If you're naive and think that this scene if farfetched in terms of a 13-year-old girl propositioning a middle-aged man, you won't be after you read The Allure of Nymphets, but what is farfetched about this scene is that the girl is mature and patient enough to advise Willie to wait until she is of legal age in North America.
For instance, in the book I wrote:
If you have any doubts about a ten-year-old being sexually attracted to an older man, take Elizabeth Taylor as an example. The book, Elizabeth Taylor: There Is Nothing Like a Dame (2012), related that when Elizabeth was ten-years-old, she made out with thirty-six-year-old [President] Ronald Reagan. She said, “Reagan was treating me like a grown woman, and that thrilled me. We sat on his sofa and I could tell he wanted to get it on but he seemed reluctant to make the first move… [so] I became the aggressor.”