The sporty and vigorous schoolgirl Setsuna and her childhood friend Kin got a funny kind of brotherly and sister relationship. But Setsuna really want Kin so band and she often masturbates to him , One day after her swimming class practice and she's about to masturbate in the locker room, the door has opened and a middle age male teacher entered the room. Setsuna was harrassed by the teacher and he mentioned that he sees her masturbating. The pervert blackmailed Setsuna just to taste her sweet virgin pussy.