I Imagine Somebody Else Fucking My Wife Everytime I Fuck Her

My wife was waiting for me to pick her up from outside the school where she works as a Lab Technician. I young man (18) who she vaguely knew and who had left school only two weeks earlier walked past her. He stopped then walked back to her and whispered in her ear "I'd love to fuck you". Then he walked off again. She was taken by surprise so she didnt say anything to him. When she told me I said "shall we see if we can find him and he can give you a bit of young cock!" She just laughed and said "I should be so lucky" but that night we fucked and we both imagined the lad -she said his name was Robert - was in bed with us fucking her while I watched. We both ended up masturbsting before finally we fucked. I said she should try to find out where he lives and she said she would try to ic I was serious.... I convinced her I certainly was serious so now Im hoping my wife will soon be sampling a toyboy cock mmmmmmmmmm