I would also strongly suggest that you heed CDW's input. He is very well informed, both from a legal and a parenting POV. Disregard it at your and your son's peril.
I was directed to this thread by a member who knows that I've been in this situation (in NJ). *I* got a phone call from the young lady's father, who made it very clear that my boy was to have no further contact with his daughter or he would be going to the authorities. I told him I would handle...