The creaking floorboards echo their forbidden rhythm as Roxy and Mi, bound by blood and desire, indulge in their secret tryst. Mi's mouth wraps around Roxy's stiff nipple, sucking and biting as Roxy's hand slides down Mi's stomach, finding her slick folds. Mi gasps, arching her back, as Roxy's fingers plunge into her depths. Roxy's other hand grips Mi's ass, pulling her tighter, their bodies slapping together in a frenzy. Mi's orgasm rips through her, a silent scream on her lips, as Roxy continues to thrust, drawing out her sister's pleasure until they collapse, panting, in a tangle of limbs and unspoken promises.