Ken who was just starting to develop was beginning to feel a bit weird around girls who were developing a bit faster. He quickly thought of something that might make him feel more comfortable. He thought up conditions for puberty and turned the page and came up with a lot of really complicated stuff which listed so many factors. He just erased all those extremely complicated factors and then wrote in "when males touch females the female body develops their sexual characteristics. After growing a certain amount they will stop gaining said characteristics." then wrote in another few sentences "When females touch males the male body develops their sexual characteristics. After growing a certain amount they will stop gaining said characteristics."
Ken then closed the book and reality warped all around him. he looked around and saw that he was now in a room that was kind of different, then some memories came in. He was in a dormitory and he lived there with a bunch of his classmates for awhile. He was just writing in his book and thinking about gir-... wait what was that he was thinking of? Either way tomorrow is the day of an interesting weeklong overnight field trip to the amusement park next to the beach. His friends and himself would have a very fun time.
Ken was excited for the field trip but so were some girls from a different dormitory who had no ideas that boys even existed, just like the boy didn't know that girls existed here. This was mostly due so boys wouldn't go try to seek out girls or girls tried to seek out boys and develop too quickly, but now was about the age where they would generally meet together for the first time and figure things out about their sexuality and life.