My sister, who had stormed out of the house after arguing with our mother, came to stay for the night. The cause of the argument was her new boyfriend... As I struggled with my mixed emotions, I found myself sharing a futon with my sister, who changed clothes indifferently in front of me, leaving me at a loss for where to look. Unconsciously, I was tormented by thoughts... Just recently, I still thought of her as a child, but now her boyfriend could freely touch her body. My imagination and jealousy swelled uncontrollably, and I lost myself, committing an act against my sister.