even had to consciously wish for Erin's suggestion to come true. Both of them held hands and looked at each other eagerly as Erin's body was flooded with testosterone and Ty's with estrogen.
Their bodies changed almost in perfect sync. Erin's clit engorged and swelled from its hood as Ty's cock started to shrink into him. Erin's pussy sealed up and balls formed inside it while Ty's balls moved up inside him and his scrotum started to turn into a vagina. Right as she- he- felt his breasts recede into his chest, Erin reached down to play with Ty's newly-forming buds and rub his- her- swelling nipples.
Once their bodies finished changing, Ty felt Erin's new cock resting above her slit, and shifted her torso to allow him to thrust into her. When Erin did, she felt like every synapse in her body was firing to pleasure her, and the feeling of having Erin's shaft fill her, and his balls slap against her flesh, was incomparable. To say nothing of how great having Erin play with her newly-formed boobs felt.
It felt just as good for Erin, who was getting to experience the dramatically different intensity of using a penis to fuck someone while they clench around you. He didn't expect to love it so much, and barely noticed the reduced pleasure compared to what he had felt from his vagina.
Both of them reached their peaks quickly and almost in sync. Erin hunched over Ty dominantly just as he had to her a few minutes earlier, and grunted at the unfamiliar feeling of his semen flowing from him as his cock spasmed and his balls twitched.
Ty clung to her lover's throbbing, firm cock with muscles she could barely control, her body aching to take Erin's seed inside. When she felt him ejaculate into her, she felt an intense satisfaction as the warm cum soiled her newly formed pussy, and she moaned inarticulately in contentment.
Once they came down from the high, the two kissed softly and cuddled. 'How was that?' Erin asked.
'Amazing,' Ty breathed.