Noriko

"Aunty" Noriko as Marufuji calls her is a housewife and mother of Takehiko. Takehiko was one of Marufuji's friends, but he won over the girl Marufuji had a crush on which leads to Noriko consoling him. He takes this chance to hook up with Noriko and she becomes one of his girls, eventually getting impregnated by Marufuji.