With the brother who has been reproved... yeah, it can be unsettling. Don't know if you are in my congregation, but we have a brother in that situation that it's the same thing with me, pretty close with him, then this happened. I try to look at it as he repented and he needs us now, or else he may lapse back into his wrongdoing. But I try to upbuild him the best I can... more later
It's later so here's more.... with the brother who's reproved... I spoke with one of the elders in our cong about association with the one who was reproved. It was likened to someone who is reinstated, they need us and need to encouragement. Logical. In your situation, you may want to touch base with your local elders about how you feel and may want to have a heart to heart talk with the reproved brother, maybe letting him know that you need to take a little time to deal with your feelings. But touch base with the elders first to run it past them. About the 17 year old, again run it past the elders first, but I would again communicate wholeheartedly with him. Tell him you enjoy his company and want to encourage him to do more for Jehovah and help build a relationship with him. Try to help him to see all the good things Jehovah has done for him personally and maybe see where his mind is. But if doesn't want the truth right now, keep the lines of communication open and deal with him accordingly... there is a brothe rin my old congregation that was in that situation and stayed away for a year or two. He was all set to sign up for the Army when a ministerial servant happened to see him and they spoke... ended up studying together and the young fellow is baptized and doing pretty well.. hope this all helps!!!