My son walked in on me and my bf and before I could explain to him what was going on he told my DH
My son saw and freaked out and before I could explain to him what was going on he went and told my DH.
We have a pretty open marriage. As long as we know about the other person it is okay if we are with them. It has been this way for a long time but the kids never knew.
My son was shocked when he found out. He though my DH and I were messing with him.
ETA he is 17