One day, Naoto, who works as the secretary for Shota, comes to Shota's house. She says she'll take care of Shota while his father is away on a business trip. Naoto is a bit strict due to her job as a secretary, and Shota is a precocious boy who has been without a mother since he was a child and is curious about women's breasts. This strange cohabitation begins! The normally serious and beautiful secretary lets her guard down, thinking that the other person is a girl, but she gets caught up in Shota's pace and has her big tits fondled, her penis played with, and finally they have creampie sex... The escalating naughty pranks get the busty secretary into serious mode!