Overview
One of your friends will grow into becoming an authority figure in your life, and you need to establish the ground rules before things get complicated. Make sure that the two of you have a serious and honest conversation about how this whole thing is going to work. You will taking a big risk with your relationship if you just assume everything will be okay. Get the rules established, and get them in writing if you feel you might need to refer to them in the future. Take this shift seriously.