Don't Mess with My Sister! (1985)

Steven, a meek accountant-in-training, is living contentedly with his wife Clara and working for her brothers, managing the books at their junkyard. All of this changes when the belly dancer they hire for Steve's birthday turns out to be Anke, one of his classmates. Suddenly smitten, Steven begins to pursue Anke, who falls for him when he protects her from an overly lecherous customer. News travels fast in a close-knit neighborhood, however, and soon Clara and her brothers find out about the illicit relationship. Pushed to the edge, Steven will have to decide between his marriage with Clara and his love for Anke.