Although it was his first time dating a girlfriend... his virginity was taken by her mother. (Orihara Yukari, KEED-82)

Noboru is discovered to be a virgin by Yukari, the mother of his first girlfriend, Kanna. He succumbs to Yukari's allure, and she goes from kissing and giving him oral sex to deflowering him and taking his virginity for the first time! Although he feels disgusted, Noboru gradually becomes addicted to her mature vagina…