He entered his sister's room without permission and saw her breathing heavily while staring at a porn magazine. She was engrossed in the magazine. Her faint sigh escaped. Her expression was something he had never seen before. He couldn't help but stare at her, but she noticed. There was an awkward silence. Her gaze was unfocused. He fled the scene out of embarrassment, but the two of them became aware of each other and were soon attracted to each other...