The brother, driven by lust, applies firm, slow strokes to his sister's back, his hands lingering on her shoulders, then sliding down her arms. She responds, her body writhing, her breath coming in short gasps. He leans in, his lips brushing her ear, "You're so tense, let me help you relax." She nods, her heart pounding. He moves to her legs, his hands massaging her calves, then her thighs, pushing her skirt up. She spreads her legs, inviting his touch. His fingers find her core, slippery with desire. She bites her lip, her hips moving in rhythm with his touch, as he expertly brings her to the brink of ecstasy.