I read that sex addiction is being argued as not an addiction but a disorder with underlying problems with mental health. things like having a rough childhood and a narcissistic father would qualify. these underlying problems create the desire to do sexual activities that are frequent and towards the fetish field. personally I would not make a big deal about the masturbating and focus more on communication on what's bothering him. do it now while you have a chance of him not completely shutting down from you. I know you've been trying but maybe a more lax approach where he doesn't realize how a light conversation got so deep and personal rather than an "overly concerned mother" approach. the more he thinks he's independent, the more he "won't need you". if he won't talk to you, make sure he doesn't stop seeing the therapist and if he decides he doesn't like him than let him pick another but don't let him stop. As far as the shower, let him see the difference in the water bills before and after it started and tell him if he continues long showers he can pay for it. As far as the sleep, leave articles on the effects of lack of sleep where he can see them and take away his electronics from bedtime till after school, or homework, or whenever you feel he's allowed to use them. if he runs away again give the police a call and let them scare him. that's what I would do. ps. I have noticed that people tend to open up if it goes two ways.