Rina, a female teacher in a stagnant relationship with her boyfriend, gets excited by the robust body of a student's father during a home visit and indulges in carnal desire with him. The student who witnesses this lewd scene blackmails Rina into exposing herself in obscene ways. Shame turns into excitement as Rina eagerly takes in the student's penis. Her boyfriend becomes aroused by her forbidden relationship, revealing his twisted lust, and they affirm their love for each other.
