Stepmother incest approaches! ! mother's flesh

Koi married a man older than her. My partner is divorced, and on top of that, she has two children. Of the two sons-in-law, he was able to easily talk to Kazuya, the second son, but he hardly ever spoke to Minoru, the eldest brother, and had no idea what he was thinking. Moreover, since we are both close in age, it was a bit awkward... However, something happens and the distance between Koi and her step-sons suddenly becomes shorter.