22-year-old innocent-looking big-breasted college student "Ema," who works as an underground idol on weekends. She's approached with an offer for a free esthetic treatment and lured into a car. Despite her pure appearance, her surprisingly warm and approachable personality makes her charm obvious—no wonder she's popular in the underground idol scene. Hearing she's interested in beauty care, they begin a newly developed oil esthetic massage. Changing into a micro bikini treatment outfit, oil spreads across her legs, arms, and décolletage, as the therapist's fingers glide over her skin. She resists at first, worried her boyfriend will get angry, but when fingers slip beneath her swimsuit, her breasts' elasticity and sensitivity prove top-tier. Touched at her nipples, she writhes, gasping, "Ah, ah—No, no// I can't... I'm feeling it~," agonizing over how she's never been treated so carefully by her boyfriend. Mixing aphrodisiac into the oil and focusing directly on her nipples sends her sensitivity skyrocketing—she stifles her moans as sharp pleasure zaps through her. As the massage concentrates on her lower body, arousal juices flow freely. Then, using a standing vibrator, she unexpectedly climaxes with an involuntary piss orgasm. "Ah, ahhhhhh~"—endless squirting gushes out. Though she insists penetration is off-limits, her eyes stay glued to the cock. She voluntarily performs tongue kisses, melts under cunnilingus, and becomes a submissive woman. Fully awakened as a masochist, she begs for a blowjob. Her schoolgirl eroticism shines as she licks up from the base—thick cock plunges deep inside. Pulsing creampie after creampie fills her. That summer memory—her nipples and clit simultaneously tormented by the vibrator, crying out "so good, so good" as she sobs through relentless orgasms, the underground idol completely undone. Doggystyle shakes her large breasts wildly, her innocent face twisted in ecstasy as a massive cumshot floods her to completion. "I... I was so... so good... Is this... the latest esthetic treatment???"