As the horror movie plays, Kimmy's stepsis can't keep her eyes on the screen. Instead, she's focused on the growing bulge in her brother's pants. Unable to resist, she reaches out, stroking him through the fabric. He tenses, then relaxes, letting her explore. She unzips him, pulling out his massive cock, and begins to pump her fist up and down, her thumb swirling around the head. He groans, his hips lifting off the couch. She leans down, taking him into her mouth, her head bobbing up and down as she struggles to take him all in. She's so turned on, she can't help but slip a hand into her own pants, fingering herself to the rhythm of her blowjob.