Ty had an idea for how it might be fun to take these changes even further. In one of his biology classes about human reproduction, he'd learned how a fetus develops the genetic material used to produce its own offspring while still in the womb. He decided to regress himself to that point, pretty much the earliest point of the reproductive cycle.
As he wished for it, he felt his consciousness shift from the egg to some tiny strand of genetic material inside the egg. And in his mind's eye, he saw the parents-to-be of this egg- a male body with a pronounced erection, a female body spreading its legs to show a moist slit, and the two bodies fucking hard until the cock came inside the pussy. Once it did, the egg was surrounded by innumerable sperm and one pushed its way inside, kickstarting the life of the person who would bear Ty.
Ty wished for the zygote which contained him to grow and develop, and within minutes it had developed into a fetus. Now Ty anticipated finding out the gestating fetus's sex, which he would know from whether the gametes of the embryo would turn him into the source of its sperm or its eggs...