I came home early from work one afternoon and as I looked out the window to the back I saw our neighbors 16 yo son with his pants down. I snuck outside and moved closer and saw he was masturbating over my wifes panties on the line. I called out to him and he turned around with his hard cock in his hand and a pair of panties in the other. He couldn't stop apologizing and said it's the first time he had done it, I knew it wasn't. He begged me not to tell my wife and I told him it's okay I know your young and horny. I told him to wait there and I went into the house and came back with two of my wifes dirty panties from the laundry basket. I gave them to him and said these will be better as you can smell my wifes pussy. He was shocked and I told him to sniff them and I think he was overwhelmed. He said you don't mind and I told him he has to do something for me, he ask what and I told him I wanted a few pairs of his 14yo sister's. He said no problem I sniff them all the time and he jumped the fence and came back five minutes later with three pairs. I thanked him and as I inspected then there were little stains in them and on smelling them I needed to masturbate myself I pulled down my pants and started stroking myself and told him to join in. So there we were masturbating together him over my wifes and me over his little sisters panties. He didn't take long and he blew his load and the smell of this virgin pussy made me blow mine. We swap panties all the time and masturbate together regularly.