Riri had a brother-in-law, Shingo, who was the complete opposite of her gentle husband, Shinpei, in both appearance and personality. With an unstable job and no money, Shingo frequently came to borrow from Shinpei. One day, Riri went to Shingo's house to deliver money on Shinpei's behalf. Upon entering his filthy room, she was suddenly pushed down. Overpowered by the well-built Shingo, Riri was unable to move and was raped from behind. However, as she was pounded by his sturdy cock from the rear, Riri experienced a pleasure she had never known with her husband...
