Incest Hiroyuki is sorry for being a perverted mother...

Izumi lives with her husband Shigeru, who is apart from her 2017, and her son Hiroyuki. As Shigeru was old, there was no "marriage" at all, but living with a kind husband and son was a life full of happiness that could be overlooked even without this. One day... my husband, who was walking along the street, gets hit by a bicycle. At this time, Izumi didn't know that meeting the man on the bike... a man named Minami would awaken her desires as a woman who was sleeping inside her...