Stepbrother touches stepsister while she talks to stepmom

A stepbrother sneaks up behind his stepsister while she chats with their stepmom. His hands roam over her hips, causing her to jump and stifle a scream. She glances nervously at her stepmom, trying to act normal while he gropes her. Her breathing becomes shallow as he slides his hand further up her skirt. The tension is palpable as she fights the urge to push him away. A single drop of sweat rolls down her neck as she tries to maintain her composure.