Exclusive star Kanna Sannoki joins the popular clinic devoted to developing the Spence gland—the breast's own G-spot. She doubts it at first, but expert stimulation soon makes her sensitive J-cup body tremble through her first breast orgasm. Pleasure hits far harder than expected, sending her into repeated convulsions and squirting fits. Toys make the breast tissue so sensitive that she can cum during a titty-fuck, and three full sex scenes keep developing her until a breast orgasm finally makes her black out.