so the premise of this doujin is something like a mom and son are taking a walk when they are given the chance to participate in a couples game for money (kinda like a public street game show), they claim to be a couple and accept. They are put in this one way room where on the outside people watch there silhouettes or something, with each completed challenge they get a cash reward. It starts with them having to kiss and escalates to sex, i think it continues afterwards,