Silky-haired, voluptuous Yumiko Kinoshita volunteers to test a product sample. Soon after drinking it, her body grows hot and restless and she eagerly asks to use the man's body for relief. Once she strips, the huge tits promised by her clothes are every bit as impressive. She wraps them around his cock for a titjob, then lets them bounce wildly through missionary, side, cowgirl and doggy-style sex. The session ends with Yumiko happily accepting a creampie.