Maria Chihaya admits she is having an affair with her married boss at the gym, drawn to his gentle confidence, muscular body, and slightly sadistic side. During a hot-spring getaway, alcohol turns her aggressive: she licks his body and tries to drain him with vacuum blowjobs and handjobs. The roles reverse when he binds her with her robe sash, slowly teases her whole body, and makes her cum repeatedly with fingers and a vibrator. Wearing a racing swimsuit, her muscular, flexible body gleams in the steam as they have close-contact sex in the bath. Their secret meeting continues until morning.