My sister-in-law suddenly came to my house and drained me dry. (Kimi Kitano, VENU-526)

My wife went back to her hometown because she was pregnant, but then my sister-in-law came to stay at my house. It turned out that she was sexually frustrated and wanted to have sex with me. She even came in to help me wash my back while I was taking a shower. When she saw that I was erect, she grinned lewdly and started having sex with me...