My little sister is usually clingy and sweet to me... Recently, there are times when I suddenly start seeing her as a woman, not as my little sister... Whenever that happens, I get an erection. I thought it was Ito that my sister saw me with an erection, but instead of being disgusted, she was very excited by my erect penis! Breathing heavily, that super innocent little sister said with a womanly face, "I want to put my big brother's big dick inside me!" My crotch was rock hard in this ideal situation!