Stepmother's Sighs / Gibo no Toiki

The main character of the hentai Kaito fell in love at first sight with his father's new wife. Seiko herself looks like a quiet and exemplary wife, but inside passion and lust rage. In the end, their union was inevitable, and they crossed the line of mother and son, giving themselves to each other without reserve. Will their father expose Kaito, or will the betrayal and sin of the wife remain undiscovered?