So I'm pretty positive that one of my very good friends older brother is a active hobbyist on this site and continues to bring up the fact that I'm a provider to her and who knows who else. I don't have any proof or facts for that matter, but definitely more than a hunch. I want to bring it up to him but in a way that he can't use that information to blackmail me. Confidentiality and discretion is very important to me, I choose to keep the hobby in my private life as most of you do as well.
Any ideas on what I can do to get him to stop gossiping and trying to expose me?