my wifes unger sister by 5 years allways had bach ach years agowhen she was in her early 30s she would ask my wife if i could massage her back it hurt from her tailbone to her neck she would lay down on our bed i shut the door i pull her paints down below her ass cheeks then pull down her underware i could rubb around her ass and back i cock hard as a rock alway wanted to fuck her but my wifes family are old school they dont believe in doing thing like fucking others if your married im trying to convince my wife to fuck others but have not got anywhere im only person shes been with meet her she just turned 19 she now 55 any suggestions what i can do to convince my wife