An American mother and a Japanese son's close relative

Osuke, who lost her mother when she was a child, had an American mother after her father remarried. One day, his father goes out and is alone with his mother at home. Yusuke was reading a book, but when she sees her glamorous mother cooking in the kitchen, she gets excited. Yusuke, who was starting to wake up to her interest in sex, gradually becomes unbearable and approaches her mother. The mother then begins to take Osuke's hands, gently and gentlely, and lead him into the adult world.