Some boys may have their first encounter with sperm knowledge during sex education in school. They learn about how sperm are produced in the testes and how they are part of the reproductive process. This new knowledge can be both fascinating and overwhelming at the same time. For example, they might start to think about their future and how this biological aspect is related to having a family someday.
Sure. There are stories from a personal discovery angle. A boy might notice a change in his body fluid during puberty and then realize it's related to sperm production. It's like a new chapter in his physical development.