Once the two of them had recovered, they kissed a bit and giggled at how weird the changes they had given themselves had been. "This was really fun, but I think we should probably change back. My mom would be really confused if she saw some random guy and girl naked in my room!" laughed Rebecca.
"Yeah, good point," laughed Ty. Once Rebecca had pulled out of him, he wished for their bodies to return to normal. Instantly, Rebecca started to shrink back to 5'2 and Ty grew back to 6'2. Rebecca's bust sprouted back and Ty's vanished, and the girl's package slurped back inside her while Ty's pussy sealed up and his penis re-emerged. Both of them were overwhelmed with hormones brought on from watching and feeling the changes, and once they finished, kissed softly while still naked.
"OK, we really do need to stop now," giggled Rebecca. Ty agreed, and slipped out of the Paulsons' house to head home while Rebecca got on with her homework.
That night, though, neither of them could sleep. Rebecca's head was full of leftover lust from memories of fucking Ty. She turned on her light and headed over to her desk, instinct overcoming common sense as she started to grind on her desk. Her crotch looked and felt... empty like this. She remembered how empowering it had felt when her pussy sealed up, her balls emerged inside and her clit swelled to form a huge penis, and she imagined how cool it would've been if she'd gotten to knock Ty up when she'd cum inside him.
Next door, Ty was also feeling horny and disconnected from his normal self. He'd been feeling like his package got in the way of where he wanted to have a slit, a new and insatiable urge to be cummed inside brewing in him. Like Rebecca, he hadn't been able to hold back his horny urges that night, but unlike Rebecca, he had his powers to do something about it with- he'd reconstituted his body into the one Rebecca had fucked, forcing his penis to shrink to a clit, opening out a slit between his legs, and giving himself his DD breasts back. As soon as his changed body had returned, he'd started playing with himself, humping against his hand and cupping his boobs and imagining Rebecca filling him up again with her semen, but maybe keeping the result this time.