Well, they waited until everyone was legal age of consent, so it isn't so much that within 1 minute they did it.. its that the story started 'in medias res'. Which is a lovely writing technique that skips a lot of the grind for modern culture. And she actually does have a slow corruption arc after that, even though bad exciting things keep happening to her. (Honestly I could go for it being slower just because I like her in her original mindset most, and am sad she starts embracing everything in order for scenes to be available >< )