The shower's steam swirls around them, fogging the glass door, as the siblings succumb to their secret longing. The brother's eyes are locked onto his sister's lathered body, her nipples hard, her breath ragged. She leans in, her soapy hands wrapping around his throbbing cock, stroking it slowly. He groans, his hands finding her ass, pulling her closer. The water beats down on them, their bodies slick and slippery as they finally give in to the taboo pleasure they've both been denying.