Tohru was enjoying his brief freedom. His wife was away preparing for the birth of her child, visiting her hometown. He had no intention of using this opportunity to fool around with other women, and spent the time relaxing, watching TV and reading. But then his sister-in-law Sayu suddenly showed up. She said she had come to take care of Tohru, who was in trouble because his wife was away, but her target was her brother-in-law's dick. Sayu smiled seductively. The dangerous night alone between the two of them continued...