Diana Grace and her petite step-sister, both curious and horny, decide to explore their mutual attraction in the privacy of their home. Their steamy session is interrupted when an undercover cop, responding to a noise complaint, knocks on their door. The girls, excited by the unexpected intrusion, invite him in, revealing their naked, entwined bodies. The cop, taken aback but aroused, joins their lesbian threesome, his massive cock pleasing both girls as they moan and orgasm together.