Hiromu's father remarried, so he gained an older stepsister. Hiromu is quite shy, so he and Anna have not been able to get along. His stepsister is very beautiful and carefree in front of him. Since it is midsummer, the weather is quite hot. Anna often wears shorts and a T-shirt around the house. Anna asked him for a massage because she felt a bit tired. Being a young man, he quickly became aroused by this very seductive situation. When Anna asked him to massage her buttocks, Hiromu could no longer control himself! He lost control and couldn't stop! Being inexperienced, Hiromu quickly ejaculated. But it's okay, he can ejaculate multiple times in a row! At first, he refused, but his huge, hard penis, the strong and pleasurable thrusts made Anna unable to forget. She actively approached Hiromu, wanting him to satisfy her sexual desires. And their improper relationship continued from then on...