I have a different sister from her father, she is Mizuno- a beautiful girl with a slim body. Due to the characteristics of work, my parents often go away from home to wear two sisters to take care of each other by themselves. When we were at home, we dressed very comfortably, cool, Mizuno did not even wear a bra. Because of puberty, our physiological needs are also very unstable, especially sisters. She often masturbates very carefree without paying attention to me. As a habit this time, she continued to masturbate and forgot to close the room, accidentally passing by I accidentally saw that scene. Because of curiosity, I was very attentive and was discovered by her. She boldly touched the little boy to make it erect and seduce, entice me to participate in the incest affair she was dominated by her.