The mother-in-law whose father remarries and lives together is a woman who is not much different in age from herself. - She feels complicated, and her familys unity, kotatsu and skin-to-skin touch. - Erection with a lust for the body of a woman who is too young to call her mother! - The other party has the same feelings and secretly flirts in the kotatsu. - Eventually, the two of them couldnt control it and their father was close to them ...