When my wife returned to her parents' home, her older sister's couple was also visiting. During that brief period, I ended up keeping a secret I couldn't tell my wife. Although the couple deeply loves each other and has sex daily, my sister-in-law and her husband only have sex once a week. As her sexual frustration builds, my sister-in-law's desires turn toward me, a member of her extended family. Caught in the complex web of familial relationships—brother-in-law and sister-in-law—this develops into a twisted incestuous affair involving seduction and betrayal. Despite the overwhelming guilt, I find myself experiencing pleasure and excitement unlike anything I've ever known.