Ty soon came up with a fantasy he liked the idea of: he had always wondered what it'd be like to have been born sometime in the past. He didn't know which civilization he'd most like to be in, but he knew with his wishes he could make it safe to live in regardless of things like disease, gender or prejudice. It seemed like it'd be a lot of fun.
He wished to move into the womb of someone from a historic time period and place, and while everything around him looked the same, he could tell everything outside had changed. He also realized that the woman whose body he had moved inside was preparing to have sex with a man who would impregnate her. Ty could not really discern when or where the couple were from, and kinda didn't want to- the mystery of his future identity felt intriguing. Not to mention how the pleasure from their fucking seemed to bleed through to Ty.
At last the man came inside the woman, and his seed raced towards Ty, fertilizing the ovum that contained him. As he moved into the woman's womb and impregnated her, Ty felt knowledge come to him from his sperm half. They would be born as...