For three years, since her father's remarriage and the arrival of a new younger sister, Konatsu has been growing up. What once seemed like a child had recently started to feel more like an adult, and now, every night, she's being taken advantage of by her older brother, Oniisan. He's been carefully developing her body, making her more and more receptive, and she's unaware of just how much she's being used.
Every evening, Konatsu returns home from school, tired and slightly out of breath. Her mother, Okaasan, often asks if she had breakfast, but Konatsu usually declines, claiming she's not hungry. Still, the two of them share a quiet, familiar bond. Okaasan notices Konatsu's exhaustion, and she tries to help by offering her a cup of herb tea, something Konatsu had heard about from a friend. It was supposed to help her sleep better, and it did—deeply, beautifully.
But Oniisan, the older brother, had other plans. He had been taking advantage of Konatsu every night, and now, with the help of the herb tea, she was more open to it than ever. He had started off just testing her, but now he was going further, pushing her, making her feel things she never imagined. She was no longer just a girl who had to go through it—she was enjoying it, even if she didn’t realize it.
One night, after yet another intense session, Konatsu collapsed into a deep sleep, completely relaxed. Oniisan smiled, knowing he had completely taken over her body. He had planned this all along, and now, he was ready to take things even further. He wanted to make her his, completely. And with every night that passed, Konatsu was getting more and more used to it, more and more ready for whatever came next.
As the days passed, Konatsu's mother noticed something was different. She saw how tired Konatsu was, how much she had changed. But she didn't say anything, not yet. She knew that Oniisan was behind it all, and she had a feeling that this wasn't going to end anytime soon. What started as a quiet, almost innocent relationship had now become something much more intense—and it was only just beginning.
