The sister's mouth watered at the sight of her milf's engorged pussy, glistening with desire. She tentatively stuck out her tongue, licking the milf's slit, savoring the tangy taste. Encouraged by the milf's moans, she opened her mouth wider, taking in her sister's pulsing clit, sucking gently. The milf's hips moved in rhythm with her sister's eager mouth, her breath coming in ragged gasps as she brought herself closer to orgasm, her sister's warm, wet mouth driving her wild.