In a luxurious mansion in Seijo, Setagaya Ward, the 27-year-old stepmother—a slender, beautiful lady from a prestigious family—lives with her new husband. Originally a naive, innocent girl who couldn't even give a proper blowjob, she's secretly trained by her stepson behind her husband's back, gradually transforming into a full-blown pervert. Once completely unfamiliar with erotic pleasures like vibrators, she slowly begins to awaken to lust under his control. During family gatherings, he turns on a remote-controlled vibrator hidden inside her pussy, watching her squirm with pleasure while her husband remains clueless. At the front door, dressed only in gym shorts, she shyly begs a delivery man to insert the vibrator instead of signing for the package—her shame and arousal intertwining. When her husband returns home, she eagerly pulls down his pants, transformed into a vulgar woman who can't live without a cock, pleading, "Let me taste your smelly juices." This film captures her complete descent into depravity as a sex slave.