Slender mature beauty Hikari Kisaki joins the popular series devoted to developing the Spence mammary gland, billed as the breast's G-spot. A specialist stimulates it until she experiences her first breast orgasm, arching back, drooling, and screaming as the new pleasure overwhelms her. Her already sensitive tits become one huge erogenous zone; mammary stimulation makes her black out, toy play leaves her weak and incontinent, and nipple-focused sex ends with her convulsing in a mess of bodily fluids.