I’ve been fantasizing about it since he came to our house many years ago. My wife gave him a big kiss and he playfully pushed her down on the bed and began humping her. She giggled and it ended there but i noticed that my friend had an erection and I was stiffening too. He and his wife visit us a couple of times a year and my wife always mentions that he’s in terrific shape unlike me, who has gotten quite pudgy. Once when we’d been drinking my friend joked about what would have happened if he’d kept humping her that day. I told him that it never took much to get her hot and wet and that she probably would have let her fuck him right in front of me. He clearly still wants her and she’s obviously attracted to him. Having his wife here is a deterrent, though. Any ideas about how I can arrange this to happen?