Barely contained under a thin robe, the busty blonde sister sneaks into the bathroom, her eyes locked on the running shower. She peeks through the frosted glass, her breath hitching at the sight of her brother's muscular frame. Her hand wanders, stroking her ample breasts and dipping between her legs. The steam builds, mirroring her arousal as she watches him soaping up, his cock thickening with each pass of the washcloth.