The monsoon rains lash against the windows, echoing the sisters' inner turmoil. Thuy, the elder, has always been the responsible one, while Mai is a wild spirit, untamed and free. As they huddle together for warmth, Mai's leg entwines with Thuy's, her thigh pressing against Thuy's center. Thuy gasps, her body betraying her with a surge of heat. Mai grins, her eyes gleaming with mischief. 'You want me, don't you, sister?' she whispers. Thuy bites her lip, her silence speaking volumes. Mai takes her hand, guiding it beneath her nightgown, encouraging Thuy to feel the wetness between her legs. Thuy's fingers tentatively explore Mai's folds, her touch hesitant yet curious. Mai moans, her head falling back, as the sisters succumb to the storm raging within and without.