GS-2027 Memoir, after that, incest plan arranged by a director for a husband

A director named Takahashi takes a request from a husband who, six months after learning about his wife's affair with her brother-in-law, wants to watch his wife have sex again, so the director beds the wife and then talks her into resuming the incest, with the husband filming from one side, but when the brother appears and joins in, it becomes a three-way with the husband involved. The plan spirals.