My sister suddenly appeared at my apartment. As usual, she innocently ran around the room with a cheerful smile and started preparing dinner without asking. I could do nothing but watch her free-spirited actions. Late at night, exhausted, she fell asleep in my room. Seeing her defenseless sleeping face and her slightly more mature figure stirred something inside me. Unable to restrain myself, I reached out. And from that moment on, our story took a new and different turn.