Diana Grace, the innocent-looking step-sister, is lulled into a deep sleep by the hum of the AC. Her stepbrother, however, has other plans. Slipping into her room, he takes in her petite frame, clad only in a thin nightie. He can't resist the temptation to run his hands over her firm, young breasts, feeling her nipples harden at his touch. Diana stirs, and he quickly moves to her face, pressing his throbbing cock against her lips. She awakens, shocked, but the sight of his massive, veined cock sends a jolt of unexpected desire through her. She parts her lips, taking him in, as he slowly begins to mouth-fuck her, his hands tangled in her hair.