Erin had a thought that surprised him about this, but felt too enticing not to ask of Ty. "Is it OK if we stay like this? Maybe just for a while, but you know," he asked a little hesitantly.
"Yeah, sure!" Ty agreed. "I kinda didn't realise how nice being a girl would feel, so I'd like that too," she laughed. And with that she made the wish. They both felt a tingling sensation wash over them, and their new bodies felt more comfortable and natural to them as reality adapted to them being the opposite sex.
"I should probably get going soon," Tyra said, realizing that name felt natural to her now.
"OK! But it'd be nice to have you back soon," Eric replied, adapting to his boy's name. "Not just for this, I mean. In general, too." They both laughed and kissed as Tyra prepared to go and dressed herself.
Tyra had not given too much consideration to the result of their fucking, however. Deep inside her was now an ovum, and Eric's seed was racing through her trying to find it. Eventually they reached it and rapidly began to chew away at the egg's walls, both desperate to fulfil their biological purposes irrespective of the conscious desires of the people they had belonged to.
At last, one sperm broke through and fertilized Ty's egg, guiding it to develop into a xygote and lodge itself into the wall of Ty's freshly formed womb. Just 15 minutes ago, Ty had been male- now she was not only female, but pregnant.