As the rain pours, sisters huddle close, their bodies generating heat that transcends sibling warmth. The elder sister's breath tickles her younger sibling's ear, her voice a sultry whisper, "You're all wet." The younger sister blushes, her heart pounding as she feels her elder's hand on her thigh, inching upward. Their eyes lock, and the room spins. The elder sister's fingers find their way beneath the younger's skirt, stroking her wetness, making her gasp. They're teetering on the edge of a taboo they can't resist, their bodies aching for more as the storm outside mirrors their inner turmoil.