1週間後に出産を控えた妻が里帰り中の新田は、●校の同窓会で当時一番モテていた由菜（既婚）と再会。意気投合した2人はお互いレスだったということもあり一線を越えてしまう。その日を境に、妻にマウントを取りながら略奪寝取り中出しさせる魔性の女に毎日精子を搾り取られる日々が始まる…。

Nitta, whose wife is due to give birth in a week, is visiting his hometown when he meets Yuna (married), the most popular girl at his high school, at a reunion. The two hit it off and, since neither of them had sex, they cross the line. From that day on, Nitta’s days of being milked of his sperm by a devilish woman who mounts his wife, steals her and makes her cum inside him…