Rin lives with her son, Kazuya, on a long-term business trip. One day, Kazuya's classmate Ashida came to apologize for being guilty of bullying Kazuya ... Rin, who sympathizes with his circumstances, apologizes obediently, begins to take care of her. However, Ashida's true intention to return her kindness is to Rin. As soon as she is alone, she forcibly makes a deal with her. Rin is worried about her unfaithful relationship with her son's classmates, albeit with her force majeure. However, her body can not suppress her aching because of the pleasure of her cock that she tasted for the first time in a long time.