A story depicting a married woman's heart and body trembling during a hot spring trip. With marital sex long absent, loneliness drives her into an affair. She experiences pleasurable delight from affection after a long hiatus, and when her genitals are licked, she writhes in innocent ecstasy. Referring to the penis as "ochinpo," she carefully examines it before sucking it deep into her throat. Despite feelings of guilt, she accepts the man's penetration, trembling as lewd words spill from her lips. They flirt and toast each other in the bathroom, then ride each other in the bathtub, floating in euphoric sensation. After soaking, they toast again, and she begins practicing how to seduce her husband. Gently teasing her lover, she mounts him, skillfully grinding her hips as he thrusts into her, climaxing repeatedly. Her passion shows no sign of fading as positions change, vividly conveying her relentless, multiple orgasms.