Wait so you, your sister and your wife play porn games together?
The adults in my family all play eroge 2gether!
Besides, my wife is bi and brings other women to our bed, fully informed about me, her husband, and this often, though not always, begins ffm 3ways, and me, my wife, my twin sister, and her husband, my best friend and brother in law, all grew up together, so we've already been through the whole "gotta fap" stage together so fapping off together in the computer room is nothing new to our family. We're a happy, fappy family!