肥水不流外人田。姐夫操小姨子，小叔子幹嫂子，把她兩當成狗一樣，換來換去的操！

肥水不流外人田。姐夫操小姨子，小叔子干嫂子，把她两当成狗一样，换来换去的操！
Good things should not go to outsiders. The brother-in-law exploits his sister-in-law, and the brother exploits his sister-in-law as well; they treat them like dogs, using them over and over again!