Hanabi

If you hate the subject so much why are you even reading stories with minors having sex in it? It seems to be a growing trend on sites like this that people who hate those types of stories (or any story subject for that matter) will continue to read them while complaining about how disgusting and immoral the stories are. If it's not your cup of tea then don't read it. As to your question. No, it is not illegal. There are stories being sold on the shelves at this very moment that contain that kind of subject. VC Andrews books are the first thing that come to my mind.