Frustration boils over as siblings, confined to their shared room, find themselves alone and horny. The brother, tired of jerking off to porn, turns to his sister, finding her similarly aroused. They lock eyes, and without a word, she straddles him on the bed, grinding her pussy against his hard cock through their clothes. He grips her ass, pulling her closer, as she moans softly, her hips moving in circular motions. She reaches between them, unbuttoning his jeans and freeing his throbbing dick. She strokes it slowly, her eyes never leaving his, before sliding down onto it, taking him deep inside her.