Youth laws and punishment in adelaide?

one of my friends is being charged with blackmail, 3x rape and child pornography. he is 17 and she is 15, they have been dating for about 1 year... now, its her parents that forced her to make these claims, and none except the child porn is true, as she has sent him photos of herself, but he deleted them shortly after receiving. i was wondering what kind of punishment he would be up for? if proven guilty? on her official report it says that its all a load of... so what will happen?