In the depths of the pool, the siblings' taboo lust swells like the waves around them. She mounts him, his cock stretching her tight, virgin pussy as they grind together. He holds her close, their bodies slick with water and sweat, as she rides him hard. They explore each other's bodies, their hands and mouths insatiable, until they're both panting and ready to explode. They come together, their cries of pleasure filling the pool house, before quickly cleaning up and returning to their innocent facade.