A month after my father remarried a beautiful and kind woman named Tsubaki, my brothers and I were completely smitten with her. We started to see her as a woman before we saw her as a mother. However, I was also annoyed by Tsubaki's constant doting on my older brother who was good at both academics and sports. Our relationship heated up when my father wasn't looking, and before we knew it, we were taking baths together. Then, one night, Tsubaki sneaked into the bunk bed where my brothers and I were sleeping...