There are a lot of things disturbing (but not surprising these days :?) about this story. The first question I had when I read it was ... why is a 15 year old still at an elementary school? http://www.wral.com/news/national_world/national/story/4598669/
Maybe he was a s l o w learner and she was just tutoring him out of state? Just kidding - shouldn't really, as it's totally disgusting. If his birthday fell in the wrong month, he could have started late, or maybe he got left back a year?