遠距離の婚約者・健一を裏切り、同僚の拓哉と浮気を重ねるOLのひかる。ある夜の情事中、健一から着信が入る。拓哉の悪戯で繋がった通話。焦りながら平静を装うひかるだったが、恋人の優しい声を聞きながら激しく身体を刺激され、とろけるような快感に襲われていく。おいしい…グボッ！「あれ、なんかしてる？」未来を語る婚約者の声の裏で、必死に喘ぎを堪える背徳の淫らな唇。電話の向こうで太い肉棒が膣奥にズボズボ突き刺さる。もうダメ…！イッちゃう！！潮ブッしゃああ！極限のスリルに理性を狂わされた彼女は、電話なしではSEXできない変態へと変貌してゆく…

Hikaru, an office worker, is cheating on her long-distance fiancé, Kenichi, with her colleague, Takuya. One night, during a tryst, she receives a call from Kenichi. The call was connected by Takuya's prank. Hikaru tries to act calm, but as she listens to her lover's gentle voice, her body is intensely stimulated, and she is overcome with melting pleasure. Delicious…gulp! "Hey, are you doing something?" Behind her fiancé's voice, which speaks of the future, her lustful lips, consumed by depravity, desperately try to suppress her moans. On the other end of the phone, a thick cock is thrusting deep into her vagina. I can't take it anymore…! I'm going to cum!! I'm squirting! Driven mad by the extreme thrill, she transforms into a pervert who can't have sex without a phone call…