"Have you had sex with that girl yet?" Saki questions her daughter's boyfriend, Makoto, who has come to visit. She intended to give him advice on contraception, but it turns out that the two of them are not yet in a relationship. "Are you... a virgin?" Saki asks, and Makoto stammers shyly. Seeing this, a mischievous Kokoro begins to grow within Saki. She whispers sweet words and presses her body against him. She teases him with her adult charm and enjoys the virgin's innocent reaction. Then Makoto's crotch begins to swell before her eyes...