Three days ago, my wife left the house after a minor marital argument. By then, a typhoon was already approaching, and I felt more anger than concern. But a few hours later, the doorbell rang. When I opened the door, it wasn't my wife—it was her younger sister, Tsubasa, drenched from the rain. She had come to check on me. Mesmerized by her glossy wet hair, rain dripping from her jeans, and her soaked, see-through lingerie, I couldn't look away.