Basically you come up with the fictional idea and you start writing that story, but then in order to write it and to make it seem real, you sometimes put your own memories in. Even if it's a character that's very different from you.
“Then I got together with my brother and a friend and we decided to play dates. The more we played, the more we wanted to do it. And it got to a stage where we wanted to do it all the time.”