The married woman invited on a hot spring trip initially resists, yet perhaps deep down desired this situation all along. She begins sucking on another man's cock, not her husband's, and her heart trembles with the taboo thrill of penetration by a stranger. Her desire mounts uncontrollably, until finally she reaches the ultimate act—taking every drop of his semen into her mouth. The transformation of this married woman into such a lustful creature unfolds in a way beyond imagination.