An 11-month incest life seduced by her younger sister

Even from the perspective of others, me and my sister Sora were good brothers inside. However, Sora has grown up and I have a girlfriend in college, and recently I've been spending less time together as a sibling. One day, when she thought she was living a good university life, she was deeply disappointed by her and was taken aback by her. Perhaps he felt sorry for me, and Sora kissed me, "Shall I become her?" From that day onwards, I began to be seduced by the aggressive nature of my life...