A special erogenous zone known as the "Spence gland," sometimes referred to as the G-spot of the breasts. A busty older sister, initially curious, tries out a trial massage course—only to find herself writhing in ecstasy from the intensely addictive sensations that surpass all expectations. With each thorough, careful kneading, she's naturally drawn closer to climax. Once this new door of sensation opens, there's no turning back. Her lower body grows wet—not from massage oil, but from her own overflowing arousal. Even during the final stage of treatment with a cock, the breast massage never stops. An unknown pleasure spreads from her tits throughout her entire body, tightening her chest with a sensation so intense that her shock and excitement never fade.