Rino is involved in an incestuous relationship with her son Hiroshi, but deep down, she is drawn to Hiroshi's friend, Kenta. One day, upon learning that Kenta is coming over, Rino sends Hiroshi out on an errand and begins seducing Kenta. She takes him fully into her mouth, performing an intense blowjob. The young and inexperienced Kenta is completely captivated by her bold actions, falling entirely under Rino's spell. Believing their secret affair would last forever, their illicit bond continues—until something changes.