HUNTC-571 One day, I noticed that my innocent younger sister, who was a little younger and whom I had always treated like a child, had started to develop a slight curve in her chest. I couldn’t help but become aware of it. And then my little sister, who adores me, noticed the bulge in my pants… and then…

I’ve noticed that my younger sister, who used to be flat-chested, has started to develop recently. Her naked body used to mean nothing to me, but now I can’t help seeing her as a woman. Unaware of how I feel, she still keeps clinging to me as usual, and I find myself becoming flustered. I worry it would be the worst if she ever noticed, yet I still catch myself sneaking glances at her chest every day.

Then I realized that my sister had actually noticed something unusual about me too. Just when I thought everything was over, she suddenly came closer to me, and we ended up crossing a line we should never have crossed. The relationship between us as brother and sister changed into something between a man and a woman, and we’ve been spending our days with a new kind of excitement ever since.