Sofia and Karina, seemingly innocent siblings, find themselves drawn to each other's bodies, their desires awakening in the confines of their shared home. Sofia, the elder, discovers Karina masturbating in the bathroom, her petite frame quivering with pleasure. Instead of outrage, Sofia feels a spark of curiosity, her own loins moistening. They begin to explore each other's bodies, Sofia's fingers trailing along Karina's smooth skin, Karina's breath hitching as she feels her sister's touch. Their secret games escalate, their bodies entwined, until one day, they realize they've crossed an unspoken boundary.