John: Please see this thread a few lines below yours:
Befriended a teenage girl who needs help
Started by k207
Doing this sort of thing by internet/phone/text is very risky and many professionals will not interact on this level with clients for liability's sake. Please keep this in mind and protect yourself but letting the appropriate authorities (such as child protective services or the local PD) know what is going on. Yes, he will likely get upset, but if you suspect a disaster in the making, then it is worth risking the relationship to save a life (or many). Best wishes