Call a therapist. This is not just thinking, this is doing, and that's very serious. The repercussions of him doing this to someone else would be beyond your reaction of wanting to help him, and that is probably a frightening thought for you and your wife to deal with. You want to protect him from himself. I know this must be heart breaking, to see your son going through this, and it is a confusing situation for you to be in, to feel victimized by your own son, but also have no idea how to help him.

It's good that you're reaching out, though; that's how you are all going to get help. He probably feels shame and remorse for what he has done, and this compulsion needs to be addressed immediately, to figure out why his remorse is overcome by his compulsion to keep doing something he knows is wrong, even after he has been caught more than once.

I hope you can get help and that your son will understand why he is doing this and accept that this can not happen again, ever. I wish you and your family strength.