Just to put the record straight, it stated clearly at the beginning that the girl was his aunt's daughter, that is his first cousin. In most Western countries at least, certainly here in the UK, sexual relationships (if you can even call this incident a sexual relationship) between first cousins are NOT counted as incest, in fact marriage between cousins is perfectly legal.
Not that I approve of the story, in fact I think the guy was taking bloody liberties, but incest it is not. So, Brack, I think you're going off at half-cock here.
Sometimes I get the impression that there are people at this forum who are a bit too eager to sieze on the slightest chance of crying "Pervert!" just for the hell of it.