With the house to himself, he indulges in his forbidden desire, rubbing the soft fabric against his throbbing cock. The scent of her arousal drives him wild, and he jerks off furiously, his breaths coming in ragged gasps. He pictures her watching him, her eyes filled with lust as he pumps his cock with her panties. His body tenses, and he groans as he coats the delicate underwear with his hot, sticky cum.